Backlash After Heavy Duty Clutch Install

[XGTRX]

Just hoping for some light on the subject.

Had a worn standardish clutch that was replaced with a single plate heavy duty thing and I have noticed:

1. A fair bit of backlash in the drive train.

2. Hard to put it into 1st when stopped as i have to let the car roll a bit to get it in gently

3. A change from 1st to second is a bit hard

4. Drive train backlash when going slow in a car park where I have to ride the clutch a bit.

5. Noticed backlash when on and off throttle esp in 3, 4, 5th gears.

Never had any issues prior to the clutch being installed and I was told the fly wheel (standard) was in good nick so it wasn't changed.

Gearbox is perfect.

No diff or drive train noises or whines.

So asking for advice to remedy the situation.

Thanks

[MrStabby]

If the take up point is close to the floor, adjust it higher and see if that helps with 2 and 3.

What do you mean by backlash?

[XGTRX]

If the take up point is close to the floor, adjust it higher and see if that helps with 2 and 3.

What do you mean by backlash?

backlash as in a hammering of the drivetrain. Back and forth hammering when driving in a carpark. As if the driveline has slack in it. Also notice it when cruising if i come off throttle suddenly.

[GH05T]

diff sounds f**ked

[XGTRX]

nope it was perfect before the clutch install. no whining no noises.

Is it possible that the clutch install with old flywheel could be the problem?

[GTSBoy]

What type of clutch? Could be relevant to my interests if it turns out to be the same brand as I have.

[XGTRX]

What type of clutch? Could be relevant to my interests if it turns out to be the same brand as I have.

not sure mate it was just a heavy duty single plate that was re-done by a local bloke that owed a mate a favour..... ha ha that may be the problem maybe

[Dose Pipe Sutututu]

A fly wheel would not cause any of those issues.

Possibly a few loose bolts or the gearbox mount not bolted back correctly.

Have a look at those first then check to see if the bolts on the tail shaft are tight too

Also are you using a sprung centre disc or solid?

[XGTRX]

I will have a check. cheers

[XKLABA]

Anyone thought about the springs in the actual clutch plate being to soft and what feels like "backlash" is actually the centre spline turning inside the friction plate ?

[GTSBoy]

As of the start of this thread, yes, that was pretty much what I started to wonder. Hence why I asked what sort of clutch the OP had to see if it was same as mine and if perhaps my backlash problem might originate there.

[V28VX37]

As of the start of this thread, yes, that was pretty much what I started to wonder. Hence why I asked what sort of clutch the OP had to see if it was same as mine and if perhaps my backlash problem might originate there.

Interesting, some of the 'slack' in my driveline was remedied by changing the diff bushes but it's still often noticeable on gear change. I've got an NPC 10" HD organic (p/n NPC7333HD-10") with an R34 GTT gearbox. Which clutch are you running?

[GTSBoy]

Extreme heavy duty of some sort. Initial one was on my RB20 and it did something unpleasant tto itself after some years of use (without complaints too, I might add). Extreme did a partial warranty on it and the new one was a bit different. Went onto the RB20 and then got carried over onto the Neo. The backlash in my driveline goes back to the RB20 days, and the clutch is the only common component between the engine and the rear hubs.

[Hadouken]

The backlash I think you are talking about is probably the clamp rating on the clutch. Do you know if it is a sprung button?

Also with your problems of engaging first gear, did you try and bleed the clutch?

[V28VX37]

Extreme heavy duty of some sort. Initial one was on my RB20 and it did something unpleasant tto itself after some years of use (without complaints too, I might add). Extreme did a partial warranty on it and the new one was a bit different. Went onto the RB20 and then got carried over onto the Neo. The backlash in my driveline goes back to the RB20 days, and the clutch is the only common component between the engine and the rear hubs.

Ok, different clutch then.

Also AFAIK the NPC 7333HD is a rebranded Exedy NSK-7333HD, same product. Both are pull type for the R34 box.

[GTSBoy]

The backlash I think you are talking about is probably the clamp rating on the clutch. Do you know if it is a sprung button?

Um. Explain?

Ok, different clutch then.

Also AFAIK the NPC 7333HD is a rebranded Exedy NSK-7333HD, same product. Both are pull type for the R34 box.

Perhaps not. Extreme are Exedy too aren't they?

[Hadouken]

Only covering all bases here. Jumping off the clutch could be considered backlash. Internet is hard to diagnose haha

[GTSBoy]

fairies nuff.

[Hadouken]

So what's the deal here?

[MrStabby]

I'm not confident we all have the same understanding of backlash, so from Wikipedia "In mechanical engineering, backlash, sometimes called lash or play, is clearance or lost motion in a mechanism caused by gaps between the parts". In the diagram below as gears wear the backlash increases. I cant see how changing a clutch can effect backlash.