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Old 03-19-2016, 12:37 PM   #1
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baldwinh's Avatar
2002 36' Land Yacht XC Diesel 300 hp w/2slides
Join Date: Dec 2015
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Why is my generator "clunking"?

My 8kw Onan Diesel generator has been working fine, when I push the pre-heat switch it goes "tickety-tickety" and after about 15 seconds fires right up.
This week while running it, it started to emit more of a "clunking" sound, very rythmic and regular (and pretty loud). I shut it down, today checked the oil level (clean and full) and when I pushed the Preheat button again to try staring, this time it gave off the "clunking" sound instead of the quiet purr of the normal "tickety-tickety".

Any ideas on what might be the problem? I didn't leave the preheat button pushed long enough to try to start it for fear the clunking was ruining something.

Thanks in advance for any ideas / input
Herb Baldwin
2002 Airstream Land Yacht 36 DP MH'
2006 Saturn Vue
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Old 03-20-2016, 04:36 PM   #2
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2015 28' International
Ofallon , Missouri
Join Date: Sep 2013
Posts: 542
Difficult or impossible to diagnose "clunk" virtually. However.....

Have you checked the mounting attachments? Maybe it is simply moving around when started and hitting something?
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