Onan 4K Rocker Arm Cover

DonTom

Senior Member
RV LIFE Pro
Joined
Apr 21, 2005
Posts
20,559
Location
Auburn, CA or Reno, NV
I am having trouble finding this rocker arm cover gasket anywhere, yet it is a very common 4K Onan Genny. I need a part number or something to go by to order this gasket for my Onan
4.0 KY-FA/26100 J in my Y2K RV:

4Krocarmgasket.JPG



-Don- Auburn, CA
 
I think you need gasket 110-3861
Thanks!!

I just wonder why I had no luck after spending an hour or so searching for it, including on Ebay where I just now ordered a couple after receiving your message:

1733459537925.png

1733459749817.png



BTW, how did you find it?

-Don- Auburn, CA
 
Dang, 40 bones for a gasket? I think I'd take my chances and see if the original survived removal. A little permatex goes a long way.

Mark B.
Albuquerque, NM
 
Dang, 40 bones for a gasket? I think I'd take my chances and see if the original survived removal. A little permatex goes a long way.

Mark B.
Albuquerque, NM
And a small gasket. But I don't expect Onan parts to be as cheap as the average car parts.

But yeah, I think my gasket could have been reused, but I prefer to use a new one and have a spare for the next valve adjustment.

-Don- Auburn, CA
 
There shouldn't be any pressure there so unless it tore or was deformed I'd run it again. But I'm a cheap arse.

Mark B.
Albuquerque, NM
 
There shouldn't be any pressure there so unless it tore or was deformed I'd run it again. But I'm a cheap arse.

Mark B.
Albuquerque, NM
Well, I am not that cheap, but after I looked at the gasket I decided I could have done my valve clearances while at Gunshot Wash, AZ & just reuse the same old gasket--but I would still order new ones.

If there were no trace of any leaks with the old gasket, I probably would have left it in and never bother with putting in the new ones. But I never removed the cover when at GSW. But now I wish I had completed the job while there. But I do not like to work on things while they are needed and working well. As the genny did while at GSW.

I am back in Reno because my new Onan Carb will be delivered here today. FWIW, I have a spare Chinese carb and I just took a good look at it. I mentioned before that it had a 10,000 ft label but would stop at 5K'. Well, I discovered the label was put on incorrectly on each of my Chinese carbs. The minimum adjustment was way below zero by the label. I was able to remove the label and align it correctly so now it says it will adjust from 0 to 10,000'.

But this had nothing to do with my high elevation problem with my genny at 7K feet while in Flagstaff. It ran way too rich even when adjusted for the max possible elevation of 10K'. But it works very well at lower elevations regardless of what elevation it is set for.

I will soon see if the Onan Carb helps when at 7K'. But also my valve clearances will be adjusted by then. I have not checked yet to see how far off it is, I will do that the next time I am in Auburn, which should be in just a few days.

-Don- Reno, NV
 
MSRP is about $19, but shipping from many online sellers is the killer
There is a Cummings dealer just a few miles from here. I wonder if I could buy it (or order it) there for $19.00.

Or are you looking at a twenty-five-year-old price from when this genny was first made? $19.00 back then will be ~$36.00 today.

-Don- Reno, NV
 

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