05-20-2022, 10:03 AM | #1 |
Blue 67
Join Date: Apr 2004
Location: Western WA
Posts: 1,179
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Pressure plate
How often a pressure plate goes bad? Or, how often a brand new pressure plate is defective?
I have swapped my clutch linkage with a hydraulic system (Hydromax from American powertrain) and my clutch doesn't engage. It seems everything is function as it should and throughout bearing is travelling about 0.5", so, Based on their tech advise (which by the way, their tech support could be a lot more helpful considering their product price tag), it could be the pressure plate which is brand new with the clutch kit.
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
05-20-2022, 10:24 AM | #2 |
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Re: Pressure plate
What’s the clearance between the tob and the fingers on the pressure plate?
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05-20-2022, 10:38 AM | #3 |
Blue 67
Join Date: Apr 2004
Location: Western WA
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Re: Pressure plate
It is about 0.15". Their recommendation is 0.15" to 0.2"
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
05-20-2022, 10:48 AM | #4 |
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Re: Pressure plate
So if the tob is pushing on the fingers correctly then my thought is you have the disc installed backwards.
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05-20-2022, 05:17 PM | #5 |
Blue 67
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Location: Western WA
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Re: Pressure plate
I guess there is only one way to find out!
It seems all the roads are point toward me taking the tranny off, the last thing I wanted to do
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
05-20-2022, 06:37 PM | #6 |
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Re: Pressure plate
Depending on pressure plate style sometimes you can see inside to the plate and see if you can see the disc’s springs pointing to the back.
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05-21-2022, 10:53 AM | #7 |
Blue 67
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Location: Western WA
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Re: Pressure plate
Thanks.
It seems I have to remove the tranny regardless since I have to check everything anyways, again!
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
05-21-2022, 11:08 AM | #8 |
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Re: Pressure plate
Perfection takes time!
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05-22-2022, 10:29 PM | #9 |
Blue 67
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Location: Western WA
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Re: Pressure plate
Well, I removed the tranny. Before I took the clutch set off, I rechecked my bearing Clerance and it was at 0.17. What I don't see is any marking on the fingers of pressure plate where the throughout bearing touches them. I know it is a new clutch set and system, but I expect to see some marking where the throughout bearing touches the fingers since the bearing was moving about 0.5" when the pedal was pressed. I took the clutch set off, it was installed correctly so, I am still in dark. I guess I need to research what a defective pressure plate is and how to test it.
__________________
1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
05-22-2022, 11:08 PM | #10 |
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Re: Pressure plate
Pardon my ignorance but what does the tob bolt to?
The bellhousing or the trans? I would think if you took the pressure plate to a machine shop they could put it in a press to see how it’s working. You got any pics. |
05-23-2022, 12:31 AM | #11 |
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Location: Colfax-California
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Re: Pressure plate
I think the bearing has to move than 1/2''. Looking at my 68 (although mechanical linkage) it moves at least an inch or more. I'd recheck for air in the system
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05-23-2022, 09:52 AM | #12 | ||
Blue 67
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Location: Western WA
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Re: Pressure plate
Quote:
I do have a small press and I can see the pressure plate's disc moves up and down when I press it even 3/8" or less. In the picture below, you can see the TOB (blue) was moving forward (the silver area between the blue TOB and darker silver area which are the spacers over the input shaft). I just don't know if it was putting enough pressure over the pressure plate fingers since I don't see any marking on the fingers. You think there would be some scratch marks when two metals push on eavh others. I am confused! Quote:
I am going to call them again, although I've never been able tog et hold of anybody!
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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06-04-2022, 02:35 PM | #13 |
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Re: Pressure plate
Did you get this figured out?
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06-04-2022, 10:42 PM | #14 |
Blue 67
Join Date: Apr 2004
Location: Western WA
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Re: Pressure plate
Still working on it.
I have taken the tranny and clutch out to be be sure I have not installed anything wrong, which I didn't (sometimes you wish you did, that would make it easier!). I tested the pressure plate on my basic press. It seems the fingers are moving within 0.3 to 0.5 inches. I am thinking the Hydraumax bearing is not travelling far enough (it seems it suppose to travel 0.4") to press the fingers. I ordered a ram hydraulice bearing which has up to 0.8" travel time. We'll see! I guess the short answer is "no"!
__________________
1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
06-16-2022, 01:31 AM | #15 |
Blue 67
Join Date: Apr 2004
Location: Western WA
Posts: 1,179
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Re: Pressure plate
So, I have taken this transmission off 3 times so far. I replaced the TOB with a Ram brand which has more travel. Finally, after many bleedings, my clutch engages well, but now, I have a leak inside the bellhousing which I don't know where it comes from. I am assuming it is leaking from the bearing. I am keeping eye on the fluid to see if it is going down. I used teflon tapes (per Ram instruction) to seal the fittings.
At least I can drive the truck for now.
__________________
1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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