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[GMCnet] Onan Question [message #279520]

Wed, 10 June 2015 13:23

Arthur Mansfield

Messages: 290
Registered: April 2010

Karma: 0

Senior Member

All I know for sure is there is oil going all over the place when I run the generator. I have pulled the fly wheel. The coils that are in the fly wheel do not have any oil on them.

Need to replace the pressure switch while I have the fly wheel off. Is this a special pressure switch?

I need to remove the crank shaft seal. How is the best way to remove the seal.

Art & Doris
Decatur AL
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Re: [GMCnet] Onan Question [message #279525 is a reply to message #279520]

Wed, 10 June 2015 14:37

powerjon

Messages: 2446
Registered: January 2004

Karma: 5

Senior Member

Your leak is probably the oil pressure switch or the oil filter mount. DO NOT change the crank seal if it is not leaking. If it ain’t Broke Don’t Fix it.

JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCGL Tech Editor
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan

> On Jun 10, 2015, at 2:23 PM, 1104agm wrote:
>
> All I know for sure is there is oil going all over the place when I run the generator. I have pulled the fly wheel. The coils that are in the fly wheel do not have any oil on them.
>
> Need to replace the pressure switch while I have the fly wheel off. Is this a special pressure switch?
>
> I need to remove the crank shaft seal. How is the best way to remove the seal.
>
> Art & Doris
> Decatur AL
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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Re: [GMCnet] Onan Question [message #279562 is a reply to message #279520]

Wed, 10 June 2015 20:25

A Hamilto

Messages: 4508
Registered: April 2011

Karma: 39

Senior Member

Arthur Mansfield wrote on Wed, 10 June 2015 13:23

...Need to replace the pressure switch while I have the fly wheel off. Is this a special pressure switch?...

I don't know. If in doubt, buy from Jim K.

http://www.appliedgmc.com/prod.itml/icOid/985

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Re: [GMCnet] Onan Question [message #279566 is a reply to message #279520]

Wed, 10 June 2015 21:08

Bruce Hart

Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming

Karma: 5

Senior Member

Found this in my notes:
ONAN OIL PRESSURE SWITCH
Wells PS117. PS117 is 3 to 5 PSI, Normally Closed, but check the
threads and electrical connector closely with the old one to be sure it is
the same thing.

AZ PS117,
NAPA OP6282, OP6075, OP6074,
Car Quest PF120,
Borg Warner S310.

On Wed, Jun 10, 2015 at 12:23 PM, 1104agm wrote:

> All I know for sure is there is oil going all over the place when I run
> the generator. I have pulled the fly wheel. The coils that are in the fly
> wheel do not have any oil on them.
>
> Need to replace the pressure switch while I have the fly wheel off. Is
> this a special pressure switch?
>
> I need to remove the crank shaft seal. How is the best way to remove the
> seal.
>
> Art & Doris
> Decatur AL
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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Re: [GMCnet] Onan Question [message #279568 is a reply to message #279520]

Wed, 10 June 2015 21:25

Tilerpep

Messages: 404
Registered: June 2013
Location: Raleigh, NC

Karma: 7

Senior Member

Just pulled my flywheel to mess with starter bracket and leak. Leak was totally from oil pressure sender. It would get worse when hot and it was a LOT of oil. Barely a drip when start it up. Use a distributor wrench to tighten the two bolts that hold the plate the sender is on to the block.

1975 Glenbrook, 1978 Royale rear bath Raleigh, NC

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Re: [GMCnet] Onan Question [message #279573 is a reply to message #279568]

Wed, 10 June 2015 21:52

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

Please don't ask how I know this but: make sure your oil filter is tight.

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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Re: [GMCnet] Onan Question [message #279582 is a reply to message #279573]

Thu, 11 June 2015 01:41

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

I did the same thing. Bought the seal. When I took off the flywheel it was obvious that the seal was not the problem. It was the bolts look that hold the oil filter adapter and pressure switch. Tighten the adapter and hose the are down with brake cleaner. If it still leaks replace the oil pressure switch. They are cheap and usually in stock at AZ.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] Onan Question [message #279584 is a reply to message #279582]

Thu, 11 June 2015 05:17

Arthur Mansfield

Messages: 290
Registered: April 2010

Karma: 0

Senior Member

Thanks everyone. I will do all the checks mentioned and replace the pressure switch reassemble and see it it still leaks before pulling the seal.
On Jun 11, 2015, at 1:41 AM, Ken Burton wrote:

> I did the same thing. Bought the seal. When I took off the flywheel it was obvious that the seal was not the problem. It was the bolts look that
> hold the oil filter adapter and pressure switch. Tighten the adapter and hose the are down with brake cleaner. If it still leaks replace the oil
> pressure switch. They are cheap and usually in stock at AZ.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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[GMCnet] All were not real tight [message #279640 is a reply to message #279582]

Thu, 11 June 2015 14:37

Arthur Mansfield

Messages: 290
Registered: April 2010

Karma: 0

Senior Member

Well I got the sensor out. The 90 the sensor is mounted was loose. The bolts that hold the oil filter adapter were loose. I have not yet gotten the a adapter off as it is glued on. My back said it was time to take a brake.

