Thick pressure plate, way too thick! My confusion.

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pete.v

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I received a 050014 aluminum hard anodized clutch pressure plate advertized as being .050" thicker than standard. I have measured my standard plate as .104 at the drive teeth and .225 over all. The one I got from RGM is .276 and .400 overall thickness. These measurement indicate .171 thicker than stock not .050. This is of course impossible to install.
Something seems amiss here. Has anyone else had this item?
Thick pressure plate, way too thick! My confusion.

Thick pressure plate, way too thick! My confusion.

Thick pressure plate, way too thick! My confusion.
 
Re: Thick pressure plate from RGM way too thick!

Boy, you may need to talk to them. I got a stainless magnetic gearbox drain screw that would not work from RGM. I had it modified locally for too much money. They should stand by what they sell. OB lists the standard 750 pressure plate at .225 and the 850 plate at .102 so you should have something to say.

Good luck.
DogT
69S
 
Re: Thick pressure plate from RGM way too thick!

DogT said:
Boy, you may need to talk to them. I got a stainless magnetic gearbox drain screw that would not work from RGM. I had it modified locally for too much money. They should stand by what they sell. OB lists the standard 750 pressure plate at .225 and the 850 plate at .102 so you should have something to say.
Click to expand...


The RGM item is listed correctly (OK 1 thou. out) as 50 over standard is .275".

050014 ALUMINIUM HARD ANODISED CLUTCH PRESSURE PLATE .050" THICKER THAN STANDARD, DESIGNED TO WORK WITH FIBRE TYPE CLUTCH PLATES, BELT DRIVES ETC, CONVERTS CLUTCH TO ONE FINGER OPERATION
Click to expand...
 
Re: Thick pressure plate from RGM way too thick!

L.A.B.,
I think you are on to something there. I missed that one. Guess it comes with the age and not paying attention.

BTW, I still have the 4 plate clutch, maybe we could make a deal??

DogT
 
Re: Thick pressure plate from RGM way too thick!

roughly, thick plate .347 +.050= not far off .400
thin plate .227 +.050= not far off .276

The thickness of the teeth on one plate and the overall thickness on the other is nearly the same, order the right plate or convert to a 4 plate clutch.
L.A.B. said:
I think perhaps your clutch has been converted to 5-plate spec . if it's got the "thin" pressure plate?

The standard .225" pressure plate is for the 4-friction plate 750 clutch.

http://www.oldbritts.com/ob_clutch_info.html
Click to expand...

I believe not, they are measuring the thickness of the teeth
 
Re: Thick pressure plate from RGM way too thick!

splatt said:
roughly, thick plate .347 +.050= not far off .400
thin plate .227 +.050= not far off .276

The thickness of the teeth on one plate and the overall thickness on the other is nearly the same, order the right plate or convert to a 4 plate clutch.
L.A.B. said:
I think perhaps your clutch has been converted to 5-plate spec . if it's got the "thin" pressure plate?

The standard .225" pressure plate is for the 4-friction plate 750 clutch.

http://www.oldbritts.com/ob_clutch_info.html
Click to expand...

I believe not, they are measuring the thickness of the teeth
Click to expand...

Yes.....so the thick plate is .225" + .050" = .275" (.2760" as measured) at the teeth.

750cc:
Friction plate is: 0.145”
Plain plate is: approximately 0.080"
Pressure plate is: 0.225”
Total clutch plate thickness (4 friction, 3 plain and 1 pressure) is: 1.045”

850cc:
Friction plate is: 0.121”
Plain plate is: approximately 0.080"
Pressure plate is: 0.102”
Total clutch plate thicknesses (5 friction, 4 plain and 1 pressure) is: 1.027”
Click to expand...


And you can't "order the right plate" as RGM don't sell a thin alloy pressure plate for obvious reasons.
 
Re: Thick pressure plate from RGM way too thick!

L.A.B. said:
DogT said:
Boy, you may need to talk to them. I got a stainless magnetic gearbox drain screw that would not work from RGM. I had it modified locally for too much money. They should stand by what they sell. OB lists the standard 750 pressure plate at .225 and the 850 plate at .102 so you should have something to say.
Click to expand...


The RGM item is listed correctly (OK 1 thou. out) as 50 over standard is .275".

050014 ALUMINIUM HARD ANODISED CLUTCH PRESSURE PLATE .050" THICKER THAN STANDARD, DESIGNED TO WORK WITH FIBRE TYPE CLUTCH PLATES, BELT DRIVES ETC, CONVERTS CLUTCH TO ONE FINGER OPERATION
Click to expand...
Click to expand...
OK LAB, I am going to give you a differant perspective.
Tell me what you see!
Thick pressure plate, way too thick! My confusion.

Thick pressure plate, way too thick! My confusion.
 
Re: Thick pressure plate from RGM way too thick!

pvisseriii said:
OK LAB, I am going to give you a differant perspective.
Tell me what you see!
Thick pressure plate, way too thick! My confusion.

Thick pressure plate, way too thick! My confusion.
Click to expand...


