| Early Onan ignition points part number [message #284652] |
Wed, 12 August 2015 08:19  |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
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I cant find my GMCMHI partsbook.
Can someone please direct me to Onan points part number. Early 1976- the one that requires a mirror to see.
I'm going to a Cummins/Onan shop today. I can't read the model or serial # on the onan to give them correct info.
Thanks
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: Early Onan ignition points part number [message #284672 is a reply to message #284652] |
Wed, 12 August 2015 10:10  |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
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From the 78 Z parts book if it helps Page 28-79
707218 Point Set-breaker (W/out 2010790 gen. assy.)
2017788 Point assy. Breaker Box (W/2010790 gen. assy.)
hope this helps.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
[Updated on: Wed, 12 August 2015 10:14] Report message to a moderator |
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| Re: [GMCnet] Early Onan ignition points part number [message #284674 is a reply to message #284652] |
Wed, 12 August 2015 10:22 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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Gene,
Why would you want to replace the old style when the later style is so much
easier to adjust? That innocent question without even trying to convince
you to go to the MUCH better (and probably cheaper) flywheel-driven
Pertronix mod. :-)
Ken H.
On Wed, Aug 12, 2015 at 9:19 AM, gene barrow wrote:
> I cant find my GMCMHI partsbook.
>
> Can someone please direct me to Onan points part number. Early 1976- the
> one that requires a mirror to see.
>
> I'm going to a Cummins/Onan shop today. I can't read the model or serial #
> on the onan to give them correct info.
>
> Thanks
>
>
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
>
> _______________________________________________
> GMCnet mailing list
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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] Early Onan ignition points part number [message #284724 is a reply to message #284674] |
Wed, 12 August 2015 18:46 |
Jim Miller
Messages: 501
Registered: March 2008
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On Aug 12, 2015, at 11:22 AM, Ken Henderson wrote:
> Why would you want to replace the old style when the later style is so much easier to adjust?
There are two fundamentally different and incompatible points systems found on the Onans. One has the points located on the vertical wall of a metal box with a side-access cover plate and the other design has the points mounted on the block with an aluminum access cover over top of everything. You cannot interchange parts between the two (other than perhaps the condenser).
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Early Onan ignition points part number [message #284735 is a reply to message #284730] |
Wed, 12 August 2015 22:11 |
Jim Miller
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Registered: March 2008
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Hi Rob,
Does Jim provide a cover to go along with the assembly you referenced?
The early points are situated in a metal box that has a removable side cover for access. The points you linked to are a design that does not use the box and has a different type of cover to keep everything isolated from the environment. The two aren’t compatible; I learned this from experience this since I have 6 Onans of different vintages and have had to deal with both types of systems when repairing these units.
I know where you are coming from with the smacked pertronix. In my case I had fabricated an ultra-rigid pertronix mount - so rigid that the wind from the flywheel caused the pertronix to vibrate enough that its aluminum mounting tab fatigued and broke in half after 45 hours of operation. It took some shots from the flywheel but is still electrically functional.
Retaining the points after a pertronix upgrade is a great idea - it saved my bacon just a couple of weeks ago. In my case I'm installing a switch to make it easy to choose between the two without having to make wiring changes.
—Jim
> On Aug 12, 2015, at 9:03 PM, Robert Mueller wrote:
>
> Jim,
>
> It should be noted that the later complete points assembly can be used to replace the early model that SUCKS!
>
> JimK sells them: http://www.appliedgmc.com/prod.itml/icOid/1335
>
> JimB gave me a set off a late model in his Onan grave yard.
>
> Ken Broostin (worked for Onan back in the day) and gave a presentation on them at a couple of GMCMI Conventions noted that the Onan
> in our GMC's was an adaptation of one that already existed and used in stationary generators which allowed access from the "back"
> side.
>
> I installed a Pertronics flywheel system in Double Trouble but retained the OEM setup as a backup. That paid off when the flywheel
> smacked the pickup because dumb a$$ put it too close!
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Early Onan ignition points part number [message #284741 is a reply to message #284735] |
Wed, 12 August 2015 23:45 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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While in an Onan thread: Another bridge rectifier bit the dust last week.
