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Last Friday I drove down to the dealer where I bought my Duramax a year ago.
The intent was to talk to ser. mgr about secondary filter. Did so and he stated that should help and no reason to affect warranty. Said GM should be happy with the increased filtration, post or pre OEM.
Then he showed me a 2002 dmax, 67k, out in shop. First came in with crankcase full of diesel fuel. This is a small dealer and they had little experience on Duramax, so they called Chev. Tech Assistance who advised them to pull a vacuum test on return lines back toward injectors. Stated that if it wouldn't hold vac. to pull valve covers and tighten return line banjo fittings and check vac. again. If OK now, then button up, change oil and filter, and try it out.
Vac. test did show loss, and above was done, apparantly w/o a balance test, I didn't think to ask about that. Truck ran great, all appeared fine, and owner picked up truck and left.
Next day, he called and they had to tow truck back in. Crankcase again full of diesel fuel, truck had made loud clattering noise and was skipping. Investigation revealed no compression, and regional GM man now got involved. Truck had been driven 87 mi. since owner picked up!
He had the tech to pull head and engine had one bent intake valve and a cracked injector! I haven't talked to him again since Tues. so I don't know the final outcome.
My theory is that diesel fuel in oil twice in such a short time caused the valve to stick open. There is a mark in top of piston where vave and piston collided.Will report any further developments on this.
The intent was to talk to ser. mgr about secondary filter. Did so and he stated that should help and no reason to affect warranty. Said GM should be happy with the increased filtration, post or pre OEM.
Then he showed me a 2002 dmax, 67k, out in shop. First came in with crankcase full of diesel fuel. This is a small dealer and they had little experience on Duramax, so they called Chev. Tech Assistance who advised them to pull a vacuum test on return lines back toward injectors. Stated that if it wouldn't hold vac. to pull valve covers and tighten return line banjo fittings and check vac. again. If OK now, then button up, change oil and filter, and try it out.
Vac. test did show loss, and above was done, apparantly w/o a balance test, I didn't think to ask about that. Truck ran great, all appeared fine, and owner picked up truck and left.
Next day, he called and they had to tow truck back in. Crankcase again full of diesel fuel, truck had made loud clattering noise and was skipping. Investigation revealed no compression, and regional GM man now got involved. Truck had been driven 87 mi. since owner picked up!
He had the tech to pull head and engine had one bent intake valve and a cracked injector! I haven't talked to him again since Tues. so I don't know the final outcome.
My theory is that diesel fuel in oil twice in such a short time caused the valve to stick open. There is a mark in top of piston where vave and piston collided.Will report any further developments on this.