A thread chase is essentially a non-cutting tap. It's used to reshape and space threads. If you don't have a chaser or can't find one you may use a tap, just be very careful getting it started as it will cut new threads and mangle the existing ones if you don't get it in straight. (NEVER use either with a drill! Hand power only!) Lubricate it well and remove it and clean it about every 1/4" to prevent shavings and dirt from chewing up the threads. Then when you're ready to install lube the hell out of the bolts with the included moly grease and torque in steady, even passes.
I'm just going to cut and paste what I've posted before:
Quote:
Originally Posted by cre
75 ft lbs with moly and the threads MUST be chased. Torque in multiple passes 3 - 5 and if you encounter striction back off an eighth up to a quarter turn and resume. Each pass should go smoothly, if it stutters or jumps (striction or static friction) then it's not lubed well enough, it's binding on the threads or you're moving too slowly... It will usually result in false torque readings.
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Retorque after a few hundred miles:
http://www.toyota-supra.info/forums/77288-post10.html