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Old 14-06-2011, 13:47   #1
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Coolant Backflows After Putting Engine Together

Help, I just replaced a broken dipstick tube on my Perkins 4108. I removed the Bowman Heat exchanger/exhaust manifold and the starter to get to the tube. My problem is after putting the engine back together the coolant appears to be overflowing into expansion tank and eventually overflowing. I've never had a problem with this in the past and cannot figure out what the issue is. Any help would be appreciated.....
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Old 14-06-2011, 22:03   #2
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Re: Coolant backflows after putting engine together

It sounds like the fresh water hoses maybe hooked up in reverse.

Or, you may just have too much coolant in the system to start with. When cold the coolant should be 2-3" below the fill cap.
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Old 14-06-2011, 22:34   #3
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Re: Coolant backflows after putting engine together

The rubber ends on the heat exchanger are what separates the fresh water from the salt. Check those.
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Old 15-06-2011, 10:38   #4
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Re: Coolant Backflows After Putting Engine Together

Thanks sww914, I've investigated your lead and found the end caps integrity looking faulty, I had 1 in my inventory and I ordered the other end cap so hopefully this will do the trick. Delmarrey - your tips I also researched and all was well..... So I will post the results in a few days.
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Old 24-06-2011, 14:23   #5
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Re: Coolant Backflows After Putting Engine Together

Thanks for the input. The engine is repaired. I put 2 new caps at each end of the heat exchanger and that did the trick. Then I had a leaking water pump so I replaced that and the engine is running great!!
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Old 24-06-2011, 19:19   #6
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Re: Coolant Backflows After Putting Engine Together

EXCELLENT!
I'm glad I got one right!
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