Home » Public Forums » GMCnet » [GMCnet] Onan, again.
| [GMCnet] Onan, again. [message #98502] |
Sat, 04 September 2010 09:59  |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Well here we sit at the Atlanta Nascar race. Been here since yesterday. Been running the Onan most of the time for A/C. After 12 additional hours on the Hobbs meter she up and quit. This is what happened in the fall last year and spring this year. Both times a new board from JimK fixed it. Looks like I need a supply of boards.
Question is what is killing the board? Ken H, I have the drawing where you added to the board to protect from spikes. Where can I get this modification done to the next inbound board/s?
George " just one repair away from running good" Zhookoff
78 EL II
Atlanta
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| Re: [GMCnet] Onan, again. [message #98535 is a reply to message #98502] |
Sat, 04 September 2010 15:56  |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Mike,
Jumped 9 to 6, start button works, runs when start is released, stop button works. If I use stop button to stop, I do not need to remove the jumper?
George
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sat Sep 04 12:46:13 2010
Subject: Re: [GMCnet] Onan, again.
George Zhookoff wrote on Sat, 04 September 2010 07:59
> Well here we sit at the Atlanta Nascar race. ... Been running the Onan most of the time ... she up and quit. ...
>
> Question is what is killing the board? ...
I do not know what is eating your boards. But AFTER you confirm the board is bad, AND everything else is good, you can get it running again....
Disclaimer: I would not run your Onan unattended with this work-a-round. This work-a-round by-passes the safety features of the board. It will NOT turn off power to the fuel pump and points if the motor stops for some reason other than the off switch. It also removes the low oil protections. Your results may vary and do not blame me! 8o
Find the lower pin 6. (It is normally not used.) Use a crimp on connector to jump it to the pin right next to it. (I am pretty sure it is pin 9.) The Onan should start and run normally. It should even stop when you press "off."
--
Mike Miller
`73 26' X Painted D.
`78 23' Birchaven
Hillsboro, OR
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| Re: [GMCnet] Onan, again. [message #98537 is a reply to message #98535] |
Sat, 04 September 2010 16:07 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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George,
My 4k in my Birchaven had the jumper when I bought the coach. I found it when doing other repairs. I think it has been jumped for years.
I DO plan on fixing it properly when I get to that point on my list. Until then I am very careful.
| George Zhookoff wrote on Sat, 04 September 2010 13:56 |
Mike,
Jumped 9 to 6, start button works, runs when start is released, stop button works. If I use stop button to stop, I do not need to remove the jumper?
|
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Onan, again. [message #98540 is a reply to message #98502] |
Sat, 04 September 2010 16:27 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Yes, I know what you mean. It just bugs me. Sure would like to know what's causing the problem. Just talked to Nick @ applied, new board headed my way!
George
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sat Sep 04 17:07:48 2010
Subject: Re: [GMCnet] Onan, again.
George,
My 4k in my Birchaven had the jumper when I bought the coach. I found it when doing other repairs. I think it has been jumped for years.
I DO plan on fixing it properly when I get to that point on my list. Until then I am very careful.
George Zhookoff wrote on Sat, 04 September 2010 13:56
> Mike,
> Jumped 9 to 6, start button works, runs when start is released, stop button works. If I use stop button to stop, I do not need to remove the jumper?
--
Mike Miller
`73 26' X Painted D.
`78 23' Birchaven
Hillsboro, OR
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| Re: [GMCnet] Onan, again. [message #98560 is a reply to message #98502] |
Sat, 04 September 2010 21:16 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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George,
CRS being what it is, and me 5 years or so past my last Onan, I don't
remember the details of that mod. I suspect I merely suggested (without
having ever done it ) that the relay coils on the board should have arc
suppression diodes across them. It's a trivial mod, using 'most any low
current silicon diodes, soldered onto the two ends of the coil. Position
the cathode (the end with the band or point) toward the end where the
positive voltage is applied when the relay is activated.
Thinking about it, I think I DID install the diode across the contacts of
the external relay (K1???).
I'll be glad to do the mod(s) for you at a rally if you remind me to bring a
small soldering iron and diodes -- but I can't guarantee that they'll do any
noticeable good -- it's just "good engineering practice" that I have seen
save some VERY valuable equipment. :-(
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sat, Sep 4, 2010 at 10:59 AM, George Zhookoff <gzhookoff@e2m.com> wrote:
> ...
Question is what is killing the board? Ken H, I have the drawing where you
> added to the board to protect from spikes. Where can I get this modification
> done to the next inbound board/s?
