Posted by chriscase on Tuesday, September 25, 2007 at 18:27:42 :
In Reply to: component rebuilding posted by Joel Wilkins on Tuesday, September 25, 2007 at 11:29:16 :
The "synchroniser" is the big steel part that the shift fork hooks into. It should slide freely, but not wobble. If you can wobble it, it's toast. Usual cause is bent forks, from trying to force it into a gear.
The "synchro rings" or "blocker rings" are the bronze parts. They have a conical inside diameter that mates with a cone on the gears. The two cones cause friction, that then makes the components "synchronize" their speed. Until the speeds match, the bronze ring blocks the synchronizer from engaging with the gear. To inspect for wear, slip the ring over it's gear, and check for clearance between the ring and the gear engagement teeth- those little teeth that match up with the teeth on the outer edge of the ring. Usual minimum is about .060". Most trannys need a couple blocker rings, and all new bearings and seals. Gears and shafts per inspection and test drive before tear down.
I've kept a bucket of blocker rings around. Scrap bronze, plus a supply to mix and match for repair jobs.