[6pack] Gunst Bearing Experiences?

[Sally or Dick Taylor]

Tom---The idea behind the preload is to make certain that the Gunst bearing never stops spinning with a running clutch. A stretch of 15mm connected to the top hole in the arm should be enough to do the trick. As the clutch disc lining wears, the spring is stretched further, increasing the preload, slight as this may be.  If you want to make a simple setup here, rig up something to see how much tension is necessary to spin the bearing. You can use a drill press and a bathroom scale. Compare the poundage necessary to stretch the given spring 15mm. Find a compression spring that when compressed 15mm, equals the same poundage.

Consider that when the clutch is disengaged it takes about 250 to 300 lb to do so. (Many, many times the preload).  I don't think you can hurt this bearing when using the spring provided, even with a 30mm stretch of the spring, in the bottom hole. Still, I'd go with the original instructions. I know it works!

Dick


-----Original Message-----
From: Tomislav Marincic
Sent: Saturday, April 4, 2009 12:58 PM
To: 6pack
Subject: [6pack] Gunst Bearing Experiences?

Hello,

I'm installing the external spring for the Gunst throw-out bearing in my TR6, and I'm a little concerned about the amount of tension specified in the most recent instructions.

The original German instructions, available at the Buckeye Triumphs web site, specify stretching the spring 15mm to supply pretension. My written instructions from TRF called for 25mm, but I talked with Dave Swauger yesterday about a related issue, and he told me TRF now recommends 30mm, and using the bottom lever arm hole instead of the top, as originally specified.

I'm worried about frying my thrust bearings in short order with that much preload. 30mm of stretch produces a lot of preload, and using the bottom lever hole increases the effect at the TOB further. Is it really necessary?

Has anyone out there got some first-hand experience at a lower preload level? Was the TOB chirping or causing other problems?

TIA, Tom
CC55483L



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