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan, again. [message #98565 is a reply to message #98502] |
Sat, 04 September 2010 21:24 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Ken,
Thanks for the reply. Nick called from Jimk's and asked if I could check the LOP switch. I'll check it when I'm back home after the races. I already have a new LOP in hand. I believe it's the board.
I intend to go to Pcola Dixielander rally. Went thru flight school there in 73. I'll give you a heads up as time grows closer.
George
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sat Sep 04 22:16:54 2010
Subject: Re: [GMCnet] Onan, again.
George,
CRS being what it is, and me 5 years or so past my last Onan, I don't
remember the details of that mod. I suspect I merely suggested (without
having ever done it ) that the relay coils on the board should have arc
suppression diodes across them. It's a trivial mod, using 'most any low
current silicon diodes, soldered onto the two ends of the coil. Position
the cathode (the end with the band or point) toward the end where the
positive voltage is applied when the relay is activated.
Thinking about it, I think I DID install the diode across the contacts of
the external relay (K1???).
I'll be glad to do the mod(s) for you at a rally if you remind me to bring a
small soldering iron and diodes -- but I can't guarantee that they'll do any
noticeable good -- it's just "good engineering practice" that I have seen
save some VERY valuable equipment. :-(
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sat, Sep 4, 2010 at 10:59 AM, George Zhookoff <gzhookoff@e2m.com> wrote:
> ...
Question is what is killing the board? Ken H, I have the drawing where you
> added to the board to protect from spikes. Where can I get this modification
> done to the next inbound board/s?
>
>
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| Re: [GMCnet] Onan, again. [message #98585 is a reply to message #98565] |
Sat, 04 September 2010 22:20 |
gene1
Messages: 50
Registered: February 2004
Location: Southern California
Karma: 0
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Member |
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George,
Went through flight training there in "52, time sure flies when you are
having fun. I'm living in San Diego, what about you?
Regards, Gene 76 Eleganza
----- Original Message -----
From: "George Zhookoff" <gzhookoff@e2m.com>
To: <gmclist@temp.gmcnet.org>
Sent: Saturday, September 04, 2010 7:24 PM
Subject: Re: [GMCnet] Onan, again.
> Ken,
> Thanks for the reply. Nick called from Jimk's and asked if I could check
> the LOP switch. I'll check it when I'm back home after the races. I
> already have a new LOP in hand. I believe it's the board.
>
> I intend to go to Pcola Dixielander rally. Went thru flight school there
> in 73. I'll give you a heads up as time grows closer.
>
> George
>
> ----- Original Message -----
> From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
> To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
> Sent: Sat Sep 04 22:16:54 2010
> Subject: Re: [GMCnet] Onan, again.
>
> George,
>
> CRS being what it is, and me 5 years or so past my last Onan, I don't
> remember the details of that mod. I suspect I merely suggested (without
> having ever done it ) that the relay coils on the board should have arc
> suppression diodes across them. It's a trivial mod, using 'most any low
> current silicon diodes, soldered onto the two ends of the coil. Position
> the cathode (the end with the band or point) toward the end where the
> positive voltage is applied when the relay is activated.
>
> Thinking about it, I think I DID install the diode across the contacts of
> the external relay (K1???).
>
> I'll be glad to do the mod(s) for you at a rally if you remind me to bring
> a
> small soldering iron and diodes -- but I can't guarantee that they'll do
> any
> noticeable good -- it's just "good engineering practice" that I have seen
> save some VERY valuable equipment. :-(
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI+ & EBL
> www.gmcwipersetc.com
>
>
>
> On Sat, Sep 4, 2010 at 10:59 AM, George Zhookoff <gzhookoff@e2m.com>
> wrote:
>
>> ...
>
> Question is what is killing the board? Ken H, I have the drawing where
> you
>> added to the board to protect from spikes. Where can I get this
>> modification
>> done to the next inbound board/s?
>>
>>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Onan, again. [message #98587 is a reply to message #98502] |
Sat, 04 September 2010 22:29 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
|
Senior Member |
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|
Gene,
Snellville, GA
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sat Sep 04 23:20:16 2010
Subject: Re: [GMCnet] Onan, again.
George,
Went through flight training there in "52, time sure flies when you are
having fun. I'm living in San Diego, what about you?
Regards, Gene 76 Eleganza
----- Original Message -----
From: "George Zhookoff" <gzhookoff@e2m.com>
To: <gmclist@temp.gmcnet.org>
Sent: Saturday, September 04, 2010 7:24 PM
Subject: Re: [GMCnet] Onan, again.
> Ken,
> Thanks for the reply. Nick called from Jimk's and asked if I could check
> the LOP switch. I'll check it when I'm back home after the races. I
> already have a new LOP in hand. I believe it's the board.
