Toasted Clutch?

[Diseazd]

Hogie....Install the throw-out bearing and measure the distance from the top of the throw-out bearing to the top of the fingers. If you get 16-18mm, you've got a 240Z collar. Now if you've got a 240Z clutch, you should be good to go. I can't imagine MSA sending you the wrong collar if you told them 240Z. Those guys all know Z's inside and out. Guy

[Carl Beck]

When the 240Z's first came out - the Pressure Plate Assemblies were thick or tall - depending on how you look at it. So the throw-out bearing collars were short. The distance from the clutch mounting surface {on the flywheel} to the top of the pressure plate "fingers" was just over 2".

As the years past - and the 280Z's came out - the pressure plates used in them were thinner or shorter - so the throw-out bearing collars were longer.

Over time - the original stock of 240Z pressure plates were depleted - and Nissan then used the 28Z pressure plates as "Factory Replacements" - and they superceded the parts numbers accordingly.

The result was that if you ordered a "240Z" clutch - you actually received a 280Z clutch as a replacement. That is when most of the trouble related to having the wrong throw-out bearing collar started. Most of the better Nissan Parts Countermen knew of this situation, and they would recommend getting a new throw-out bearing collar that matched the newer clutches {pressure plate assemblies}.

Bottom line is that until you measure the hight of the pressure plate fingers - you don't really know what pressure plate you have - 240Z or 280Z.

With a throw-out bearing collar that looks that short - you better have pressure plate fingers that are a least 2 to 2 1/16th inch from the mounting surface.

As Guy suggested - measure the collar height - and measure the height of the fingers on both Pressure Plate assemblies you have.

FWIW,

Carl B.

[Zed Head]

In Post #26 hogie said 1 3/4" pressure plate height. But I think that is the new one. Maybe. He said he had ordered one from NAPA.

hogie, right now your only point of reference is your old collar and your old pressure plate. If you measure those, you'll know your starting point for comparison. So far, I don't think that you have told what the old parts actually measured, beyond the picture of the collar and the tape measure.

It would be great if you could measure the old stuff, so that there would at least be confirmation of something that didn't work OR maybe it would point at the slave cylinder and rod. Then compare it to the new stuff.

My two examples above, Post #27, give a range of 3 3/8 to 3 13/16" for the height from the bottom of the pressure plate to the top of the ears on the collar, combined. That would be everything that fits between the fork and the pressure plate fingers. These two measurements both worked, one 1 3/4" and one 2" pressure plate, same collar.

This comes up all the time but rarely are any measurements reported.

Overwhelmed yet?

Edited February 19, 2011 by Zed Head

[hogie]

I haven't got all of the new parts in yet. When those do arrive I can get measurements of everything.

New collar measurements are as follows. From the edge of the fork connection to the first machined edge it is 18mm. From the fork to the end is 33mm.

The collar already on the car was ~26mm. The old pp was at 2"

MSA said this one will work with the 240 cluch and pressure plate that is on the way.

[Diseazd]

Super.....You"ve got a 240z collar (18 mm).........now when you get the 240Z pressure plate and disc (2 inch fingers), you should be able to bolt her up!

[hogie]

I have finally got the chance to put everything together. MSA sent me an Exedy clutch (NSD-004) and PP (NSC-580) assembly as well as a nice throwout bearing from Koyo (RCT 4075-1S 70172 FGGUN).

It shifts fine, but the spare tranny probaly has bad input bearings. There is alot of whirring when shifting from 1rst to second. It also makes a spinning sound when in neutral and the clutch is released.

I have 2 other spares, but 1 had a metal chunk stuck to the drain magnet and the other had water in it and light surface rust on the gears. Lucky Me!

At least the car ran good for its first trip of the year.