Hummer H3. Manual — part 1508

Grated teeth

Chipped off teeth

Blunted teeth

8. Inspect the synchronizer sleeve detent stops (b) for wear or for being chipped off.

9. Replace the synchronizer assembly if the teeth or stops show the above conditions.

Fig. 162: View Of Synchronizer Blocker Rings Grooves

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Courtesy of GENERAL MOTORS CORP.

10. Inspect the synchronizer blocker rings for worn away grooves (a).

11. Replace the blocker ring assembly if the blocker ring grooves are worn.

Fig. 163: Inspecting Synchronizer Blocker Rings For Wear Or Damage
Courtesy of GENERAL MOTORS CORP.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

12. Inspect the synchronizer blocker rings for worn shift teeth.

13. Inspect the internal ring for being warped or damaged.

14. Inspect the outer ring for worn grooves.

15. Replace the synchronizer assembly for any of the above conditions.

Fig. 164: Ensuring Blocking Ring Locks
Courtesy of GENERAL MOTORS CORP.

16. Install the synchronizer blocking rings to the correct speed gear.

17. 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.

18. If the ring does not lock, replace the synchronizer assembly.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 165: Measuring Blocker Ring To Gear Clearance
Courtesy of GENERAL MOTORS CORP.

19. Except for 5th gear, measure the blocker ring to gear clearance.

1. Assemble the correct blocker ring to the correct gear.

2. Apply pressure to the blocker ring to fully seat the ring.

3. Using a feeler gage, measure between the blocker ring teeth and the teeth on the gear.

Specification:

Minimum Clearance 4th Gear: 0.8 mm (0.031 in)

Minimum Clearance 3rd Gear: 0.8 mm (0.031 in)

Minimum Clearance 2nd Gear: 0.8 mm (0.031 in)

Minimum Clearance 1st Gear: 0.8 mm (0.031 in)

20. If using a NEW blocker ring and the standard clearance can not be obtained, replace the

gear.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3