>
> I intend to go to Pcola Dixielander rally. Went thru flight school there
> in 73. I'll give you a heads up as time grows closer.
>
> George
>
> ----- Original Message -----
> From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
> To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
> Sent: Sat Sep 04 22:16:54 2010
> Subject: Re: [GMCnet] Onan, again.
>
> George,
>
> CRS being what it is, and me 5 years or so past my last Onan, I don't
> remember the details of that mod. I suspect I merely suggested (without
> having ever done it ) that the relay coils on the board should have arc
> suppression diodes across them. It's a trivial mod, using 'most any low
> current silicon diodes, soldered onto the two ends of the coil. Position
> the cathode (the end with the band or point) toward the end where the
> positive voltage is applied when the relay is activated.
>
> Thinking about it, I think I DID install the diode across the contacts of
> the external relay (K1???).
>
> I'll be glad to do the mod(s) for you at a rally if you remind me to bring
> a
> small soldering iron and diodes -- but I can't guarantee that they'll do
> any
> noticeable good -- it's just "good engineering practice" that I have seen
> save some VERY valuable equipment. :-(
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI+ & EBL
> www.gmcwipersetc.com
>
>
>
> On Sat, Sep 4, 2010 at 10:59 AM, George Zhookoff <gzhookoff@e2m.com>
> wrote:
>
>> ...
>
> Question is what is killing the board? Ken H, I have the drawing where
> you
>> added to the board to protect from spikes. Where can I get this
>> modification
>> done to the next inbound board/s?
>>
>>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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| Re: [GMCnet] Onan, again. [message #102443 is a reply to message #98535] |
Sun, 10 October 2010 19:12 |
pistolnut
Messages: 19
Registered: September 2010
Location: Caldwell, TX
Karma: 0
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Junior Member |
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| George Zhookoff wrote on Sat, 04 September 2010 15:56 |
Mike,
Jumped 9 to 6, start button works, runs when start is released, stop button works. If I use stop button to stop, I do not need to remove the jumper?
George
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sat Sep 04 12:46:13 2010
Subject: Re: [GMCnet] Onan, again.
George Zhookoff wrote on Sat, 04 September 2010 07:59
> Well here we sit at the Atlanta Nascar race. ... Been running the Onan most of the time ... she up and quit. ...
>
> Question is what is killing the board? ...
I do not know what is eating your boards. But AFTER you confirm the board is bad, AND everything else is good, you can get it running again....
Disclaimer: I would not run your Onan unattended with this work-a-round. This work-a-round by-passes the safety features of the board. It will NOT turn off power to the fuel pump and points if the motor stops for some reason other than the off switch. It also removes the low oil protections. Your results may vary and do not blame me! 
Find the lower pin 6. (It is normally not used.) Use a crimp on connector to jump it to the pin right next to it. (I am pretty sure it is pin 9.) The Onan should start and run normally. It should even stop when you press "off."
--
Mike Miller
`73 26' X Painted D.
`78 23' Birchaven
Hillsboro, OR
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I'm having the same kind of generator problems. My Onan runs while you are cranking it but dies when you let off the "start" button but it has a new board. I ran through all of the diagnostics and it looks like my DC voltage is just a hair too low. This seems to indicate I need to replace the voltage regulator. I want to bypass until I can replace the regulator. When I jump from 9 to 5 to make the Onan run, my A/C output is good, I have it set at 128V. I tried the 9 to 6 jumper shown above but my starter remains engaged after the engine fires. If I flip the rocker back to stop the starter releases but the generator also stops. Is there a way to bypass the board and retain the inside switch function?
'76 Birchaven
Caldwell, TX
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| Re: [GMCnet] Onan, again. [message #102447 is a reply to message #102443] |
Sun, 10 October 2010 20:07 |
|
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
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| pistolnut wrote on Sun, 10 October 2010 17:12 |
...I'm having the same kind of generator problems. My Onan runs while you are cranking it but dies when you let off the "start" button but it has a new board. I ran through all of the diagnostics and it looks like my DC voltage is just a hair too low. This seems to indicate I need to replace the voltage regulator. I want to bypass until I can replace the regulator. When I jump from 9 to 5 to make the Onan run, my A/C output is good, I have it set at 128V. I tried the 9 to 6 jumper shown above but my starter remains engaged after the engine fires. If I flip the rocker back to stop the starter releases but the generator also stops. Is there a way to bypass the board and retain the inside switch function?
|
I am on the road right now so I do not have access to my notes.
BUT...
