T-Series MGA pressure plate verses MGTF pressure plate?

[PAUL161]

When installing High Gears T9 5 speed I installed a different pressure plate, which I think is from an MGA. Does the MGA pressure plate have stronger springs? Is it the same configuration as a XPEG plate? Everything is new including the throwout bearing. The pedal pressure is stronger than the original that I replaced. If the engine is idling pushing on the clutch the rpms will drop 150 rpms. The pedal and linkage is adjusted properly but I have to push the pedal further down to get it to compleatly disengage. The original was very easy and smooth, the replacement is hard! I'm thinking of pulling the new one out and putting the original back in! PJ
Doc??

 

[NutmegCT]

Paul - while waiting for an expert opinion, you might be discovering that the "old" springs had lost some tension over the years, and could compress with less pressure than a new set of springs. So the new hardware takes more effort compared to the old hardware.

Just a thought.
Tom M.

 

[PAUL161]

Paul - while waiting for an expert opinion, you might be discovering that the "old" springs had lost some tension over the years, and could compress with less pressure than a new set of springs. So the new hardware takes more effort compared to the old hardware.

Just a thought.
Tom M.

Yes I considered that Tom, thanks. Found out that the MGA uses a hydraulic system same as the MGB which might make a manuel system harder to push if the pressure plate for the hydraulic system has stronger springs, hopefully someone who has been down this road will chime in.

 

[PAUL161]

Well I might have found the problem! MGTF pressure plate is supposed to have 150/160 spring pressure, the MGA pressure plate has 165/175 lb spring pressure, which the MGA has a hydraulic clutch to compensate. That being the case, I have the wrong p plate on my flywheel!
Just because a part looks the same and fits perfectally, dosen't mean it's correct! I wonder how many other times this mistake was made over the years.

 

[PAUL161]

Problem solved! I replaced the MGA pressure plate with the original and new retainer springs. My original plate was/is in fine condition but I though I would go with a newer pressure plate. Found that there two differences, the MGA plate has stronger springs and the face where the throw-out bearing rides on, stands more proud and forces the throw-out bearing back further in the bell housing causing the forks not to be centered vertically and creating an uneven throw against the bearing. Or something like that!

 

[DrEntropy]

Profuse apologies for not seeing this before now, Paul!

We would only replace a T-Series P-Plate with the specified-for-application one. Never went the five-speed conversion route, either. Grantura would likely have had better insight/experience with the T-Series.

 

[PAUL161]

Everything is cool now Doc, just waiting for some hardware to rebuild the center floorboard angles. Threads striped on a couple square nuts which I'll re-weld new ones in place and chase a couple buggered threads the rest. Have nuts coming and 3 BSF taps.