Question about Watts Onan Portable Generator - 4000 , Model# 5500

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I have a Onan 7.5 from 1998. only 80 hours on it. Would turn over very slow and would not start. Will not turn at all now. Fuel pump and celinoid kick in. Took out starter had it tested and it was ok. What to do next?

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If you have it for 12 years, it ran only 80 hours, it may have got rusty.
If you can open generator back cover, try to see the condition of generator iron (stator and rotor).Check the bearings.
Check the oil (level and condition, it may have water or gas in it).  
Take out the spark plug and without fuel try to turn the motor manually.
If you can turn it, try to clean if any rusty parts, drain the oil, clean the crankcase with cleaning oil (make a few turns)and fill it with good new oil.
Try to spray some WD 40 or some rust remover spray where you may have rust: the generator interspace, bearing legs, through the spark plug hole etc.
Thats all I can advice now. If no result try another quiary.

Posted on Jul 13, 2010

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