Attention: TDR Forum Junkies I did a quick and dirty inspection of my turbo and what I saw disturbs me. I released the exhaust clamp that holds the cast (45 or so degree) elbow to the turbo outlet. Pushed it to one side a short distance then used a mirror and flashlight to look at the turbine wheel. It looked just fine (to my untrained eye) but the nut that fastens it to the shaft may have a problem. What I saw was a twelve-point nut with pieces missing from the outside. The nut was not cut through; in fact it may not have been cut more than 1/3 it thickness. I can’t tell if these missing pieces have broken away or whether the manufacturer might have ground them off to balance the rotation.
I have an exhaust gas temperature gauge (with thermocouple ahead of the turbo) and have not seen temps above 1200 degrees and then only when towing 10,000 lbs loads.
Background:
In a recent post I reported that this truck (97 model 2500 with #8 TST 95k on odometer) would not indicate boost above 21 lbs. Respondents (to that post) said boost numbers should be higher so I checked the gauge. I have found an error in the truck mounted gauge --- it reads 21 lbs while two other gauges read 25. 5 lbs. Boost readings from this turbo/gauge combo are about where they have been for the past 50,000 miles.
Question: Does this turbo have a problem?
I have an exhaust gas temperature gauge (with thermocouple ahead of the turbo) and have not seen temps above 1200 degrees and then only when towing 10,000 lbs loads.
Background:
In a recent post I reported that this truck (97 model 2500 with #8 TST 95k on odometer) would not indicate boost above 21 lbs. Respondents (to that post) said boost numbers should be higher so I checked the gauge. I have found an error in the truck mounted gauge --- it reads 21 lbs while two other gauges read 25. 5 lbs. Boost readings from this turbo/gauge combo are about where they have been for the past 50,000 miles.
Question: Does this turbo have a problem?
