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Old 01-21-2006, 09:50 PM
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Adjustable Pivot Ball

I have a 427 and M21 with a new steel sfi flywheel, 8-spring disk, diaphragm pressure plate, & short throw-out bearing (all Ram stuff). I also purchased an adjustable pivot ball to make up for any differences from stock thicknesses. I'm using the stock bellhousing and fork. The engine/tranny is out of the car. My problem is I don't know how to set the initial pivot ball length adjustment. Is it just adjusted for a flush fit to the center of the diaphragm? Does the tranny need to be in to center the TOB, and how can you tell when it's all aligned properly? Thanks!

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Old 01-22-2006, 12:12 AM
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Adjustment

Sixty9Vette,
If you didn't get instructions with the pivot ball, read below.

If you had all the old stuff you took out, and you didn't change the adjustment ROD from the old stuff, you could compare assembled heights. Tighten the old clutch set-up to old flywheel, set the throw-out bearing on pressure plate fingers and compare the height to the new stuff. We're not talking thousandths here, you could use a brazing rod or welding electrode and mark the height on the rod with a marker.

The whole idea here is to have the right free play and still have rod adjustment to compensate for wear.

While you're putting in all this nice stuff, take the time to check dowel pin alignment of your bellhousing. With just the bell installed, put an magnetic indicator on your crank flange and indicate the bellhousing hole. 0-.005 runout is the target. Lakewood or Moroso make the offset dowels to correct any crankshaft to transmission mis-alignment.

Any mis-alignment will put excessive load on #5 main bearing, input shaft and input shaft bearing, not to mention you could have an oil leak from your rear main seal.

When I get back from China, I'll post some pictures of my Vettes and engines. Good luck with that 69, they're a little snug when installing a Lakewood bell & 427, but you can get the top bell bolts with an angled offset 9/16 box wrench.

y112
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Old 01-22-2006, 09:25 PM
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Thanks for the info! I did have the old stuff laying around, so put it together and made the measurements. Both TOB's are the same height, but the old setup, from crank flange to tips of fingers is 9/32" taller than the Ram setup. I adjusted the pivot ball 5/16 taller than the old ball and installed the tranny. It all looks ok, but I still don't get how you can be dead on square to the fingers without being able to measure anything when the tranny is in. Perhaps we're not talking brain surgery here...
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