Official Cummins 6cta 450C thread

I have about a 3 year old newer style aftercooler with the air side drains. Was looking at replacing the long in the tooth other one which is the original style. It’s got some good pitting in spots inside the housing. Still seals good, though. But new ones are now scarce and unaffordable for me. Close to $6000. Can get a good used runabout for that price. Looks like I’ll be babying that old one for as long as I can. Might be some JB Weld filler in its future to keep it going.
 
This whole unavailability and cost of things at this time is just crazy. Hopefully you can get along without one for a while. Keep in mind that the only place that is critical is the actual surface that the o-ring touches, as long as the end of the housing is good, it should pressure test fine. Your post makes it sound as though the pitting is inside and hopefully not getting to close to the ends. Be careful with coating the insides of the cases with anything. You wouldn’t want chips or little pieces of epoxy breaking off and going downstream.
 
my3sons said:
This whole unavailability and cost of things at this time is just crazy. Hopefully you can get along without one for a while. Keep in mind that the only place that is critical is the actual surface that the o-ring touches, as long as the end of the housing is good, it should pressure test fine. Your post makes it sound as though the pitting is inside and hopefully not getting to close to the ends. Be careful with coating the insides of the cases with anything. You wouldn’t want chips or little pieces of epoxy breaking off and going downstream.
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The edge is good and O-ring seals it fine. Passes pressure test. About an inch down on the inside is a deep pit. Probably not much aluminum left there. I’m going to service that one annually to keep it healthy and to keep a watch on it.
 
A16BAC46-3052-4209-B19B-8E4866033A51.jpeg

Compared to other side

222AC462-6552-47EC-92E5-5885D0C6DFD7.jpeg
Need some help here. What is going on here?. This area is incredibly hot. Is it my air heater malfunctioning?
 
techmitch said:
Looks that way, possible relay stuck on.
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That’s exactly what the problem was. Disconnected power to the grid heater for now. Not a good system when it can supply unlimited heat from battery solenoids being turned on. Thank you
 
Blueone said:
That’s exactly what the problem was. Disconnected power to the grid heater for now. Not a good system when it can supply unlimited heat from battery solenoids being turned on. Thank you
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Remove it all. Throw it in the garbage. That’s what I’d do (well, I did). You’ll love the extra access it gives you as well.
 
Hey guys need some HELP

Was out yesterday went to check the bilge and noticed water under my port motor was able to find the source. Turns out it is coming the the metal hose from the heat exchanger to the gear cooler. Has anyone had this problem? seems like this problem might have started some time ago as there is rust around the hole in the pipe.
 
Vetman001 said:
Hey guys need some HELP

Was out yesterday went to check the bilge and noticed water under my port motor was able to find the source. Turns out it is coming the the metal hose from the heat exchanger to the gear cooler. Has anyone had this problem? seems like this problem might have started some time ago as there is rust around the hole in the pipe.
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Normal wear and tear. I replaced mine when I bought the boat 8 years ago. I’m getting some pitting again. You can take them off and temporarily patch with jb weld. You can get new ones from Cummins dealer or here:

https://www.sbmar.com/product/20-gear-oil-cooler-hx-s-s-pipe-1-75/

I’ve wondered about replacing the pipe and both silicone hose connectors with just one long wired hose. But I guess the heat of the engine is the reason for the metal pipe.
 
Blueone said:
That’s exactly what the problem was. Disconnected power to the grid heater for now. Not a good system when it can supply unlimited heat from battery solenoids being turned on. Thank you
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Where did you disconnect the power at?
 
SRMark said:
Where did you disconnect the power at?
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It was the port engine so disconnected power to the solenoids ….it’s temporary until I get back home. The solenoids were in rough shape…. You don’t see them just looking down you have to get on your hands and knees…worth doing
 
Blueone said:
It was the port engine so disconnected power to the solenoids ….it’s temporary until I get back home. The solenoids were in rough shape…. You don’t see them just looking down you have to get on your hands and knees…worth doing
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Does the motor run with them disconnected?
 
Blueone said:
Mine do I am mechanical…not sure with the electronic versions
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Mine are mechanical also. When I start my boat I see them cycling on and off. I am in the water from late April until late October. If I disconnect them I wonder if it will cause starting/ running issues in the cooler months.
 
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