IIRC: You can just disconnect the voltage regulator (unless you have an early coach AND still have the dedicated Onan staring battery.) I have seen the voltage regulator with two and three wires. If two, just disconnect and tape up the connectors. If three, find the two that are normally connected electrically... keep them connected to each other when you tape them up.
Background notes: The engine used on our generators have been used in many other applications. There is an alternator under the flywheel that has two functions. (as designed) 1. It provides an "engine running" signal (AC voltage) to the control board. 2. It provides for recharging the battery. IE: The board rectifies this AC signal and sends it to recharge the starting battery. It is regulated by the voltage regulator. As MOST of the GMC's do NOT have a dedicated Onan starting battery, the regulator is not really needed.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Onan, again. [message #102453 is a reply to message #102443] |
Sun, 10 October 2010 20:10 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Clint,
When you refer to low DC voltage and to the voltage regulator, I presume
you're talking about the heat sinked regulator at the upper forward side of
the Onan. Unless you have a (non-OEM) dedicated battery for the Onan, that
regulator should be disconnected. To do so, disconnect and tape up each of
the two Fast-on connectors separately (one of them will probably be a
two-wire connection).
There are two purposes for the Onan's flywheel alternator: The most
important is to provide 26-30 vac to pin 8 of the control board to "notify"
the system that the engine's running. The second is to provide 8 A charge
current, controlled by the mentioned voltage regulator, for a dedicated
battery. It is possible for the regulator to malfunction and pull down the
needed 26-30 vac. Thus the reason to disconnect it.
If that does not restore the 26-30 vac, and the resultant DC "running
signal" to the coil of K2, then it's probably time to pull the flywheel and
check the condition of the alternator coil concealed there. (But K2 should
close with only 10-12 VDC on its coil.)
HTH,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sun, Oct 10, 2010 at 8:12 PM, Clint Arnett <pistolnut@gmail.com> wrote:
>
> ...I'm having the same kind of generator problems. My Onan runs while you
> are cranking it but dies when you let off the "start" button but it has a
> new board. I ran through all of the diagnostics and it looks like my DC
> voltage is just a hair too low. This seems to indicate I need to replace the
> voltage regulator. I want to bypass until I can replace the regulator...
> When I jump from 9 to 5 to make the Onan run, my A/C output is good, I have
> it set at 128V. I tried the 9 to 6 jumper shown above but my starter remains
> engaged after the engine fires. If I flip the rocker back to stop the
> starter releases but the generator also stops. Is there a way to bypass the
> board and retain the inside switch function?
> --
> '76 Birchaven
> Caldwell, TX
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan, again. [message #102462 is a reply to message #98502] |
Sun, 10 October 2010 20:46 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
|
Senior Member |
|
|
Clint,
I puit on a new board and all is well, sort of. I've already disabled the regulator per Mr Onan's DVD.
My problem now is the massive oil leak out the bottom shroud. Installed new gasket for oil filter, no leaks there. I guess it's the main seal behind the flywheel. I checked the manuals but there's no number called out for the seal. Anybody know the number for the front shaft seal behind the flywheel? 6 KW.
Thanks
George Zhookoff
78 EL II
Atlanta
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
Sent: Sun Oct 10 21:10:18 2010
Subject: Re: [GMCnet] Onan, again.
Clint,
When you refer to low DC voltage and to the voltage regulator, I presume
you're talking about the heat sinked regulator at the upper forward side of
the Onan. Unless you have a (non-OEM) dedicated battery for the Onan, that
regulator should be disconnected. To do so, disconnect and tape up each of
the two Fast-on connectors separately (one of them will probably be a
two-wire connection).
There are two purposes for the Onan's flywheel alternator: The most
important is to provide 26-30 vac to pin 8 of the control board to "notify"
the system that the engine's running. The second is to provide 8 A charge
current, controlled by the mentioned voltage regulator, for a dedicated
battery. It is possible for the regulator to malfunction and pull down the
needed 26-30 vac. Thus the reason to disconnect it.
If that does not restore the 26-30 vac, and the resultant DC "running
signal" to the coil of K2, then it's probably time to pull the flywheel and
check the condition of the alternator coil concealed there. (But K2 should
close with only 10-12 VDC on its coil.)
HTH,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sun, Oct 10, 2010 at 8:12 PM, Clint Arnett <pistolnut@gmail.com> wrote:
>
> ...I'm having the same kind of generator problems. My Onan runs while you
> are cranking it but dies when you let off the "start" button but it has a
> new board. I ran through all of the diagnostics and it looks like my DC
> voltage is just a hair too low. This seems to indicate I need to replace the
> voltage regulator. I want to bypass until I can replace the regulator...
