icanfixall
Official GMM hand model
My last 180 mile run saw a lower boost pressure. Kinda low hp buttometer seat of the pants feeling. So I looked for a boost leak or exhaust leak.. Found none. Removed the cdr and filter adapter and ran the engine. Inlet fan was turning and looked good. Pulled the fuel shutoff solenoid wire from the injection pump to kill and watch the turbo spool down. It stopped really quickly. So I tried to spin it by my fingers and it was tight... Well... Lucky me... I had a spare Banks wastegated turbo I had rebuilt about 5 years ago.. So I installed it. Test ran the engine today and all seems well. Tomorrow I will drive it and see what the boost is. Why would a turbo shaft be hard to spin. I understand they run of an oil floatation wedge but it sure is diffucult to spin by hand. I ALWAYS cool the exhaust temp to 300 or lower befor I shut down the engine. I understand oil above 300 degrees will cook in the bearing sleeves and ruin a shaft. I change oil at 3000 miles and only use Chevron Delo 15W40. Thanks for any ideas. I will be getting this now spare turbo repaired too.