cm870 ISX Turbo Screech Monroe/Charlote, NC

[Rawze]

can't see the video.. says not available. However ...

some people will describe the screeching sound "like letting the air out of a metal baloon".. or "sounding like it is scraping the housing at high speed".


Turbo screeching is 95+% always caused by the turbo mounting gasket failing (or an exhaust manifold gasket failing) and not the turbo itself.


Check that the torque on the 4 mounting turbo bolts is correct. On a CM870, this would be 74 ft-lbs for a 500-series turbo.


Also check the exhaust manifold and check all the torque on the bolts. They are supposed to be 45 ft-lbs. Any missing/snapped manifold bolts will cause it too.

If it still screeches, then the turbo mounting gasket has gone bad.