A friend called that he had a hot ride home through GA heat because the
Onan quit. He reported that he couldn't push in the CB on the Onan, so I
had him check the input voltage -- NADA. When he finally got the bridge
rectifier out, the terminal turned in the connector block, and his spare
rectifier installed, all's good again. I was holding my breath until he
called back, thinking he might have to call Jim. :-)
If you don't carry a spare bridge rectifier, you should. it's not that
difficult to install and is probably the most frequent cause of "No 120
vac". I usually have 25A 400+VDC bridges with me at rallies since I used
them in the electric wiper wiring harnesses. The wipers don't need
anywhere near those high ratings but the cost differential is so little
that I just use them, giving every electric wiper owner an on-board Onan
spare (providing it doesn't rain at the same time).
Ken H.
On Wed, Aug 12, 2015 at 11:11 PM, Jim Miller wrote:
> ...
>
> Retaining the points after a pertronix upgrade is a great idea - it saved
> my bacon just a couple of weeks ago. In my case I'm installing a switch to
> make it easy to choose between the two without having to make wiring
> changes.
>
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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] Early Onan ignition points part number [message #284746 is a reply to message #284741] |
Thu, 13 August 2015 06:07 |
Jim Miller
Messages: 501
Registered: March 2008
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On Aug 13, 2015, at 12:45 AM, Ken Henderson wrote:
> If you don't carry a spare bridge rectifier, you should. it's not that difficult to install and is probably the most frequent cause of "No 120 vac". I usually have 25A 400+VDC bridges with me at rallies since I used them in the electric wiper wiring harnesses.
Great point Ken; new bridges are inexpensive and are good insurance against a spoiled trip.
Did your friend’s Onan have the original bridge installed or had he replaced it previously?
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Early Onan ignition points part number [message #284758 is a reply to message #284735] |
Thu, 13 August 2015 08:09 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Jim,
The photo in JimK's catalog shows only the points, bracket, and condenser as a guess I'd say it doesn't come with a cover.
JimB gave me the whole shebang, including the cover.
Regards,
Rob M.
-----Original Message-----
From: Jim Miller
Hi Rob,
Does Jim provide a cover to go along with the assembly you referenced?
The early points are situated in a metal box that has a removable side cover for access. The points you linked to are a design that
does not use the box and has a different type of cover to keep everything isolated from the environment. The two aren't compatible;
I learned this from experience this since I have 6 Onans of different vintages and have had to deal with both types of systems when
repairing these units.
I know where you are coming from with the smacked pertronix. In my case I had fabricated an ultra-rigid pertronix mount - so rigid
that the wind from the flywheel caused the pertronix to vibrate enough that its aluminum mounting tab fatigued and broke in half
after 45 hours of operation. It took some shots from the flywheel but is still electrically functional.
Retaining the points after a pertronix upgrade is a great idea - it saved my bacon just a couple of weeks ago. In my case I'm
installing a switch to make it easy to choose between the two without having to make wiring changes.
-Jim
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Early Onan ignition points part number [message #284759 is a reply to message #284758] |
Thu, 13 August 2015 08:19 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Aug 13, 2015, at 9:09 AM, Robert Mueller wrote:
> The photo in JimK's catalog shows only the points, bracket, and condenser as a guess I'd say it doesn't come with a cover.
>
> JimB gave me the whole shebang, including the cover.
Hi Rob,
If it doesn’t come with a cover then it cannot be used as a retrofit for the old style enclosed-in-a-box points. You’d have to fabricate your own cover and if you were going to do that then you might as well install a pertronix and leave the old points in place as a backup. I love my pertronix but I find comfort in knowing the points are still there if I need them in an emergency.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Early Onan ignition points part number [message #284774 is a reply to message #284746] |
Thu, 13 August 2015 10:06 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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JIm,
I presume it was original because he had no idea how to replace it and had
to modify the connector.
Claims they didn't shut down with the A/C going.
Ken H.
On Thu, Aug 13, 2015 at 7:07 AM, Jim Miller wrote:
> On Aug 13, 2015, at 12:45 AM, Ken Henderson
> wrote:
>> If you don't carry a spare bridge rectifier, you should. it's not that
> difficult to install and is probably the most frequent cause of "No 120
> vac". I usually have 25A 400+VDC bridges with me at rallies since I used
> them in the electric wiper wiring harnesses.
>
> Great point Ken; new bridges are inexpensive and are good insurance
> against a spoiled trip.
>
> Did your friend’s Onan have the original bridge installed or had he
> replaced it previously?
>
>
> --Jim "saving the lives of Onans...one unit at a time" Miller
> 1977 Eleganza II
> 1977 Royale
> Hamilton, OH
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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