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Topic: Onan Microquiet 4000 450 hour service (Read 269 times) previous topic - next topic
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Onan Microquiet 4000 450 hour service
We are probably several months away from having 450 hours but looking at the manual I see the recommendation to clean/replace cylinder head and adjust valve lash.

Has anyone had this done and what is the cost?

Jim
Re: Onan Microquiet 4000 450 hour service
Reply #1 –
When I hit that point, the Onan service tech said they did it with something they spray into the cylinder.  It was included in my routine service cost.

Ken F in ID (briefly)
'08 MB
Re: Onan Microquiet 4000 450 hour service
Reply #2 –
Quote from: Kenneth Fears  - 
When I hit that point, the Onan service tech said they did it with something they spray into the cylinder.  It was included in my routine service cost.

Ken F in ID (briefly)

I guess that might clean the cylinder head but it wouldn't adjust the valve lash.

Jim
Re: Onan Microquiet 4000 450 hour service
Reply #3 –
Quote from: Jim & Gayle  - 
We are probably several months away from having 450 hours but looking at the manual I see the recommendation to clean/replace cylinder head and adjust valve lash.

Has anyone had this done and what is the cost?

I had the Onan MicroQuiet 4000 450 hour service done last year.  The total was $138.16 including labor, a new fuel filter, a spark plug, and oil for an oil change.  It was done at Brookings Harbor RV, Brookings, OR, and I recommend them.

Re: Onan Microquiet 4000 450 hour service
Reply #4 –
Quote from: Jim & Gayle  - 
We are probably several months away from having 450 hours but looking at the manual I see the recommendation to clean/replace cylinder head and adjust valve lash.
Has anyone had this done and what is the cost?
For many years. I maintained a fleet of various sized generators, including a lot Onans, and never removed head to be decarbonize.
Didn't do many valve adjustments either, unless they were noisy.
It would be hugely expensive in a LD, since the generator has to be removed to access the head.
The valves can be adjusted but it is difficult and many times is not necessary. It is similar to adjusting an OHV motorcycle engine, if you wish to give it a try.
Are the valve noisy?

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Onan Microquiet 4000 450 hour service
Reply #5 –
Quote from: Larry Wade  - 
For many years. I maintained a fleet of various sized generators, including a lot Onans, and never removed head to be decarbonize.
Didn't do many valve adjustments either, unless they were noisy.
It would be hugely expensive in a LD, since the generator has to be removed to access the head.
The valves can be adjusted but it is difficult and many times is not necessary. It is similar to adjusting an OHV motorcycle engine, if you wish to give it a try.
Are the valve noisy?

Larry

You read my mind, Larry. I had thought about updating my question to ask, should I even bother? The valves aren't noisy and it runs great. I worried about letting someone mess with it given that it is working so well. Currently, have 402 hours on ours. Thanks.

Jim