The upper photo appears to show a standard steel "thin" .227" overall (.102" at teeth .1045" your measurement) 5 bronze friction plate clutch pressure plate.

The second photo appears to show a .347" +.050" overall [.4005" your measurement] (.276" at teeth -your measurement) "thick" 4 fibre plate alloy pressure plate.
 
Re: Thick pressure plate from RGM way too thick!

L.A.B. said:
The upper photo appears to show a standard steel "thin" .227" overall (.102" at teeth .1045" your measurement) 5 bronze friction plate clutch pressure plate.

The second photo appears to show a .347" +.050" overall [.4005" your measurement] (.276" at teeth -your measurement) "thick" 4 fibre plate alloy pressure plate.
Click to expand...
OK, I think I am beginning to understand. This item is for a 750 clutch pack, not the 850 clutch pack? It would be nice if RGM would have mentioned that in the description. And if I want to use this, I will have to cut .080 to .100 off the face and loose the anodization?
Thank you,
LAB
 
Re: Thick pressure plate from RGM way too thick!

pvisseriii said:
OK, I think I am beginning to understand. This item is for a 750 clutch pack, not the 850 clutch pack?
Click to expand...

Correct! = it's meant to be used with the 4 fibre friction plate "750" clutch.



pvisseriii said:
It would be nice if RGM would have mentioned that in the description.
Click to expand...

But it states quite clearly that it is : "DESIGNED TO WORK WITH FIBRE TYPE CLUTCH PLATES"



pvisseriii said:
And if I want to use this, I will have to cut .080 to .100 off the face and loose the anodization?
Click to expand...

If you intend to thin it down in order to run it next to a bronze plate with the 5 plate setup then that will probably wreck it.

The alloy plate is only intended for use with fibre/fiber plates as the pressure plate is the last "plain" plate in the clutch plate stack.
 
Re: Thick pressure plate from RGM way too thick!

I never said I had a bronze setup.
I have five fiber plates(Barnet), .120, and four plain, .080. Hence the confusion.

[Sorry, I deleted part of your message by mistake - L.A.B.]
 
Re: Thick pressure plate from RGM way too thick!

pvisseriii said:
I never said I had a bronze setup.
I have five fiber plates(Barnet), .120, and four plain, .080. Hence the confusion.
Click to expand...


Yes, it could have saved much confusion if you had mentioned that at the start, as a Barnett 5-plate fibre clutch is not a standard item, and you can hardly blame RGM for not knowing your clutch plates are a non-standard set.
 
Re: Thick pressure plate from RGM way too thick!

You could try removing a clutch plate?
 
Re: Thick pressure plate from RGM way too thick!

L.A.B. said:
pvisseriii said:
I never said I had a bronze setup.
I have five fiber plates(Barnet), .120, and four plain, .080. Hence the confusion.
Click to expand...


Yes, it could have saved much confusion if you had mentioned that at the start, as a Barnett 5-plate fibre clutch is not a standard item, and you can hardly blame RGM for not knowing your clutch plates are a non-standard set.
Click to expand...
It is hard to think that in this day that any clutch would be stiil be standard or that most all 850 are still with bronze plates.
Anyways, The last part was if the non anodized surface would be ok against fiber plate.
 
Re: Thick pressure plate from RGM way too thick!

I've got a 750 clutch pack set that should work with your "new" RGM plate. Perhaps your willing to trade all your other plates for mine ???
 
Re: Thick pressure plate from RGM way too thick!

pvisseriii said:
It is hard to think that in this day that any clutch would be stiil be standard or that most all 850 are still with bronze plates.
Click to expand...

I think there are certainly many Commandos-especially 850s that still have a standard bronze 5 plate clutch (as mine has) as they never seem to wear out, but you miss my point that a 5-fibre plate clutch kit is not the usual replacement for either the original 4 plate clutch or 5 bronze plate clutch.



pvisseriii said:
Anyways, The last part was if the non anodized surface would be ok against fiber plate.
Click to expand...

Anyone's guess, I think?
 
Re: Thick pressure plate from RGM way too thick!

If i have worked this out correct you should be able to run 4 fibre plates,and 4 steel plates, 2 together, and that should give you the correct stack height, if the barrnett plates are .125 thick
 
Re: Thick pressure plate from RGM way too thick!

I thin mine down a bit more and put a plain steel plate as the last plate so that there is no wear on the ally pressure plate. Prior to that the fibre plates did tear up the pressure plate
 
Re: Thick pressure plate from RGM way too thick!

This thread exemplifies why I do NOT like old brits clutch misinformation.
I have offered the correct information in my article. (Which pre dates the OB article by many years)

http://atlanticgreen.com/clutchpak.htm

simple
"thick" or "thin" clutch

early ...4 "thick" friction plates and "thick" pressure plate
late ....5 "thin" friction plates and "thin" pressure plate

especially noted is you must use the FULLthickness of the pressure plate
You can NOT intelligently discuss clutch stack height unless you do....why?

because the FULL stack height is what fills the space from the backing plate out to the diaphragm. :roll:
 
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