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Onan Repair [message #165723]

Sun, 08 April 2012 10:12

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma:

Senior Member

My GMC project for this weekend has been fixing some oil leaks on my Onan. While replacing the LOP switch a few months ago, I noticed an apparent leak at the oil filter adapter. I stopped by my local Cummins/Onan repair center (Simonsen Generator Service, here in Tucson), and picked up the necessary gaskets. The owner, Eric Simonsen, recognized that the generator was a GMC Power Drawer from the 6.0 in the model number. He said that the other NH series Onans were rated at 6.5 KW, and the Power Drawer lost about 500 watts worth of horsepower to the flat intake manifold. I also asked him about the sealing ring around the oil filter and he said it is very important to have that in place for proper cooling, especially at full or near full load. Without that rubber ring, air is drawn in around the oil filter and bypasses the cooling fins on the adjacent head. I bought a new one of those too.

Eric told me I would need two gaskets for the oil filter adapter, since the mounting strap for the engine goes down between the engine block and the adapter. He said that the bottom nut is hard to get at and he used a distributor wrench to get at it. It worked very well. I had to disassemble the upper right mount and remove the mounting strap to replace the gasket behind it. After replacing those two gaskets, with the generator supported on a jack, I decided to remove the oil pan.

After reading Rob M's report of how expensive a new oil pan gasket is, I decided to try to remove the pan cleanly, try to separate the old gasket from the pan. and reuse it with a thin coat of RTV on both sides. So far, this strategy seems to be working, as I was able to remove the gasket, a rather robust rubber piece, without damage. I cleaned it and am currently soaking the pan and bolts in my parts washer. I hope to put it back together today sometime after the family Easter festivities.

I still need to find a proper sealing gasket/ring for the oil plug, which also had a small drip. Hopefully I will be able to take the plug to my auto parts store tomorrow and have them match one up to it.

I also plan to adjust the tappets. I was told that they could be adjusted with the engine running, but Eric said that is not possible, since the intake manifold needs to come off in order to gain access to the tappet covers. Upon looking at the top f the engine, I'm guessing he's right. I will take the manifold off and adjust the tappets cold as he suggested. Hopefully all this will make my Onan run a bit smoother. I de-carboned the heads when I first got the Motorhome three and a half years ago.

Have a Happy Easter!

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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[Message index]

		Onan Repair By: Carl S. on Sun, 08 April 2012 10:12
		Re: [GMCnet] Onan Repair By: Ken Henderson on Sun, 08 April 2012 10:38
		Re: Onan Repair By: Matt Colie on Sun, 08 April 2012 13:55
		Re: Onan Repair By: Carl S. on Sun, 08 April 2012 15:02
		Re: Onan Repair By: Dennis S on Sun, 08 April 2012 21:03
		Re: Onan Repair By: Carl S. on Sun, 08 April 2012 21:37
		Re: Onan Repair By: tphipps on Mon, 09 April 2012 09:26
		Re: Onan Repair By: Ken Burton on Mon, 09 April 2012 22:42
		Re: Onan Repair By: Carl S. on Tue, 10 April 2012 13:47
		Re: Onan Repair By: Dennis S on Tue, 10 April 2012 13:50
		Re: Onan Repair By: Carl S. on Tue, 10 April 2012 14:17
		Re: Onan Repair By: Dennis S on Tue, 10 April 2012 14:27
		Re: [GMCnet] Onan Repair By: mickeysss on Tue, 10 April 2012 14:32
		Re: [GMCnet] Onan Repair By: Carl S. on Tue, 10 April 2012 20:28
		Re: [GMCnet] Onan Repair By: mickeysss on Fri, 27 April 2012 01:04
		Re: Onan Repair By: tphipps on Tue, 10 April 2012 14:23
		Re: Onan Repair By: Carl S. on Tue, 10 April 2012 20:22
		Re: Onan Repair By: mike miller on Tue, 10 April 2012 20:54
		Re: [GMCnet] Onan Repair By: Mr ERFisher on Tue, 10 April 2012 22:09
		Re: [GMCnet] Onan Repair By: Carl S. on Tue, 10 April 2012 22:14
		Re: [GMCnet] Onan Repair By: Carl S. on Tue, 24 April 2012 13:25
		Re: [GMCnet] Onan Repair By: ljdavick on Tue, 24 April 2012 18:47
		Re: [GMCnet] Onan Repair By: Carl S. on Tue, 24 April 2012 19:11
		Re: [GMCnet] Onan Repair By: USAussie on Tue, 24 April 2012 20:40
		Re: [GMCnet] Onan Repair By: Carl S. on Tue, 24 April 2012 21:03
		Re: [GMCnet] Onan Repair By: tphipps on Tue, 24 April 2012 14:46
		Re: [GMCnet] Onan Repair By: Mr ERFisher on Tue, 24 April 2012 15:10
		Re: [GMCnet] Onan Repair By: mickeysss on Tue, 24 April 2012 17:59
		Re: [GMCnet] Onan Repair By: USAussie on Tue, 24 April 2012 18:03
		Re: [GMCnet] Onan Repair By: mickeysss on Tue, 24 April 2012 18:10
		Re: [GMCnet] Onan Repair By: mickeysss on Tue, 24 April 2012 18:13
		Re: [GMCnet] Onan Repair By: USAussie on Tue, 24 April 2012 18:19
		Re: [GMCnet] Onan Repair By: storm'n on Tue, 24 April 2012 18:23
		Re: [GMCnet] Onan Repair By: ljdavick on Tue, 24 April 2012 18:35
		Re: [GMCnet] Onan Repair By: ljdavick on Tue, 24 April 2012 11:52
		Re: [GMCnet] Onan Repair By: mike miller on Tue, 24 April 2012 12:18
		Re: [GMCnet] Onan Repair By: ljdavick on Tue, 24 April 2012 19:27
		Re: [GMCnet] Onan Repair By: Matt Colie on Tue, 24 April 2012 21:23
		Re: [GMCnet] Onan Repair By: mike miller on Wed, 25 April 2012 00:08
		Re: [GMCnet] Onan Repair By: mike miller on Wed, 25 April 2012 01:09
		Re: [GMCnet] Onan Repair By: mike miller on Wed, 25 April 2012 01:18
		Re: [GMCnet] Onan Repair By: ljdavick on Wed, 25 April 2012 01:34
		Re: [GMCnet] Onan Repair By: USAussie on Tue, 24 April 2012 16:41
		Re: [GMCnet] Onan Repair By: powerjon on Tue, 24 April 2012 16:47
		Re: [GMCnet] Onan Repair By: Ken Henderson on Tue, 24 April 2012 17:13
		Re: [GMCnet] Onan Repair By: USAussie on Tue, 24 April 2012 17:35
		Re: Onan Repair By: Bob de Kruyff on Tue, 10 April 2012 17:11
		Re: Onan Repair By: JohnL455 on Tue, 10 April 2012 18:07
		Re: [GMCnet] Onan Repair By: jhbridges on Wed, 11 April 2012 06:44

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