GMCforum: GMCnet » ONAN Head Experience

Home » Public Forums » GMCnet » ONAN Head Experience

Show: Today's Messages :: Polls :: Message Navigator

ONAN Head Experience [message #254788]

Tue, 08 July 2014 23:52

captjack

Messages: 271
Registered: February 2010
Location: Sebastopol, California

Karma:

Senior Member

I installed a Pertronix electronic ignition for which I fabricated the mounting. I also decided to de-carbonize the heads. They deserved it!

I retightened the head bolts using a torque wrench to the proper settings. Some time later I noticed what I thought was an exhaust leak which showed up when the ONAN was powering two generators. I finally decided to track it down and found that the head bolts were now loose, some capable of being tightened almost by hand. I really don't understand why, since I was also reusing the old head gasket. But retightening them solved the problem and the generator is now relatively quiet again.

So, head bolts should be tightened after a few hours of operation if the heads are removed.

Jack Christensen - K6ROW, '76 Glenbrook/Clasco - "The Silver Bullet", Sebastopol, CA

Report message to a moderator

[Message index]

		ONAN Head Experience By: captjack on Tue, 08 July 2014 23:52
		Re: ONAN Head Experience By: jim kanomata on Wed, 09 July 2014 00:58
		Re: [GMCnet] ONAN Head Experience By: powerjon on Wed, 09 July 2014 08:17
		Re: ONAN Head Experience By: cbryan on Wed, 09 July 2014 09:41
		Re: [GMCnet] ONAN Head Experience By: Mr ERFisher on Wed, 09 July 2014 10:24
		Re: [GMCnet] ONAN Head Experience By: sgltrac on Wed, 09 July 2014 10:31
		Re: ONAN Head Experience By: Matt Colie on Wed, 09 July 2014 10:55
		Re: [GMCnet] ONAN Head Experience By: James Hupy on Wed, 09 July 2014 11:29

Previous Topic:	[GMCnet] Show Drain Closure
Next Topic:	Ignition Timing Question

Goto Forum:

-=] Back to Top [=-

Current Time: Fri Oct 04 10:30:02 CDT 2024

Total time taken to generate the page: 0.00874 seconds