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Hello.

GM manual quiet on this item. My 85 305 crankshaft pulley needs to be replaced. There is one center bolt and 3 smaller bolts around the center's perimeter. The center bolt is a Grade 8 marked 'TR'; the 3 smaller bolts are Grade 5 wth no other markings.

It appears these bolts mount the pulley directly to the torsional damper. Torque per manual says 60 ft-lbs.

Does the TR stand for 'threads reversed'?? Is that center bolt on the pulley actually a reverse bolt??

Thanks for any help!!

Taj
 

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Not sure maybe the "TR" means tighten right! he he he. Anyway, the bolt is right hand thread.
 

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No you use that when setting the timing on a new cam and have to turn the direction of the engine rotation. So no it is not counter turned/reverse thread.

There is a puller to remove the damper. the three bolts hold the pully secure to the damper and the center holds the damper in place.

I think it means treated but I am only guessing now.
 
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