6BTA Molded Hose: Gear Cooler >> Heat Exchanger

[Rob Schepis]

The raw water molded hose that exits the gear cooler, drops down under the turbo and comes back up to feed the heat exchanger is no longer a single molded hose.  It is now supplied as a stainless tube and two elbow hoses.  There is concern of chafing of the molded hose.

I swapped both of mine the other day (circa 2002) and one was good but one was damaged.  Not a difficult swap with everything in place.  The picture with the turbo off is an old pic, just including it to show the hose as installed.  So if you are still running the molded hose there get your hand in there and feel around carefully for any rubbing/chafe damage..

Cummins 4020093 Molded Hose Replacement Kit

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[Tony Athens]

The history goes kinda like this.. Up to about 2000-2003-ish all the engines came with the 2 small hoses and the pipe.. –Then, someone thought Cummins could save $$ by going to a one-piece molded hose,  and eliminate a couple of potential leak points. Sound reasoning except that the hose diameter, especially when  under 15+ PSI was two close to the flywheel housing and would chafe through.. Not all did, but enough  did it that after enough failures/complaints over about 15 yrs,  they went back to the 3-piece system.. Rob caught his “lost weekend trip” by doing it proactively…I would heed his advice.

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