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Old 09-13-2016, 06:32 PM   #1
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Cummins 8.3 rotten rad

Hi, just take off my radiator from my Cummins 8.3 CTA6 engine. First have to take away the tranny rad and the aftercooler one and finally engine one. I think that the engine rad never been change since 1995, believe me it was very rotten, took me about two hours and an half to do the job, not really pina. Tomorows going to the radiator shop scared to see how it will cost me, anyway i will let you know. BTW the intercooler was paint in black originaly i think so paint was all Unstick do you think that i should paint it again or live it on its aluminium originality ?

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Old 09-13-2016, 07:45 PM   #2
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We've got a 98 8.3L 6CTA also.
Last year I pulled out the CAC and radiator for cleaning and thermostats/hoses. Yes, it was a "job", but worth it in the end.
Both the radiator and the CAC were painted black from the factory. The black helps to dissipate the heat.
Had heating up issues. The radiator and CAC were filthy on the engine side, but clean inside. The gunk caught in the fins of the radiator and CAC were my issue. Degreaser, soft bristled brush and WATER got them cleaned. Rinse out the inside of the CAC, too.
I nicked the radiator (1 fin) and had it cleaned and fixed at a shop - $75.
Do the thermostats (yes, 2) and replace hoses while it's easy to get to. I did the belts, too.
Pull the water pump and check it out. All it takes is a new o-ring to put it back on if it is good.

Good luck!

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Old 09-14-2016, 01:23 PM   #3
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last year iwhen haveing serivice i told them to change and flush radiater and ohhoh it blew in the pressure test...the rad shop said cant fix so they found a like one with outlets in same place and just sightly bigger sq in... fit fine and cost was 2200 with labor and parts. n coolant// i take mine to a bus shop.. they do good job for hourdly instead of book rates.. i hate book rates.. many take one hour and charged 3 ect.....
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Old 09-14-2016, 06:46 PM   #4
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Have been servicing the cooling system ever 3 years with flush, new coolant and water filter and want to hear if that is what you have been doing? With proper cooling system service I would say 25 years of service isn't expecting to much.
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Old 09-14-2016, 07:06 PM   #5
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Originally Posted by tom chelbana View Post
Have been servicing the cooling system ever 3 years with flush, new coolant and water filter and want to hear if that is what you have been doing? With proper cooling system service I would say 25 years of service isn't expecting to much.
Tom, I think you're wasting money changing coolant. Use a good Extended Life coolant and have it tested every two years. Replace the SCA package if required but there is No Need to replace the coolant that often. If you have a coolant filter there are different filters with differing amounts of SCA additive as required.
The issue these folks are having is to the exterior of the radiator not the internals.
Sending a sample from the engine oil, trans fluid and coolant will be much less costly and give you a lot more bang for your buck.
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