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Old 04-18-2023, 01:38 PM   #1
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HDKAJ Thermostat removal-Vectra 2004

Has anyone removed the thermostat housing on an Onan HDKAJ genset? Mine is broken and needs to be replaced. Will I have to remove the water pump as well?
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Old 04-18-2023, 01:56 PM   #2
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This thread may be helpful: 7.5 Quiet Diesel Gen, just finished issue(s) corrections
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Old 04-25-2023, 05:51 PM   #3
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I had a code 33 problem on ours a couple years ago, had to buy a motorcycle jack, drop the genny, jack the coach way up, and slide it out to get to the sensor which screws into the thermostat housing. As FireUp has said, removing that sensor is a chore - it really DOES NOT want to come out. But after trying heat, cold, and everything else I could think of, it finally came out. I put in a new thermostat and fan belt while I had it in my garage. Lesson learned - run that thing for an hour every month under serious load to make sure the coolant circulates and the thermostat opens!
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Old 04-25-2023, 10:41 PM   #4
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I have a broken thermostat housing. To remove it I have to take off the gear housing.
Thanks for your reply.
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Old 05-02-2023, 05:48 AM   #5
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Update: To remove the thermosat housing, the engine head has to be removed; not the gear housing. Cummins is charging me nearly $5,000 for the fix. To remove a 1/2" long bolt!
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