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1975, 7.5 Kohler marine genset, runs only with the reset depresed

I have a 1975, 7.5 Kohler marine genset. it runs fine when i push in the reset button on the control section of the generator. The motor is fine and it seems to be generating power, it just won't keep running. It ran great all last summer every Sunday evening for about 4 hours but at spring startup it won't keep running. What I would really like is a service/trouble shooting manual for the generator control end. i have manuals for the engine end.
thanks
gary

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Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

Posted on Jun 12, 2010

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