LARRY BRUDZYNSKI Posted June 12, 2008 Share Posted June 12, 2008 Hey guy's, have run in to quite a few turbo failures after replacing. After some investigation into this, We came up with a problem that you may see bearing failure being caused by some techs slapping a turbo on and not changing the oil or starting it up without prelubing them. When we tore the turbos down the bearings were burnt to a crisp and the oil was very gritty. Has anyone else seen repeat failures? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted June 12, 2008 Share Posted June 12, 2008 Has anyone else seen repeat failures? This is a fairly common topic that is not limited to VGT's. I get calls from students stating they've put X number of turbos on the same truck within some small amount of time and they want to know why. I repeat the same thing you stated about pre-lubing and oil contamination. I did hear of some offshore CHRA cartridges that were junk on 7.3s a while back, and you probably got several in a row from the same supplier if it was bad. I always recommend an oil analysis when anything weird like this happens. Oil analysis is certainly one of the cheapest, most overlooked forms of diagnostics. Yea, it takes a week or so if you don't have a lab handy, but some Cat facilities have a spectrometer on site and can give you a printout immediately. If you don't have a lab nearby, Napa/Wix 4077 is the best $14 you'll ever spend. BTW Larry, what's your policy on holding the impeller on startup for prelubing? P.S. My policy when I ran the shop on stuff like this was to change suppliers when I got a bad one. Too many times the supplier had a problem and had several bad in a row....... /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted June 12, 2008 Author Share Posted June 12, 2008 Quote: BTW Larry, what's your policy on holding the impeller on startup for prelubing? We fill the turbo as best that we can and on the Fords pull the IPR connector and crank for about 20 seconds to get oil flowing before starting them up. On the Cummins we will disconnect the fuel solenoid and do the same, Just need to make sure it won't fire up before cranking. As for oil-samples I send mine up to Grand Rapids Mi Cummins they usually have a sample done within 24hrs and fax the results right to me. Quote Link to comment Share on other sites More sharing options...
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