Synchronizers Cleaning and Inspection
WARNING: This page is about a different variant/trim than selected.
- Clean all the synchronizer parts in a suitable cleaning solvent and air dry all the parts.
- Inspect the 1st/2nd gear, 3rd/4th gear, and 5th gear synchronizer hubs for a force fit on the main shaft.
- Replace synchronizer hubs that do not require a force fit.
- Inspect the synchronizer hubs for wear on the external splines. A stepped effect on the teeth, due to wear, may cause shift concerns.
- Replace a worn hub.
- Correct the cause, such as, but not limited to the following conditions:
- Engine related vibrations
- Driving at a low speed in a high gear
- Defective vibration damper or crankshaft
- Inspect the synchronizer sleeve teeth (1) for the following conditions, which may cause shift concerns:
- Grated teeth
- Chipped off teeth
- Blunted teeth
- Inspect the synchronizer sleeve detent stops (2) for wear or for being chipped off.
- Replace the synchronizer assembly if the teeth or stops show the above conditions.
- Inspect the synchronizer blocker rings for worn away grooves (1).
- Replace the blocker ring assembly if the blocker ring grooves are worn.
- Inspect the synchronizer blocker rings for worn shift teeth.
- Inspect the internal ring for being warped or damaged.
- Inspect the outer ring for worn grooves.
- Replace the synchronizer assembly for any of the above conditions.
- Install the synchronizer blocking rings to the correct speed gear.
- Inspect the braking effect of the blocking ring. Turn the blocking ring in one direction while pushing to the gear cone. Ensure the ring locks.
- If the ring does not lock, replace the synchronizer assembly.
- Inspect the pressure pieces (1) for wear or damage.
- Replace the worn pressure pieces.
NOTE:
When servicing the synchronizers, retain them in the order that they are removed. Mark the parts to ensure the correct position for inspection and assembly.