Name: AllOEMManuals
Address: 316 Brandywine Ave, Streetman, TX, 75859, US
Telephone: +14699867883
Price range: $$

Inspect synchronizer blocker ring fiber liner (1) for wear or damage (glazed, burned or missing).
Inspect synchronizer blocker ring teeth (2) for excessive wear.
Inspect synchronizer blocker ring lugs (3) for excessive wear.
Inspect synchronizer spring (4) for wear.

Fig 1: Inspecting Synchronizer Blocker Ring
Courtesy of GENERAL MOTORS CORP.
Inspect gear thrust surface (1) for wear or scoring.
Inspect gear cone surface (2) for wear.
Inspect clutching teeth (3) for excessive wear, chipping, or cracks.
Inspect gear teeth (4) for uneven wear scoring, galling or cracks.

Fig 2: Inspecting Gear
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: When installing new blocker rings, soak in Saturn Transaxle Fluid 15 minutes prior to installing/measuring.
Install synchronizer blocker ring to matching gear and rotate until it stops.
Measure clearance between blocker ring and gear in four places.
The minimum blocker ring to gear clearance for all synchronizers:

Blocker ring to gear clearance (minimum): 0.4 mm (0.020 in.)

Fig 3: Measuring Blocker Ring-To-Gear Clearance
Courtesy of GENERAL MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Gear Synchronizer Blocker Ring Inspection