Exhaust Leak

[NWIP]

I just posted about an exhaust leak discovered recently in Cummins forum for those interested.

Thread 'ISL9 Exhaust Leak'

Yesterday at 10:05 AM

I am currently at Cummins in Chattanooga, TN to fix an exhaust leak. First noticed a high pitched squeal at idle and Cummins Billings identified it as an exhaust leak on #6 cylinder port. Travel schedule with a commitment at end of October I chose to get this fixed once I arrived in north GA.

Cummins service inspected and also found one bolt on #1 port had backed out about half way. I have 70,000 miles on the engine and have elected to install new gaskets across the manifold. I got lucky, all bolts were free and none broken. I’m a little disappointed that at 6 years, 70,000 miles this...

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[J&JD]

I had a high pitched squeal at 70k that turned out to be a warped exhaust manifold. No new manifold was available nationwide. Ended up resurfacing the old manifold. Unbelievable that this should happen at 70k miles on an engine used throughout the industry. And then to not have parts available is inexcusable.

 

[Ftharrisiii]

I too had an exhaust leak on my DSDP at 7 years and 60,000 miles. Freightliner in Las Vegas diagnosed a warped exhaust manifold and replaced it, but apparently failed to torque the top two nuts holding the turbocharger to the exhaust manifold. 800 miles into our first trip after the repair, both of the top nuts securing the turbocharger vibrated loose and the turbocharger gasket blew out. I lost both boost pressure and the engine brake in rural Wyoming. After a trip to home depot to get 17mm nuts, I was able to limp into Casper and the Kenworth dealer fortunately was able (willing) to do the repair. We cut our trip short and headed home. That's the closest I've come to being stranded on the side of the road.