The Official 356Talk Forum

I dug these pieces out of a box of parts I bought. ID is 50mm. OD is 60mm. Each is .5mm thick. I am guessing they are VW shims? Can I use these to measure flywheel end play before I buy a new shim?

Our original flywheel and shim were lost in shipping. So unless these work, I’m left to buy a new shim just to check the end play.

Do they match the diameter of the #1 main bearing? 36 hp vw shims would, later ones will be too large diameter.

Martin Benade wrote: ↑Sun Dec 01, 2019 5:02 pm Do they match the diameter of the #1 main bearing? 36 hp vw shims would, later ones will be too large diameter.

The ID appears to be the same. The OD of the bearing is larger.

Those should work then for measuring.

A slight correction of flywheel shims;

All shims--including the thick S90, have 49mm ID x 65mm OD, except the S90 which has its 70mm OD to suit its
larger flanged 2-piece main bearing.

Dick, that is confusing. Could you clarify it?

Dick Weiss wrote: ↑Tue Dec 03, 2019 10:19 pm A slight correction of flywheel shims;

All shims--including the thick S90, have 49mm ID x 65mm OD, except the S90 which has its 70mm OD to suit its
larger flanged 2-piece main bearing.

Seems clear enough.

It’s been a while, s 90 has both a thick shim and a thin one used together?

Martin Benade wrote: ↑Wed Dec 04, 2019 10:54 am It’s been a while, s 90 has both a thick shim and a thin one used together?

No; just one thick one. I have used a thick AND a thin on a S-90 when the correct thick one was not available. You have to be sure to install the thin one on the flywheel side!

Thanks. I was confused because Dick gave both diameters for the S 90 shim

Martin Benade wrote: ↑Wed Dec 04, 2019 11:10 am Thanks. I was confused because Dick gave both diameters for the S 90 shim

He posted that all the shims were the same ID and that the S-90 had a larger OD.

Vic Skirmants wrote: ↑Wed Dec 04, 2019 11:00 am No; just one thick one. I have used a thick AND a thin on a S-90 when the correct thick one was not available. You have to be sure to install the thin one on the flywheel side!

When referring to a S-90 specific shim, is its use dictated by the case, crank, flywheel, or bearing?

We have a S-90 case, with 356C / 912 crank, 200 mm flywheel, and single-piece #1 main bearing.

Vic Skirmants wrote: ↑Wed Dec 04, 2019 11:00 am You have to be sure to install the thin one on the flywheel side!

Why?

Dick:

It might be a bit clearer if you said "All shims have 49mm ID x 65mm OD, except the S90 which has its 70mm OD to suit its

larger flanged 2-piece main bearing. "

Not being critical and I want you to know that I appreciate all of your substantial contributions and enjoy reading your posts!

Michael Foster

Dennis; S-90 determined by crankshaft and bearing.
Bruce; the thin bearing has too small an OD to work with the S-90 bearing's larger flange.