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Old 09-20-2009, 05:22 PM   #1
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Onan Microlite 4000 spark plug removal

Ok, I give up! I have spent a better part of the day trying to remove a little tiny spark plug from my Onan generator. I have tried every socket size metric and US. It is absolutly a miserable design on this generator to access and remove a spark plug. Using a 1" hole saw I cut a hole in the mouting case below the spark plug location on this engine. This for two reasons: easier access to the spark plug AND most important to see if anything was keeping the socket from fitting onto the spark plug. Nada and no way. I still cannot get a socket onto this spark plug. What pray tell is the secret to getting a spark plug out of this unit? Please advise.
Thank you.

1995 Winnebago Minnie 300, Onan has 77 hours total!!

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Old 09-20-2009, 10:32 PM   #2
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14mm, I suspect - and it should be a spark plug socket, or it probably won't work. Most deep well sockets don't have a big enough center bore.

Norm & Janet

FMCA; WIT; FCOA; Good Sam; Passport
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Old 09-21-2009, 06:03 AM   #3
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Thanks for the quick reply Norm. I will post the results.
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