Is it normal to have the 90 to mount the sensor.

I have cleaned the oil off off most of the generator. The coils for the generator were basically oil free so I assume the oil was from the filter, the adapter, the 90 degree or sensor. One or all could have been the source of the oil. Once I get the adapter off I will tighten the 90 degree adapter and then put it back together. Run it a few minutes and pull the flywheel again and check for oil leaks.

I do not know why I am fixing the generator as I can not use it driving. It runs for about a half hour or so and quits. Sit still it will run all day without a problem while running a AC. I have even run both AC for a while without a problem. When we lost power I hooked it to the house and it ran all day. We never park except were we can hook up to power.

I guess something does not like heat. Changed out the coil from another one and it did the same thing.

Mine has a different fuel pump and filter as the other had gave up and quit.

Art
On Jun 11, 2015, at 1:41 AM, Ken Burton wrote:

> I did the same thing. Bought the seal. When I took off the flywheel it was obvious that the seal was not the problem. It was the bolts look that
> hold the oil filter adapter and pressure switch. Tighten the adapter and hose the are down with brake cleaner. If it still leaks replace the oil
> pressure switch. They are cheap and usually in stock at AZ.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: [GMCnet] Onan Question [message #279647 is a reply to message #279582]

Thu, 11 June 2015 15:37

Arthur Mansfield

Messages: 290
Registered: April 2010

Karma: 0

Senior Member

Well the filter adapter does not want to come off. I guess I will leave it on and put the 90 adapter with blue loctite and the sensor.
On Jun 11, 2015, at 1:41 AM, Ken Burton wrote:

> I did the same thing. Bought the seal. When I took off the flywheel it was obvious that the seal was not the problem. It was the bolts look that
> hold the oil filter adapter and pressure switch. Tighten the adapter and hose the are down with brake cleaner. If it still leaks replace the oil
> pressure switch. They are cheap and usually in stock at AZ.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: [GMCnet] Onan Question [message #279653 is a reply to message #279582]

Thu, 11 June 2015 17:04

Arthur Mansfield

Messages: 290
Registered: April 2010

Karma: 0

Senior Member

After letting the loctite set I put the fly wheel on and without the covers and started it. I ran it for a few minute with no oil leaks. It ran as long as it did when it dropped the oil. Was afraid to run it to long with out the covers and therefore no cooling air.

Tomorrow I will put the fly wheel tomorrow to check inside it and if clean I will completely reassemble the generator. I will wire brush the heads to get the scale off of the heads to help the cooling.

Thanks for your help.

Art
On Jun 11, 2015, at 1:41 AM, Ken Burton wrote:

> I did the same thing. Bought the seal. When I took off the flywheel it was obvious that the seal was not the problem. It was the bolts look that
> hold the oil filter adapter and pressure switch. Tighten the adapter and hose the are down with brake cleaner. If it still leaks replace the oil
> pressure switch. They are cheap and usually in stock at AZ.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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Re: [GMCnet] All were not real tight [message #279663 is a reply to message #279640]

Thu, 11 June 2015 18:43

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

Art,

Your signature block doesn't include the important information about what
model GMC you have. But, based on your Onan symptoms, I'm guessing it's a
Coachmen-built model (Royale or Birchaven), or another "aftermarket
upfitter" built one. Why? Because those did not use the independent fuel
pickup in the main (rear) tank. Rather, they tee'd into the engine feed
hose for the Onan's supply. That opens the possibility of the engine fuel
pump starving the Onan's pump.

As a test, try running on the Aux tank to see if the Onan shutdown problem
persists. If so, forget this idea. :-)

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com

On Thu, Jun 11, 2015 at 3:37 PM, 1104agm wrote:

> ...
>
> I do not know why I am fixing the generator as I can not use it driving.
> It runs for about a half hour or so and quits. Sit still it will run all
> day without a problem while running a AC. I have even run both AC for a
> while without a problem. When we lost power I hooked it to the house and
> it ran all day. We never park except were we can hook up to power.
> ...
>
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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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