**update** Scroll down and see post 19.

So as title says all my gears are grinding when shifting and being put into gear. When I do the rev test the car doesn't move, but at about 2800 rpm a nasty grinding sound/feel comes from the clutch pedal. All gears go in smooth and high rpm shifting is fine is just makes this really really bad sounding noise that I can feel in the shifter and sometimes in the pedal. It only does it when the pedal is pushed in as soon as it's released the grinding stops. Car got a new stock master about 5k miles ago, and new clutch about 2k miles ago. Spoke to the guy who did the clutch and he drove it and hes telling me its the master. Done some research and an input shaft bearing or throwout bearing seems to be more common with what Im experiencing. Could it be the master or is my mechanic mistaken? Or possibly made a mistake on the clutch install and saying its the master to cover his ***? Please help.

 

No one? Whys it so hard to get info on here..

 

Dude you just posted so chill out. If it's grinding it's transmission internals. Drop the trans and pull it apart see what you have. Could be a number of things. We could guess all day but the only way to know for sure is to tear it apart.

 

Thats not correct at all it can grind for a number of other reasons. Bought my car with a half *** poorly installed clutch that crapped on me after 3500 miles and it was grinding all the gears cause it wasn't engaging properly. I don't see how grinding automatically means internals especially when it's all the gears and not just one or two. Its also not that easy for some people to just drops the trans and pull it apart not everyone on here is an experienced mechanic with a ton of tools. My question was could this issue be the master cylinder or not?

 

Yes I am completely incorrect, you know what's wrong so just fix it then. But anyways,If you have already replaced the clutch, already replaced the master cylinder and now it is still grinding I say it's something with the transmission, now unless you have some person that installed them incorrectly....then who knows. Isolate where the noise seems to be originating from. You say you clutch pedal is engaging/disengaging properly and have no spongy or excessive play in it, so leads me to believe it's not the master. I'm still going with your going to have drop the transmission to inspect the clutch, and if that all checks out then then internals.

 

what slave are you running? was the slave replaced?

 

Still the original slave. It's not leaking, fluid in the reservoir is black though.

 

If the fluid is black, I would go the easy route first, try flushing it and bleed the whole system and then see how it is from there, if it's still doing it I would take the advice above, and replace the slave. Obviously inspect the clutch and components while your in there as your going to have to pull the trans anyways.

 

Thanks thats the plan, cant get it to the shop till Tuesday but it will be flushed first and usually its murphys law with this damn car so I probably will need to have the trans dropped and have everything looked over. But back to my original question. Im assuming this issue is most likely not master cylinder related?

 

When doing a clutch I would always replace the slave at the same time since it's easy insurance and your already in there. You said it's the original slave with who knows how many miles on it, and your fluid is black. Since the master was already replaced, if flushing and bleeding doesn't fix it I would go that route. A new GM salve is only like $60 I believe or cheaper

 

+1 on the gm slave

 

OP

doubt it is the MC since you seem to have full "disengagement" if you did the"rev test" and it dod not move forward.

bad pilot bearing or TO bearing , clutch in that order is what I would guess. sure it could be "internal" tranny but you will have to pull tranny to look at anything in front of it anyway.

if it turns out to be pilot bearing...make sure input shaft bearing is not bad. there should not be any "slop" in the input shaft

 

Sounds alot like a bad pilot bearing...

 

Brand new pilot bearing was put in with the new clutch 2k miles ago. However, the retard who put in the previous clutch gutted the pilot bearing that was in there and reused it... Reusing it is bad enough but I can't understand why the hell he gutted it. So there was plenty of slop in the input shaft for the whole 3500 miles that that clutch was in there. So could the input shaft bearing be damaged from that? I know I have full disengagement cause it doesn't move during the rev test but it does start grinding like hell down there at 2800rpm.

Also, the whole time I had the previous misaligned clutch with the gutted pilot bearing, tons of input shaft play, and loose pressure plate bolts it never grinded the way it is now. It was all in the shifter, no pedal grinding, the grinds sounded a little different and it felt different more like all the syncros were bad and it was extremely difficult to put into any gear. This current problem is not like that so it would be weird if it was being caused by one of those things, especially since I've had no issues for 2k miles since the new clutch.

 

you have grinding noises....you need to pull the tranny to find out "why".

we can "guess" wtf the cause might be but whatever it is, pulling the tranny will be involved in fixing it

 

you have grinding noises....you need to pull the tranny to find out "why".

we can "guess" wtf the cause might be but whatever it is, pulling the tranny will be involved in fixing it

 

If the trans is in gear (car sitting still) and clutch is disengaged the input shaft and its bearing along with all of the trans internals are not moving. The only 2 bearing moving at this point are the pilot bearing and the throwout bearing. Generally a bad throwout bearing makes noise when the clutch is engaged. That said, I bet theres an excessive amount of play between the pilot bearing and the input shaft causing the input shaft to actually bounce around inside the pilot bearing giving what sounds like a grinding noise. If this is the case, the end of the input shaft my be chewed up and need of a replacement.

 

Good explanation thank you. That makes sense except why didn't I have this issue when the car ran for 3500 miles with an old reused GUTTED pilot bearing?It's weird that a fresh pilot bearing would cause this issue if there is no longer any play in the input shaft? Anyways, trans will be dropped in a few days and I'll find out whats up.

 

Ok so I'm updating this with my current strange situation. Car has still not been looked at. Mechanic has a small shop with only one lift. He just got a new one and can't have any cars on it till it gets inspected so we're waiting on that unfortunately.

Anyways the grinding has gone from being so bad I was about to have the car towed 30 miles home Friday of last week, to slowly dwindling away to where today I drove the car all day around town and not one single grind. Can anyone explain this? Maybe something with the throwout bearing or input shaft got stuck and then unstuck on it's own?

Also, I now have pedal vibration at the top of it's travel. When it's pushed in only about an inch like as if the pressure plate bolts are loose. But, I've experienced the pedal vibration due to loose pressure plate bolts before and it vibrated at ALL times when the clutch was pushed in just a little. In my current situation though it only does it once the car is in motion. At a stop whether in neutral, or in any other gear there is no pedal vibration whatsoever. Anyone have a clue whats up? Is this normal?

 

Jeeze no one?