series clutch question

[alaskantinbender]

Driving in 4th gear and under hard acceleration will cause the engine rpm to race
feeling like clutch slippage. At slower speeds no problem. No burned plate smell like I would suspect but it must be a week pressure plate. The clutch plate and throw out bearing where replaced about 6,000 miles ago when the 2.8L ACR high performance engine was installed buy the previous owner.
The clutch pedal has about 1/2 to 3/4 inch play before applying pressure to the throw out bearing, seems normal.
is the normal clutch friction point up high on the pedal travel or should it be
lower near the floor?
Any helpful hints or did I miss something?
Maby its just too much power with the new Engine....

Thanx guys, great forum

Jim

[I Leak Oil]

Perhaps the slave cylinder adjustment is out or the clutch pedal adjustment? Maybe it's just a bum clutch.

[SafeAirOne]

Is there anything leaking onto the clutch friction surfaces?

[busboy]

There is only one way that engine speed can increase without road speed and that is to either be in neutral or the clutch IS slipping. You don't say if it's a 9 inch or 9 1/2 inch clutch you have. I would pull it apart before you ruin the flywheel, the clutch disc is already toast. Measure the clutch and make sure it's a 9 1/2 inch. I would machine the flywheel and use a new pressure plate and clutch disc. The old Ford 1/2 tons with a V8 used that 9 1/2 inch clutch so it should take the power you are trying to feed to it.

[alaskantinbender]

There is only one way that engine speed can increase without road speed and that is to either be in neutral or the clutch IS slipping. You don't say if it's a 9 inch or 9 1/2 inch clutch you have. I would pull it apart before you ruin the flywheel, the clutch disc is already toast. Measure the clutch and make sure it's a 9 1/2 inch. I would machine the flywheel and use a new pressure plate and clutch disc. The old Ford 1/2 tons with a V8 used that 9 1/2 inch clutch so it should take the power you are trying to feed to it.

I dont know if its a 9 or 9.5 but I checked all the clutch adjustments from the book and its all in spec. Took it out for a spin on the highway and no slipping at all today. Cruised up to 65MPH no problem. Tried to slip the clutch accelerating and decelerating hard in 3rd and 4th all is good. Kinda strange but I was pushing the truck probably a bit hard off road the other day. Has any one experienced a heat induced clutch problem in the past? Possibly expanding fluid in the clutch system?
I guess one lesson learned is to not push my 50 year old truck quite as hard off road.

Thanx for the help

Regards

Jim

[busboy]

The burn point for the organic lining on the clutch is around 550deg, if it was slipping that temp could easily be reached, like I mentioned the 9 1/2 inch organic clutch should easily be able to handle the power you are feeding it if everything is ok, (flywheel, pressure plate and adjustment) If after doing the steps I mentioned and you still have problems there is always ceramic linings which will go to around 1100 deg.

[alaskantinbender]

Thanx for the help guys. If it acts up again it will get a new ceramic disc and pressure plate. Is there any way to tell what size clutch with out taking it out of the truck?
From what I have read so far both can be interchanged. My transmission is full syncro with the clutch slave on the right hand side with the later style bracket.
I think that makes it a series 3 trany??

Thanx again

Jim

[SafeAirOne]

My transmission is full syncro with the clutch slave on the right hand side with the later style bracket. I think that makes it a series 3 trany??

By right side, do you mean "left"? Vehicle position is always described in terms as if you're sitting in the vehicle, unless noted otherwise (or you're in the UK and use the terms "nearside" and "offside" so the enemy can't be sure of what side is being referred to, should they intercept and decode the message).

Anyhow, if it's on the left, then yes, you are describing a SIII transmission.

[alaskantinbender]

By right side, do you mean "left"? Vehicle position is always described in terms as if you're sitting in the vehicle, unless noted otherwise (or you're in the UK and use the terms "nearside" and "offside" so the enemy can't be sure of what side is being referred to, should they intercept and decode the message).

Anyhow, if it's on the left, then yes, you are describing a SIII transmission.

Its on the right side of the trany.(from sitting in the truck) I expected to see it on the left as its a 1963 left hand drive series 11A 109.

Jim

[I Leak Oil]

Sounds like a SIII transmission with a IIa bell housing. Really doesn't matter if it's a 9" or 9 1/2", it shouldn't slip under the might of a 2.25L rover engine. If it's all adjusted correctly and the linkage is moving the way it should you probably just have a worn or contaminated clutch and the only thing you can do is take it apart and replace it. If so, just go with a 9 1/2" regular clutch. There is really no need to make it any more complicated.

[alaskantinbender]

Sounds like a SIII transmission with a IIa bell housing. Really doesn't matter if it's a 9" or 9 1/2", it shouldn't slip under the might of a 2.25L rover engine. If it's all adjusted correctly and the linkage is moving the way it should you probably just have a worn or contaminated clutch and the only thing you can do is take it apart and replace it. If so, just go with a 9 1/2" regular clutch. There is really no need to make it any more complicated.

Yep, I agree. I take it the 9 or 9.5 is interchangable then. I will order the 9.5 with a new pressure plate and throw out bearing to change during my next brake from work.

Thanx

Jim

[SafeAirOne]

Note that if you have a SIIA clutch actuating mechanism, the pressure plate is a bit different than a SIII pressure plate:



versus:

[I Leak Oil]

A picture of your slave cylinder or mechanism would be helpful to determine what you have. The IIa slave is normally on the right of the transmission where it operates a cross shaft going into the bell housing. The SIII slave is normally on the left of the transmission.

[busboy]

When I replaced my 2a trans with the ser3 I used the 2a clutch and bell housing and it worked like that for many years. Last year I changed out the clutch, pressure plate and machined the flywheel, the pressure plate was a ser3 so I stuck it together bled the system and it operates with no problems. So while the ser2a pressure plate has the rub piece so long as the throwout/release bearing is in good condition and is bled up it doesn't make any difference which one you use. I should add that a 9 1/2 inch clutch has considerably more surface area than a 9 inch. Also if you plan of resurfacing the flywheel then it's a good idea to change out the starter ring gear at the same time if it's original.