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TechWrench · 01-20-2004, 10:34 PM

On the first, pretty much right. From my experience, the throwout bearing will usually make noise when the pedal is depressed if it is going bad, and stop making noise when the pedal is released. In most cases, the noise is anywhere from a growl to a squeal, depending on how far gone it is.

One the second, if, when you refer to the pilot bearing, are talking about the bearing/bushing in the end of the crankshaft that the tip of the transmission input shaft fits into, I would dissagree. When the clutch is engaged (pedal released), the input shaft and crankshaft are turning as one. There is no movement of the pilot bearing, and it shouldn't be making noise. The only time a pilot bearing could normally make any noise would be when the clutch is dissengaged (pedal depressed), and the crankshaft is turning but the input shaft is not. The more likely cause of noise/grinding when the clutch is being engaged (pedal released) would be the support bearings in the trans case for the counter shaft or maybe the reverse idler shaft. But this would also depend on whether or not you were in a gear or neutral.

On the third, yes that could be the syncros, but I would ask want to clarify something. When you say it "won't go into gear unless rolling", do you mean it makes a grinding noise when trying to put into gear if the truck is sitting still, or it just won't go into gear unless the truck rolls a bit?

01-20-2004, 10:34 PM	#2 (permalink)
TechWrench Registered User Join Date: Aug 2003 Location: Glenville, NY Posts: 507	On the first, pretty much right. From my experience, the throwout bearing will usually make noise when the pedal is depressed if it is going bad, and stop making noise when the pedal is released. In most cases, the noise is anywhere from a growl to a squeal, depending on how far gone it is. One the second, if, when you refer to the pilot bearing, are talking about the bearing/bushing in the end of the crankshaft that the tip of the transmission input shaft fits into, I would dissagree. When the clutch is engaged (pedal released), the input shaft and crankshaft are turning as one. There is no movement of the pilot bearing, and it shouldn't be making noise. The only time a pilot bearing could normally make any noise would be when the clutch is dissengaged (pedal depressed), and the crankshaft is turning but the input shaft is not. The more likely cause of noise/grinding when the clutch is being engaged (pedal released) would be the support bearings in the trans case for the counter shaft or maybe the reverse idler shaft. But this would also depend on whether or not you were in a gear or neutral. On the third, yes that could be the syncros, but I would ask want to clarify something. When you say it "won't go into gear unless rolling", do you mean it makes a grinding noise when trying to put into gear if the truck is sitting still, or it just won't go into gear unless the truck rolls a bit? __________________ TechWrench If it ain't broke, fix it till it is. ---------------------------------- '03 SR5 V6, Titanium, 275/70-16 REVO's on '02 OEM alloys for winter. Anti-chipmunk mod for fresh air intake.