| Author |
 Topic  |
|
LewPalmer
USA
3247 Posts |
 Posted - 24/04/2022 : 20:13:55
|
The early clutch disk and 12 new clutch springs solved the problem. I believe the clutch springs that came with but not installed were coil binding. The new S&V springs solved the problem.
I am again in need of a clutch driven disk (the earlier thinner one) for a PA or NA. The disk I have is too thick and will not allow the clutch pedal to be depressed. It cannot be converted as it is of a very different configuration. In an attempt to make it work, I shimmed out the clutch cover from the flywheel and that allows the pedal to be depressed, but it does not allow the flywheel cover to completely close up to the bell housing.
Anything considered, new or used, needing relining or not.
Lew Palmer
PA1169, 2M1281, NA0651 |
Edited by - LewPalmer on 14/09/2022 22:01:04 |
|
|
george
United Kingdom
863 Posts |
Posted - 24/04/2022 : 20:33:46
|
| Lew, how thick is your existing plate ?I have used various thickness plates and all work fine after adjustment. Geoff |
 |
|
|
LewPalmer
USA
3247 Posts |
Posted - 24/04/2022 : 21:32:58
|
Mine is a mongrel - 3/8 thick. Without shimming the clutch cover to flywheel, it wont allow the clutch pedal to be depressed, even after adjusting the fingers to 3/16 spacing.
Lew Palmer
PA1169, 2M1281, NA0651 |
|
|
|
Justin Heal
USA
177 Posts |
Posted - 24/04/2022 : 21:45:30
|
| lew, i have a very worn one you are welcome to borrow to help trouble shoot if it helps, let me know, happy to run it over one afternoon this week? |
|
|
|
LewPalmer
USA
3247 Posts |
Posted - 24/04/2022 : 22:49:51
|
Thanks, Justin, but I need one of my own.
Lew Palmer
PA1169, 2M1281, NA0651 |
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 24/04/2022 : 23:29:06
|
[quote]Originally posted by LewPalmer
I am again in need of a clutch driven disk (the earlier thinner one) for a PA or NA.
Lew Palmer
I am confused; isn't the early one with the double fingers the thicker and the later with single fingers the thinner? |
|
|
|
LewPalmer
USA
3247 Posts |
Posted - 25/04/2022 : 01:44:24
|
Nigel, I am not aware of any difference between the early and late PA/NA clutches with regard to the fingers. There is certainly difference between the early clutch fingers on, for example the J2 and the later PA/NA cars. The early and late clutch plates to which I refer are documented in Service Sheet 24. The early clutch plate is 1/4, the later is 5/16 thick.
I have one that looks like an early plate, but is 3/8 thick, so cannot be adjusted. The center arms are too thick and there is not enough lining to be thinned.
Lew Palmer
PA1169, 2M1281, NA0651 |
|
|
|
george
United Kingdom
863 Posts |
Posted - 25/04/2022 : 10:36:47
|
| Lew ,the plate which was in my car until recent times is 3/8th . The one in at the moment I am reasonably sure is thinner ,maybe 5/16th . Are you sure that the plate thickness is the problem. There is quite a lot of adjustment available.Geoff |
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 25/04/2022 : 10:55:54
|
Lew, if you study the drawing posted by Oz34 in your earlier thread: https://www.triple-mregister.org/forums/topic.asp?TOPIC_ID=21030 which I believe comes from Service Sheet No 24, you can see that the early driven plate has multiple layers and the late a single layer of fingers.
As Dave said in his post: "it would seem the early plate is 5/16 and the late 1/4 inch"
I have both and have in the last 5 or so years had the late plate single finger plate re-lined and I think I specified a thickness of 1/4" at the time.
I think the multiple layers of fingers in the early plate dictate a thicker friction element. I will dig out my spare multi layered plate late and measure it's thickness. |
|
|
|
george
United Kingdom
863 Posts |
Posted - 25/04/2022 : 13:17:59
|
My Thick plate
|
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 25/04/2022 : 13:42:34
|
And mine with thickness.
|
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 25/04/2022 : 13:58:02
|
Possible solutions:
1) If you are unable to source a thin plate then you could remove the multiple layered fingers from your existing plate and rivet on a new single set of fingers to allow a thinner friction ring.
2) Alternatively if you are able to source another splined boss (see photo) you could have a ring of fingers fitted to that again allowing a thinner friction ring. This would allow you to sell your existing driven plate to recover some of the cost.
|
Edited by - coracle on 25/04/2022 14:00:39 |
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 25/04/2022 : 15:15:56
|
| 3) See if you can get hold of a later pressure plate to accommodate your thick driven plate. |
|
|
|
frederick wheeler
France
42 Posts |
Posted - 25/04/2022 : 15:37:59
|
Hi lew,
Are you using a late type thick pressure plate 0.850 approx, or an early thinner type 0.775 if so the you cannot use the early 3/8 thick disc (with the corks). The thickness of the pressure plates is not the only difference! The cross drillings on the later plate are about 1/8th further back from the friction face thus a combination of early disc and a later pressure plate give an impossible extra total distance. I will try to get a picture which would make this much easier to follow. I can probably help with what you need.
Fred
f wheeler |
|
|
|
LewPalmer
USA
3247 Posts |
Posted - 25/04/2022 : 16:38:16
|
I appreciate all the comments and suggestions, but the problem is easy to see.
The pressure plate is the earlier thickness at a bit under the specified .84375" and, assuming the springs do not coil bind, has a clearance between the back of the pressure plate and the cover of .365". Therefore, the driven plate needs to be less than .365" thick.
However, the driven plate thickness measures at .375" with pad thickness of .125" each. It is clearly the earlier style.
Thus, (again without coil binding) there is simply not enough room for the clutch to release.
There are several possible solutions:
1) Have the pressure plate ground to a thinner dimension (which I am loathe to do)
2) Replace the driven plate linings with the proper ones
3) Obtain a correct thickness driven plate (my preferred solution)
I haven't done the math to figure out what pad thickness would be required for proper operation, but question what the proper thickness should be.
Lew Palmer
PA1169, 2M1281, NA0651 |
|
|
|
coracle
United Kingdom
1967 Posts |
Posted - 25/04/2022 : 16:49:18
|
| Or replace the pressure plate with the earlier thin type to match the thick driven plate. |
|
|
|
Topic |
|
Forum Locked
Topic Locked
