Finally, back to my '91 Talon project I've had waiting to be finished for YEARS literally.
I recently had an issue with a noise, kind of a rapping/tapping noise that got louder as the engine warmed up. [BAD serious once engine was warmed up] I had thought it was the cylinder head I had just done (second one I had recently put on this engine), I was way bummed about that.
Then I found something new, as the engine was running making this noise- if I used a prybar to put pressure directly on the bolt which mounts the timing belt tensioneer pulley... the sound would go away!
From this, deduced that the new tensioneer pulley bearing was probably bad (that part was only 1,000 miles used, but was re-used after car suffered that last bad overheat and warped cyl head. hmm)
I just installed another new timing belt tensioneer pulley, as well as a new hydraulic tensioneer this time! Started the car to check (before I even have the crank pulley fully assembled and the accessory/water pump belts installed).
PROBLEM: new squeaking/rubbing sound which increases with RPMs. I noticed immediately, turned off engine, and saw that there was a slight film of residue kind of waxy/greasy/plasitc-residue immediately building up on the engine-side edge of the timing idler pulley. Also that (outer engine-side) edge of the timing belt looked slightly lighter now like the belt IS rubbing against something.
You can wipe residue right off idler pulley with finger, but start the engine again for only seconds and re-check, residue is built right back up in a ring around that edge of the pulley.
I can NOT figure out where it could be rubbing or whats going on here.
(the outer main crankshaft pulley not being installed yet with the accessory belts couldn't have this effect could it?)