> When I jump from 9 to 5 to make the Onan run, my A/C output is good, I have
> it set at 128V. I tried the 9 to 6 jumper shown above but my starter remains
> engaged after the engine fires. If I flip the rocker back to stop the
> starter releases but the generator also stops. Is there a way to bypass the
> board and retain the inside switch function?
> --
> '76 Birchaven
> Caldwell, TX
> _______________________________________________
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>
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| Re: [GMCnet] Onan, again. [message #102469 is a reply to message #102462] |
Sun, 10 October 2010 21:21 |
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Hardie Johnson
Messages: 483
Registered: January 2004
Location: Raleigh NC
Karma: 0
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Senior Member |
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| George Zhookoff wrote on Sun, 10 October 2010 21:46 |
Clint,
I puit on a new board and all is well, sort of. I've already disabled the regulator per Mr Onan's DVD.
My problem now is the massive oil leak out the bottom shroud. Installed new gasket for oil filter, no leaks there. I guess it's the main seal behind the flywheel. I checked the manuals but there's no number called out for the seal. Anybody know the number for the front shaft seal behind the flywheel? 6 KW.
Thanks
George Zhookoff
78 EL II
Atlanta
<>
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George, when I had that issue I measured the seal and went to Bearings Inc, or a similar industrial supply house and got the replacement very cheap.
"take two, they're small"
Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC
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| Re: [GMCnet] Onan, again. [message #102492 is a reply to message #102469] |
Sun, 10 October 2010 23:23 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Senior Member |
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George,
I just did some work on mine, and ordered the seal from jackssmallengines.com, and they had them in stock. Took a while to get as the brush springs I ordered with them were back ordered and they shipped them all together.
2 GASKET OIL FLTR ADPT part # ON1220771 $5.74
1 SEAL OIL TEXT part # ON5090040 $6.28
The bottom # is the crank oil seal, the top one is the good one for the oil filter adapter. As someone else on the board mentioned, there are actually 2 gaskets, one nearest the adapter, and one between a long 1/4" by 2" or so steel bar that runs vertically the height of the engine, and then curves to attach to the engine mount at the top. A giant PITA to get that 2nd gasket off and back on. There was so much oil around I couldn't tell where it was leaking from, so I changed the pressure switch as well, which many people report leaking. Unfortunately, I could not get my flywheel off to change the crank seal, but fortunately, I don't think it's leaking there. If anyone has any great ideas for getting the flywheel off, that would be helpful. I used a pretty heavy duty SnapOn puller and did as much tightening and pounding as I dared, but ran out of patience before I got it off. I did loosen but not remove the flywheel bolt, and I think that put too much monkey motion in the puller. I may try again in the spring without the bolt, but using wire or rope to catch the flywheel from flying when it comes off.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Onan, again. [message #102512 is a reply to message #98535] |
Mon, 11 October 2010 06:57 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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George,
That jumper actually eliminates the board. It also eliminates the LOP
protection the board offers. If you are sitting, and the oil sump is at the
proper level and from history, you are sure the unit does not consume or
leak oil, I would not hesitate to let it run.
On Sat, Sep 4, 2010 at 1:56 PM, George Zhookoff <gzhookoff@e2m.com> wrote:
> Mike,
> Jumped 9 to 6, start button works, runs when start is released, stop button
> works. If I use stop button to stop, I do not need to remove the jumper?
> George
>
> ----- Original Message -----
> From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
> To: gmclist@temp.gmcnet.org <gmclist@temp.gmcnet.org>
> Sent: Sat Sep 04 12:46:13 2010
> Subject: Re: [GMCnet] Onan, again.
>
>
>
> George Zhookoff wrote on Sat, 04 September 2010 07:59
> > Well here we sit at the Atlanta Nascar race. ... Been running the Onan
> most of the time ... she up and quit. ...
> >
> > Question is what is killing the board? ...
>
>
> I do not know what is eating your boards. But AFTER you confirm the board
> is bad, AND everything else is good, you can get it running again....
>
> Disclaimer: I would not run your Onan unattended with this work-a-round.
> This work-a-round by-passes the safety features of the board. It will NOT
> turn off power to the fuel pump and points if the motor stops for some
> reason other than the off switch. It also removes the low oil protections.
> Your results may vary and do not blame me! 8o
>
> Find the lower pin 6. (It is normally not used.) Use a crimp on connector
> to jump it to the pin right next to it. (I am pretty sure it is pin 9.)
> The Onan should start and run normally. It should even stop when you press
> "off."
>
>
> --
> Mike Miller
> `73 26' X Painted D.
> `78 23' Birchaven
> Hillsboro, OR
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
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> _______________________________________________
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>
--
Steve Ferguson
Sierra Vista, AZ
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