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Old 10-30-2015, 11:10 AM   #1
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Valve Lash Adjustment, Onan 10K

I would be interested in knowing how many of you have done the valve lash adjustment on your Onan generator. My manual says do it every 800 hours. I now have just over 1,100 hours and PO of my coach only put about 600 hours on it.

Mine will be in a full service RV shop soon and I am thinking I may let them do the valves, replace the belt and maybe the temp sensor. The temp sensor (at least on the 7.5 KW Onan's) was a known problem with causing false over temp shut downs.

I do know that even when my generator slide is fully extended, you cannot reach the rear most bolts on the generator lid. It is a shame that CC did not configure that slide to move out just another 2".

'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.
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Old 10-30-2015, 11:14 AM   #2
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Have not done the valve lash adjustment, but have taken off cover using a ratcheting box end on the back bolts.


Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
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Old 10-30-2015, 01:40 PM   #3
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Generator cover

Originally Posted by BrianGlenn View Post
Have not done the valve lash adjustment, but have taken off cover using a ratcheting box end on the back bolts.


a swivel ratchet ring spanner sorts the back bolts without having to get under the coach

Ian S.

2005 Allure 430
Onan 8000 generator
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