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Old 05-10-2015, 12:12 PM   #1 (permalink)
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Default Clearance mainshaft and LSD

I'm currently rebuilding my s20 transmission and i was checking the clearance on the mainshaft.The ISB bearing actually sits 2mm in the case and the Mainshaft itself is Zero with the case.Is that normal ?( I installed the synchro hubs, spacer , bearing ,and the shim on top of the mainshaft)
Shim thickness was 1.05mm so that's correct.I actually tought the mainshaft was always a little below the case ?

When i checked the clearance of the MF LSD it was a little on the loose side.
0.15mm or 0.006" .Oem Shim was 1.45mm so i either take 1.50mm or 1.55mm or leave it like it is.The manual says 0.004" max.Bone says 0.005"
Why is it better to have a little more clearance for example 0.005" instead of the oem recomended 0- 0.004" ?
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Old 05-10-2015, 07:49 PM   #2 (permalink)
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diff is fine, I prefer .004-.008, most MF installs have been at .003-.006" range keeping stock shim.

I never trusted mainshaft shimming per what you did. Either get the right tool like Aquafina has or measure the case gap with complete MS assembly installed including both washers. I aim for .008-.010" gap.

I keep .003, .004, .005, and .006" feeler gauges on the bench, double them for checking case gap.
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Old 05-11-2015, 03:06 AM   #3 (permalink)
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Ok great ,thanks Bone!Any reasons why you prefer a bigger Diff clearance then oem ?
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Old 05-11-2015, 10:28 AM   #4 (permalink)
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I went with a .004 shim clearance with my Quaife LSD. Never had any issues.
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Old 05-11-2015, 12:28 PM   #5 (permalink)
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Quote:
Originally Posted by hondanickx View Post
Ok great ,thanks Bone!Any reasons why you prefer a bigger Diff clearance then oem ?
Different goals for the assembly.

One gets hotter than the other.
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Old 05-11-2015, 11:32 PM   #6 (permalink)
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Different goals for the assembly.

One gets hotter than the other.

Ok i got it!I'm leaving the clearance as is then.
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Old 05-13-2015, 08:28 AM   #7 (permalink)
 
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Check the MS clearance with the OEM tools.
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Old 05-26-2015, 12:36 PM   #8 (permalink)
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I assembled the mainshaft and secundary shaft today ,and installed them into the case.I was wondering if this kind of miss alignment of the gears is normal?
I know there's is a slight miss alignment because of the springed shim on the mainshaft ,but my 2nd and 3rth gear look to be off more.

I'm using a S40 oem 4.4 FD , CRX ZC 3rd and 4th ,Gear-X 3.083 first into a
s20 case.The rest of the gears are Oem d16Z6 gears (EDM).New bearings and synchro's everywhere.








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Old 05-26-2015, 10:27 PM   #9 (permalink)
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When the snap ring snaps in the case the countershaft will be a couple of millimeter higher Nick. By the way, the teeth of the 3rd gear to synchonize look horrible.
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Old 05-26-2015, 10:47 PM   #10 (permalink)
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Quote:
Originally Posted by Kevinio View Post
When the snap ring snaps in the case the countershaft will be a couple of millimeter higher Nick. By the way, the teeth of the 3rd gear to synchonize look horrible.

I know 3rd gear has some synchro teeth with a lot of wear on them ,but the overal condition is ok.(Not great)Finding a better one with these old transmissions out of beaten up crx's isn't easy.
4th Gear is brand new Rover part btw
4th and 5th look to be off a few mm but my 3rd and 2nd gear looks like its off 3-4mm.

Last edited by hondanickx; 05-26-2015 at 10:51 PM.
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Old 05-26-2015, 11:19 PM   #11 (permalink)
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Quote:
Originally Posted by hondanickx View Post
I assembled the mainshaft and secundary shaft today ,and installed them into the case.I was wondering if this kind of miss alignment of the gears is normal?
I know there's is a slight miss alignment because of the springed shim on the mainshaft ,but my 2nd and 3rth gear look to be off more.


I had a similar issue... took out the shafts and tapped the ISB in the rest of the way. I documented it below in my trans thread;post#70.
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Last edited by colelmt; 05-26-2015 at 11:30 PM.
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Old 05-27-2015, 09:30 AM   #12 (permalink)
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I'll give it a try ,just going to close the case and see if it shifts .
Thanks
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