How to measure LSD stack clearance - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 5 (permalink) Old 05-01-2019, 02:24 AM Thread Starter
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How to measure LSD stack clearance

Hi,

I need to check the clearance in the limited slip stack of my GTV race car. I've read many posts on this, but it is not obvious to me where you actually make the clearance measurement.

Can someone tell me?

Thanks,

bob brady
Delaware Valley Alfa Romeo Owners' Club

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Unionville, PA
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post #2 of 5 (permalink) Old 05-01-2019, 04:00 AM
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@bobbrady Hi Bob, It's been years since I did this on my 74. I seem to remember shimming it until it had a certain pre-load that I checked with an old style torque wrench and a special tool that I made. Also, does anyone here know if the rear diff (115 series LSD) SPIDER GEARS are the same as the SPIDER GEARS in alfetta transaxles? I have a new, in the box, 115 series LSD that was never used, but is missing one of the SPIDER GEARS. Weird, I know. I also have access to some junk 116 transaxles. Bob, see you at the Cortile in July?
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post #3 of 5 (permalink) Old 05-01-2019, 07:56 AM
Richard Jemison
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LSD

You DEFINITELY do NOT pre-load.

All internals should be cleaned of lubricants, and be dry.( that alter clearance measurements) when assembled including the cover you can lift the internals to feel clearance and measure it. If its a 2 disk street application you want .008 to .010" play dry. IOf it`s a 4 disk race unit you want at least .012-.014. This allows the ramps to work as designed.

If you pre-load you won`t get the lockup and the forced wear and heat will ruin the clutch disk.

Richard Jemison
RJR Racing

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post #4 of 5 (permalink) Old 05-01-2019, 08:15 AM
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@Alfar7, perhaps preload is the wrong term. Testing for the force required to turn the LSD with a beam style torque wrench is what I am trying to describe. The procedure described in the Kartalamakis High Performance Manual is what I followed.

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post #5 of 5 (permalink) Old 05-01-2019, 04:35 PM Thread Starter
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Thanks, all.

Not to be dense, but it's still not obvious to me where to insert a feeler gauge. But, I suppose one way would be to add a known shim, then measure the clearance between the carrier flange and the LSD flange, then subtract for the known thickness of the shim?

And Andy, yes, I plan to be in Pittsburgh. Going to drive the GTV in Shenley as long as they accept my registration. Hope to see you there. BTW, there was a lovely GTV-6 at VIR in Marlborough livery - very pretty!

Thanks, bob

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