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Old 05-08-2017, 04:16 AM   #1
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Question Cummins heat exchangers

Hi
Can anyone tell me what I should put on the end gaskets when reassembling the heat exchangers, have just removed the end caps on both engines to remove broken anodes and not sure if I need to apply any form of sealant.
Phil.
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Old 05-08-2017, 05:45 AM   #2
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You probably don't need anything, but a thin wipe of Permatex on both sides of the gasket can''t hurt.

David
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Old 05-08-2017, 06:14 AM   #3
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You do not need anything at all. . A small amount of silicone grease will help seal and yet come apart easily next time. Do NOT use any sort of petroleum grease such as vaseline or any other normal grease, the petroleum grease may attack and soften the gasket.

You did not loose the small O ring around the central bolt did you?
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Old 05-08-2017, 07:07 AM   #4
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Thanks guys I thought as much but just wanted to be sure.
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Old 05-09-2017, 12:52 PM   #5
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Here is some great info.
I will be doing mine next year.

https://www.sbmar.com/articles/cummi...r-maintenance/
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Old 05-09-2017, 03:41 PM   #6
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The cummins aftercooler service, which is not the heat exchanger service, is quite important. It should be done every season. IF you decide to do your own, be very carefull. Also be sure to pressure test that after cooler after you reassemble. If you pinch an O ring or otherwise get a leak, you will be mixing salt water with the engine combustion air. That gets real ugly really quickly. My boatyard was a Cumins service enter and I had Cummins trained technicians.
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Old 05-09-2017, 04:59 PM   #7
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Smile

Fortunately I don't have after coolers so less for me to worry about.
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