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pressure plate problems

70 gmc with 383 stroker

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70 gmc with 383 stroker Enthusiast

70 gmc with 383 stroker

Posted
Posted

Hi there all. I have a question for all... I have just redone the engine for my truck and I have replaced the clutch plate though have retained the previous pressure plate without machining it. The new clutch plate is 3/16 larger in diameter from the last... I would assume would be the identical thickness...

 

After bolting and torquing the pressure plate to a new ring gear I noticed that the fingers (which there are only 3 on this pressure plate) move in a fair amount. I would say over 1/2 inch? however now the adjustment for the clutch is WAY out. It isn't over adjusted, it's under adjusted. I know that a thrust bearing can be eaten rather quickly if this is messed up. I do not have much pedal play @ all and I am not going to be doing trial and error and replace the bearings etc... Any idea's?

 

by the way the clutch plate is an 11 inch clutch plate I beleive. farmer 4 tranny

snoman Senior Enthusiast

snoman

Posted
Posted

When you replace the clutch, it will change the pedal height depending on clutch thickness. Did you have throwout bearing properly seat in holder? Also, it should be a 12 inch clutch if it originally came with a 4 speed. Try readjusting it and see how it works.

70 gmc with 383 stroker Enthusiast

70 gmc with 383 stroker

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11 and 13/16 I beleive is what it measured out to be... as per adjustment I realize that when the old clutch was taken out that would leave one to beleive that the new clutch would be over adjusted so that it would have tension on the pressure plate @ rest, however this is not the case and there isn't enough adjustment left on the rod that is connected to the linkage. I have replaced clutches before and haven't come across this. The real problem that I think it is is how much the fingers compress when the pressure plate is bolted to the ring gear.... have you noticed that the fingers compress a bunch when the clutch is bolted... when I have the clutch adjusted to the end of the rod there isn't just the nice release that I can feel through the pedal. It feels very stiff and had already eaten a thrust bearing the first time. it certainly doesn't feel proper right now.

70 gmc with 383 stroker Enthusiast

70 gmc with 383 stroker

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  • Author
Posted

no I haven't replaced the pressure plate... the engine used to be a 350... now it's a 383 being externally balanced... the only change to the system was teh clutch plate... same pressure plate... I have installed everything properlly, though question that I have been asking is whether or not the pressure plate fingers are supposed to move towards the ring gear very much when bolting the pressure plate on ...

snoman Senior Enthusiast

snoman

Posted
Posted

How much retraction there would depend on the plate design and clutch thickness but a range of 3/8 to 5/8 " or so would be reasonable. You got me thinking, I have worked with 400 small blocks a lot in past and even 383 (350 crank in a 400 block, the opposite of what you have) but they were all automatics. I am now thinking that something is not correct with flywhell height of thickness because of this you changed the compression height on clutch and length of linkage needed to actuate it. (I should have caught this sooner sorry) What flywheel did you use here as chevy never offered the 400 SM (your stroker crank) from factory with a stick.

snoman Senior Enthusiast

snoman

Posted
Posted

Something is different here because compression height has changed and it has to be flywheel and crank assembly. There is nothing else I can think of. Your flywheel/crank combo is not the correct height/thickness for your current clutch setup. I have never done a stick with a 400 SM or crank. Was truck originally a manual tranny?

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