1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Changing a thermostat

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Old 04-30-2010, 08:08 PM
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Default Changing a thermostat

I'm replacing all my coolant hoses and i've never replaced the thermostat. How hard is it?? I can see part of it, do I need to take the alternater off to replace it? Any info would be appreciated.

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Billy D
 
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Old 04-30-2010, 08:10 PM
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get a cummins replacement, parts store ones will run hot. There is no "gasket" as your used to seeing, just a rubber ring. Make sure the hole is at the top.
 
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Old 04-30-2010, 08:12 PM
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Old 04-30-2010, 08:26 PM
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Thanks guys, doesn't look bad. So do I have to take the alternater off? It looks like it.
 
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Old 04-30-2010, 10:19 PM
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Yeah you have to undo the top mount for the alternator and then there is the three bolts that hold the housing. Take those off and pay attention to how they go on exactly so you don't look at all the piece and say "say what the hell". And you should be able to get it done pretty easily.
 
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