Synchro Ring and Gear Inspection

Inspection





1. Inspect the inside of the synchro ring (A) for wear.





2. Inspect the synchro ring teeth (B) for wear (rounded off).





3. Inspect the synchro sleeve teeth (C) and matching teeth on the gear for wear (rounded off).





4. Inspect the gear hub thrust surface (D) for wear.
5. Inspect the cone surface (E) for wear and roughness.
6. Inspect the teeth on all gears (F) for uneven wear, scoring, galling, and cracks.
7. Coat the cone surface of the gear (E) with oil, and place the Synchro ring on it. Rotate the Synchro ring, making sure that it does not slip.





8. Measure the clearance between the Synchro ring (A) and gear (B) all the way around. Hold the Synchro ring against the gear evenly while measuring the clearance. If the clearance is less than the service limit, replace the Synchro ring and Synchro cone.
Synchro Ring-to-Gear Clearance
Standard: 0.85 - 1.10 mm (0.033 - 0.043 inch)
Service Limit: 0.4 mm (0.016 inch)
Double Cone Synchro-to-Gear Clearance Standard:
(1): Outer Synchro Ring (A) to Synchro Cone (C) 0.5 - 1.0 mm (0.02 - 0.04 inch)
(2): Synchro Cone (C) to Gear (B) 0.5 - 1.0 mm (0.02 - 0.04 inch)
(3) outer Synchro Ring (A) to Gear (B) 0.95 - 1.68 mm (0.037 - 0.066 inch)
Service Limit:
(1): 0.3 mm (0.01 inch)
(2): 0.3 mm (0.01 inch)
(3): 0.6 mm (0.02 inch)