Re: Turbocharger failure Reply #25 – April 25, 2015, 10:21:07 am DaveGlad you got the turbo out before it broke apart and did more damage to your engine, CAC, etc.Great idea about having the turbo rebuilt vs a " new " one ( aren't the new ones rebuilt anyway??).After reading this I had my turbo checked here at Bernd's while they are putting on my resonator. Looked good, spins free- yeah.Hope you get your issues taken care of and get back on the road soon.say Hi to NancyTed & Karen Quote Selected
Re: Turbocharger failure Reply #26 – April 25, 2015, 10:48:36 am It looks like you dodged the bullet on this one Dave! Now I have to check ours... which I assume is done by loosening the clamp and pulling the boot off of the compressor? Obviously the turbo needs to be removed to check the exhaust side of it... but I guess if if the compressor looks side looks good and it spins freely, that is a good indication of the health of the turbo. It will be interesting to see if you notice any higher boost numbers after you are all done.Don Quote Selected
Re: Turbocharger failure Reply #27 – April 25, 2015, 11:10:44 am Rebuilt turbos are as good as new as a new cartridge is installed in the old compressor and hot section after they have been bead blasted. High EGT could come from air cleaner restriction or timing spot on the crank dampener could have migrated a few degrees if it is two piece so injection timing is retarded. Retarded timing causes high EGTs, advanced timing causes higher combustion chamber pressure. Some Cummins dampeners are two piece with a layer of rubber between the two parts. The dampener has to be replaced if if moves more than 1/16" from it's original location. A wet air cleaner from rain or road splash will cause a high restriction. Older U280/U300 had the air cleaner right behind the rear tires and could pickup a lot of dirt and water.For Detroit operators, here is a good example of an outright rebuilt turbo on eBay: Detroit 6V92 turbocharger Turbo 6V 92 DD 8924252 Garrett TV7301 466176 9001... Over $2K new so having one rebuilt or buying online save a lot of $$$.Pierce Quote Selected
Re: Turbocharger failure Reply #28 – April 25, 2015, 08:33:59 pm Quote from: acousticart – April 25, 2015, 10:48:36 amObviously the turbo needs to be removed to check the exhaust side of it... bDonNo you can just remove the clamp that holds the exhaust piping to the end of the turbo since there is a flex pipe connection and then (suggestion) use your procto-scope (borescope) to look at the turbine wheel. Or permanently damage your neck by looking at it directly... Quote Selected 1 Likes
Re: Turbocharger failure Reply #29 – April 25, 2015, 08:36:47 pm Quote from: Pierce & Gaylie Stewart – April 25, 2015, 11:10:44 am...High EGT could come from air cleaner restriction or timing spot on the crank dampener could have migrated a few degrees if it is two piece so injection timing is retarded. Retarded timing causes high EGTs, advanced timing causes higher combustion chamber pressure. Some Cummins dampeners are two piece with a layer of rubber between the two parts. The dampener has to be replaced if if moves more than 1/16" from it's original location. Pierce I thought the timing was off the flywheel?? The only dampener I know about is the one on the output pulley. Is there another one? Quote Selected
Re: Turbocharger failure Reply #30 – May 13, 2015, 10:55:35 pm Just a follow up on taking our first road trip (1000 mi up to Jackson WY) after installing the rebuilt turbo:All our high EGT problems seem to be gone, boost goes up much faster than with the old turbo, and more power! Mirabile Dictu!And on a trip with lots of slow and steep climbs, an average of 8.3 mpg, which totally beats our usual 7.0-7.6!I'm guessing that the old turbo had been coked up for a while before the compressor failure and was slow to rev, even though the top boost with the old turbo was near the peak that we have now (23-24 psi). Happy! Quote Selected 2 Likes
Re: Turbocharger failure Reply #31 – May 13, 2015, 11:49:54 pm Dave,Great news with the turbo! Good mileage for heading up to Jackson. Yellowstone was about 5 mpg for us while in the park.Some engines have the timing sensor pickup off of the dampener, others of the flywheel/flexplate.Pierce Quote Selected
Topic: Turbocharger failure