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Sgt B · 06-17-2022, 04:00 PM

Well I have my rig back in its parking space at the house after five weeks of trying to find a replacement turbo for it. It is a 2018 Cummins 6.7L, and would believe there were none available in the continental limits of the U.S. Unbelievable. The dealer tried, Cummins tried, I tried, and had several mech friends of mine and no one, absolutely no one could find that turbo. Cummins has it listed at "+56 day back order." I am a fairly mechanically-minded fellow for a old retired Marine Grunt, but I knew very little about the workings of a diesel turbo. After weeks and weeks of researching, talking to numerous companies throughout the U.S, I consider myself an expert when someone mentions turbos. LOL
Finally one of the older mechs at the dealer asked himself the question, why don't I take this turbo apart and see if I can fix it. He did, found out the seals and gaskets were coked. Ordered replacement kits that were available and he fixed the darn thing. Replaced the actuator and a couple pf other parts like the drain tube, etc. If you read my initial thread on this subject, I had taken the rig in to see what why the dash AC was not working. Needed a new compressor. While there he noted oil on the shop floor, crawled under and saw the turbo was leaking oil. That started the whole 5 week fiasco. I bought this rig as a downsize trade from my 2006 Newmar KS 3910. Paid near $7K for a five year bumper to bumper warranty. This entire turbo, dash AC fix came to just under $10K. Boy am I glad I bought that warranty.
Anyway, the "Grunt" is back in its spot beside the house and we will be shoving off on 14 July for a seven week trip visiting kids, grandkids and great grandkids. First stop will be the Winnebago rally in Iowa. Hope to see some of you Winnie owners there.

Ray,IN · 06-17-2022, 05:28 PM

Most Cummins authorized dealers, keep a supply of rebuilt turbos on hand for construction and farming industry engines.
I agree, It's sad that many mechanics have become so used to simply throwing a new part onto an engine, vs rebuilding the existing part.

That happened to me at a diesel shop a few years ago, I asked for a new gasket in my lift pump, but the shop simply bought and installed a new pump, at my expense.

Solo_RV_Guy · 06-17-2022, 07:19 PM

Good to hear you've made it home with repairs intact.

Safe travels!

Old-Biscuit · 06-17-2022, 07:28 PM

Coked Turbo.......run hard and put away HOT

After a HARD pull let engine idle for couple minutes before shutting down

Usually turbo has cooled down enough under normal driving.

Haven't heard of a coked turbo in long time
Previous owner must have worked it HARD and shut it right off

Sgt B · 06-18-2022, 08:34 AM

Quote:

Originally Posted by Old-Biscuit

Coked Turbo.......run hard and put away HOT

After a HARD pull let engine idle for couple minutes before shutting down

Usually turbo has cooled down enough under normal driving.

Haven't heard of a coked turbo in long time
Previous owner must have worked it HARD and shut it right off

I am certain that is what the prior owner did. Had 34,000 on it when I bought it. Many folks today especially with diesel prices through the roof shut that sucker down as soon as the poll off at a rest stop. I have never do0ne that. Funny though, I recently read on here where one of the senior members was saying you do not need to do that with the new engines. LOL,

153stars · 06-18-2022, 09:08 PM

The lift pump gasket on pump that you could take it apart, was discontinued.A place on eBay has ,I think two different ones that are reproduced.

Quote:

Originally Posted by Ray,IN

Most Cummins authorized dealers, keep a supply of rebuilt turbos on hand for construction and farming industry engines.
I agree, It's sad that many mechanics have become so used to simply throwing a new part onto an engine, vs rebuilding the existing part.

That happened to me at a diesel shop a few years ago, I asked for a new gasket in my lift pump, but the shop simply bought and installed a new pump, at my expense.