Clutch Help!

[Hawks]

So i replaced the clutch in my 60 c20. Im running a 305 with 3 speed overdrive. it has the original bellhousing with slave cylinder. i got a clutch kit for a 60 C20 and all the parts were the same. with a 10'' clutch, throwout bearing pressure plate ect. now when i have it in i can't get the clutch to disengage. When i look at the clutch disc with the clutch pushed in it has good space between the pressure plate and the flywheel. but cant get the clutch to move. I can make it move a little by putting a screwdriver in the drive shaft and makeing it turn but barely. and i checked the input shaft on the trans before i put it in to make shure it turned freely and it did. I really need the truck back on the road because its my daily driver. its driveing me crazy trying to figure it out. thanks for any info to help.

[padresag]

are you sure that you have it in the right way. is it a gmc 305 or a chev 305
ron

[1963c-10]

Did you bleed the clutch master cylinder? In my experience, Id say the throw out bearing was bad, but you said that you had replaced it. Id try bleeding the system personally.

[Hawks]

Its a chevy 305. I have bleed the slave cylinder and it seems to have plenty of travel. im going to try to just put the old pressure plate back on with the new clutch disc. it seemed ok before. just the old clutch disc was badly worn.

[tincan1966]

There's two different release(throwout)bearings, a tall and a short. Is what you installed the same as what came out?

[padresag]

""When i look at the clutch disc with the clutch pushed in it has good space between the pressure plate and the flywheel. but cant get the clutch to move. I can make it move a little by putting a screwdriver in the drive shaft and makeing it turn but barely""
actually, I think that your disc is in backwards. with the p/plate engaged a free space in there, the clutch disc should turn freely unless the trans is in gear. if it is in neutral the clutch should turn freely with the clutch(p.p) engaged. the reason why I asked whether it was a 305 gmc was that the c/disc is different than the one for a chev and will give you that effect.
if the p/plate is engaging when you push the pedal, then the system is working.
ron

[TBONE1964]

Did you machine the flywheel? This is a no no on a hydraulic clutch set up.

If you did and the machine shop took off to much material, you will also have the problem you describe.

Make absolutely sure it is bleed good. Is it hard to shift into first gear or will it even shift at all.

When you say "good space" how much space are you talking about?

[63burban]

Flip the clutch disc around

['63GENIII]

Id have to agree its backwards. Ive done it before too. The clutch should have some sort of " flywheel side" or other direction marking.
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[jocko]

Originally Posted by TBONE1964

Did you machine the flywheel? This is a no no on a hydraulic clutch set up.

If you did and the machine shop took off to much material, you will also have the problem you describe.

Make absolutely sure it is bleed good. Is it hard to shift into first gear or will it even shift at all.

When you say "good space" how much space are you talking about?

Tbone - could you elaborate? Why is machining the flywheel a no-no for a slave cyl setup? Would seem there is sufficient adjustability remaining even if a few thou is removed from the fly. What am I missin? Interested - was new news to me - thanks for posting that.

[63burban]

He means you can machine more material off the flywheel than the hyd throwout bearing can compensate for. It's a distance thing.
Check to see if the springs in the clutch disc are facing the rear, they need to facr towards the trans, not towards the engine.

[Hawks]

Well after i got it back togeather with the old pressure plate and got it working. i drove it around and had no problems. and when i took it apart it was in right. and i comparied the plates and saw no major differences. and i just sanded the pressure plate and flywheel before i put it back togeather. i think it was something with the slave cylinder. because the PO had a spacer plate on the bellhousing putting the clyinder foward an inch i dont know why. so when i had it togeather the first time i just took it off and bolted it to the bellhousing like it is suposted to be. then after that wouldn't work i took the plate and put it back on so it made the slave cylinder closer to the fork. i don't know why i had to its a new slave cylinder and i rebuilt the master cylinder months ago. but it works fine know. so thanks for all of yalls advice.

[jocko]

Originally Posted by 63burban

He means you can machine more material off the flywheel than the hyd throwout bearing can compensate for. It's a distance thing.
Check to see if the springs in the clutch disc are facing the rear, they need to facr towards the trans, not towards the engine.

I kinda figured that was what was meant - was asking because I can't possibly imagine a flywheel could be machined enough that release bearing travel would become an issue - this is only a slave setup, not an actual hyd release bearing. Intertesting.

[tincan1966]

The machine shop I use, supplies me with a flywheel shim that goes between the crank and flywheel if there is a significant amount removed.
BUT I have never seen a problem unless it is the hydraulic release bearing that is self contained inside the bellhousing. That's just my experience. I always machine the flywheel with a new clutch to remove hot spots and have a nice true surface for the new disc- it also reduces chatter.