Archived Pilot bearing? ( I hope not!)

[R Anestis]

I noticed a slight clicking on the way home from work the other day. The only origin that seems plausible is from th bell housing. It is most noticable below 1500 RPM's and follows the engine RPM. There is also now a vibrating below 1500 RPM's when coasting in gear (ie: downshifting). I't almost unnoticable when accelerating except when just starting out easily. So give me some ideas. I know I'm going to need a new clutch soon as a result of the Edge COMP. I'd like to know what this could be 'cause I have a feeling its really NOT GOOD! Lets hear about all the possibilities and upgrades so when I do have to redo the transmission (and that will probably be sooner than I would like), I can do it right the first time. Thanks for any help.

-Ron

 

[paccool]

Ron



I'm at a disadvantage here as I haven't heard the noise. My first thought is it is a U-joint. They will make noise when the load is reduced and will cause a vibration like you are talking about. The one thing that throws a curve into that thinking is your comment about the noise following the engine RPM. If the truck was in gear then as it slowed down, so would the engine. If you had it in neutral, then the engine would not have any thing to do with it.



My first guess is the joints.

 

[Extreme1]

Truck in gear, not moving, clutch in, noise follows RPM = pilot bearing or throwout bearing.



Truck moving, in gear, clutch out, noise follows RPM = anything in the driveline. If it changes depending on the gear, it is in the trans, if it changes with the speed, it could be in the trans or farther back.



Truck in neutral, clutch out, noise follows RPM = trans, specifically the input shaft bearing, countershaft bearing or the bearing between the input and output shafts.

 

[R Anestis]

More Detail:

OK, this time I'm not in a hurry. I think this is a clutch-related problem because for the past few months, I've noticed a peculiar "click" as I was letting out the clutch in 1st or 2nd gear from a stop. It didn't seem to affect the performance fo the clutch, and neither does the current situation. As best I can tell (the straight pipe makes it a little hard to discern), The clicking follows the engine RPM's. While deccelerating, the vibration is there below 1500 R's or so, and is most noticable in 1st, 2nd, and 3rd gears. It also seems to follow the engine R's. As soon as the clutch is depressed, the clicking/vibrating goes away. This does not appear to be a throw out bearing problem since there are no noises, vibrations, etc. when the clutch is depressed. The u-joints and carrier bearing(split drive shaft) all seemed tight yesterday when I was under it(no, it wasn't in gear), but tomorrow I'll jack it up and try spinning everything and watch what happens. The one thing I haven't tried yet is to let the clutch out in neutral while coasting. I'm going to crawl around under it again tomorrow and also try a few things while moving. Any more good ideas, I'm open to suggestion. Thanks for the replies. I'll let ya know what I find out.

-Ron