Zx 5 speed rebuild

[Patcon]

Yes, with a gasket.

The original shim was .335 mm but we checked and believe we need .072 mm currently. Using the .335 mm shim locks the tranny up

[Patcon]

So we made a 0.005" shim and it locks the tranny up.

Then we made a 0.003" shim and it also locks the tranny up. It's fine with no shim. I am inclined to leave it out entirely...

@EuroDat

[heyitsrama]

@Patcon have you used a punch on the end of the counter shaft to make sure it’s all the way back?

I gotta do this tomorrow, waiting on plastigauge.

[EuroDat]

When you are calculating bearings, which is not an exact science, tolerances can effect bearing clearances. Too much interference fit etc and incorrect axial clearance.

The C3 clearance specification is a radial spec, but comes close to the axial movement in the deep groove single row bearing.

In this case you are in the 13 to 28um or 0.013 to 0.028mm range. The shim 0.003in is 0.076mm and that is binding the bearings. I would fit it without shims.

It is beter to have a little axial clearance than actually having a axial pre-load on the bearings. That would shorten the bearing life.

When you say "it locks the tranny up" you mean it makes it hard to turn and feels like a bearing is bad? It's not actually locking up and will not rotate at all.

ISO Bearing clearances.pdf

Edited September 11, 2022 by EuroDat
Added doc Iso bearing clearances

[EuroDat]

1 hour ago, heyitsrama said:

@Patcon have you used a punch on the end of the counter shaft to make sure it’s all the way back?

I gotta do this tomorrow, waiting on plastigauge.

Good point, but in Patcon's case he most likely pushed it back as far as it would go when he tried the thicker shim.

[Patcon]

3 hours ago, EuroDat said:

Good point, but in Patcon's case he most likely pushed it back as far as it would go when he tried the thicker shim.

This is what I figured too.

Too thick of a shim will actually make it impossible to turn by hand