new clutch slipping

[3.0 GT]

hey, my clutch was slipping recently so i pulled it to fix it. i got the clutch redone at a local shop and i had them resurface my flywheel and pressure plate too. i told the guy that the clutch area that bolts up to the flywheel needs to be machined too to make up for the material taken off the flywheel and pressure plate surface but he was like no, no,no so i didnt argue with him. they took quite a bit off of the flywheel(rps segmented) because it was warped. well i threw it all back together and what do u know slips without even 1psi of boost. so i had to pull that shit BACK OUT! by now im a tranny removal pro lol. so who is right? me saying the pressure plate bnolt area needs to be milled or the clutch guy who caused me to pull my tranny AGAIN? thanks guys
action stage 3 clutch from dm btw.

edit: this is the area i think needs to be milled. the new clutch disk protrudes maybe 1mm over the surface of those bolt areas and the flywheel surface is about .7mm over its mounting area.

 

[ians13]

I run fadanza lightweight flywheel and the clutch contact area is slightly higher than the rest of the flywheel surface. i think your flywheel is out of spec, and may need to be replaced. also check the clutch pedal free play.

 

[Suprapowaz!(2)]

I don't think your pressure plate is supposed to be machined. What you're experiencing is the reason for that.

 

[Poodles]

No, pressure plate is not machined, the backstep on the flywheel is.

RPS segmented flywheel is NOT supposed to be machined, you replace the insert instead (same with any of the other aluminum flywheels with steel insert)

 

[Suprapowaz!(2)]

He said he had them resurface the flywheel and pressure plate too. That's why his clutch disc sunk in his PP, and now he wants them the mill down those bolt areas down that's pictured. Unless I misunderstood his post he did have them resurface the PP contact area.

 

[Poodles]

That's never done, it would be foolish to do that...

 

[3.0 GT]

He said he had them resurface the flywheel and pressure plate too. That's why his clutch disc sunk in his PP, and now he wants them the mill down those bolt areas down that's pictured. Unless I misunderstood his post he did have them resurface the PP contact area.

yes i had the pp resurfaced but barely any material was removed from that. the clutch guy told me it needed to be done, the flywheel, they do not make anymore and i didnt know where to get new inserts for it so i just had it machined flat. so what should i do without buying a new flywheel? can i have the bolt areas machined lower? it doesnt seem like it would cause any problems.

 

[Poodles]

Ugh, no, you don't machine the pressure plate, you replace it.

Flywheel, if you can't replace the inserts, it's junk...

 

[BrandonW]

i purchased a new oem clutch from dm a while back disk, pp and bearing

im going to have my flywheel to be machined do i have something to worry about or am i fine since i didn't have any machining or anything done to the pp

 

[hvyman]

your fine. when i replaced my clutch+ tranny had the fly machined and boy is that sucker worn out. the clutch surface is just barley above the mounting surface. no probs witha 57 trim at 7-8 psi so far with about maybe 5k miles( i dont race or red line). that was with stock disc and a reman pp.

 

[3.0 GT]

your fine. when i replaced my clutch+ tranny had the fly machined and boy is that sucker worn out. the clutch surface is just barley above the mounting surface. no probs witha 57 trim at 7-8 psi so far with about maybe 5k miles( i dont race or red line). that was with stock disc and a reman pp.

damn, i cant afford to buy anything right now, are there any other cheap options? could i machine the flywheel to make a lip?

 

[Poodles]

If it's a stock flywheel, they machine the backstep as well...

If the backstep is not machined it WILL slip (know from experience)

 

[Poodles]

Honestly, should have taken it back to the shop if you don't have the cash to fix it correctly as it's THEIR screwup at this point...

 

[BrandonW]

If it's a stock flywheel, they machine the backstep as well...

care to post up a picture or something of what part that is lol i don't have it in front of me atm?

 

[Poodles]

Properly machined flywheel as you can see from the tool marks(backstep is on the outside, the pins need to be pulled to do it, but they should have the tool)

 

[BrandonW]

thanks, ok i see, and that should not vary in height from the rest of the flywheel?

somewhat off topic but reminds me of that pin on the block surface, same thing?

 

[hvyman]

the pressure plate mount location to clutch surface on the flywheel has direct action on how the clutch will hold.(if you can get that-my brain is losing my thoughts as i type sorry).

think of it this way: the more you machine of the clutch surface the less tension you have from the pressure plate and the less it will hold. but if you machine the pp mounting surface on the flywheel down the surface for which the clutch sits on gets raised and makes up the difference.

the block is different as if you machine it too much the pistons will eventually hi the head or the valves will hit the pistons.

EDIT: all this can only be machined so much as the the input shaft has only 1 length. also stock flywheels are cheap(used). dont recall what a new flywheel costs.

 

[Poodles]

The outside ring is lower than the center ring. Hence why if you just machine the actual surface the clutch uses (the inner part) you'll be loosening the clutch assembly. They're not on the same level.

 

[IJ.]

2mm step

 

[hvyman]

thats what i was taking about(so i tought i was typing- agreeing with you.) but a flywheel can only take so much machining.

my flywheel is about done if i ever go threw another clutch as i would guess that its about 2-3 finger nails thick( wish i measured it) and even my machinist said holy f@#$ this thing is worn to shit but it still works great for MY power. as buying a new stock flywheel is about 300$.

i still dont trust my clutch to go for power and never will i am only saying that for stock or mild mods(sub 300hp/tq) that it should be fine. if going for power engine+drive train should always be in mind.