Synchro Ring, Gear
Inspection
1. Inspect the synchro ring and gear.
A : Inspect the inside of the synchro ring for wear.
B : Inspect the synchro sleeve teeth and matching
teeth on the synchro ring for wear (rounded
off).
C : Inspect the synchro sleeve teeth and matching
teeth on the gear for wear (rounded off).
D : Inspect the gear hub thrust surface for wear.
E: Inspect the cone surface for wear and
roughness.
F: Inspect the teeth on all gears for uneven wear,
scoring, galling, and cracks.
2. Coat the cone surface of the gear with oil, and place
the synchro ring on the matching gear. Rotate the
synchro ring, making sure that it does not slip.
Measure the clearance between the synchro ring
and gear all the way around.
NOTE: Hold the synchro ring against the gear
evenly while measuring the clearance.
Synchro Ring-to-Gear Clearance
Standard: 0.85—1.1 mm
(0.033-0.043 in)
Service Limit: 0.4 mm (0.016 in)
Double Cone Synchro-to-Gear Clearance
Standard:
(Outer Synchro Ring to Synchro Cone)
0.5-1.0 mm (0.020-0.039 in)
(Synchro Cone to Gear)
0.5-1.0 mm (0.020-0.039 in)
(Outer Synchro Ring to Gear)
0.95-1.68 mm (0.037-0.066 in)
Service Limit:
0.3 mm (0.012 in)
0.3 mm (0.012 in)
0.6 mm (0.024 in)
If the clearance is less than the service limit,
replace the synchro ring and synchro cone.
SYNCHRO SPRING
SYNCHRO RING
SYNCHRO RING
GEAR
SYNCHRO CONE
INNER
SYNCHRO
RING
OUTER SYNCHRO RING
GEAR
Inspection
1. Inspect the synchro ring and gear.
A : Inspect the inside of the synchro ring for wear.
B : Inspect the synchro sleeve teeth and matching
teeth on the synchro ring for wear (rounded
off).
C : Inspect the synchro sleeve teeth and matching
teeth on the gear for wear (rounded off).
D : Inspect the gear hub thrust surface for wear.
E: Inspect the cone surface for wear and
roughness.
F: Inspect the teeth on all gears for uneven wear,
scoring, galling, and cracks.
2. Coat the cone surface of the gear with oil, and place
the synchro ring on the matching gear. Rotate the
synchro ring, making sure that it does not slip.
Measure the clearance between the synchro ring
and gear all the way around.
NOTE: Hold the synchro ring against the gear
evenly while measuring the clearance.
Synchro Ring-to-Gear Clearance
Standard: 0.85—1.1 mm
(0.033-0.043 in)
Service Limit: 0.4 mm (0.016 in)
Double Cone Synchro-to-Gear Clearance
Standard:
(Outer Synchro Ring to Synchro Cone)
0.5-1.0 mm (0.020-0.039 in)
(Synchro Cone to Gear)
0.5-1.0 mm (0.020-0.039 in)
(Outer Synchro Ring to Gear)
0.95-1.68 mm (0.037-0.066 in)
Service Limit:
0.3 mm (0.012 in)
0.3 mm (0.012 in)
0.6 mm (0.024 in)
If the clearance is less than the service limit,
replace the synchro ring and synchro cone.
SYNCHRO SPRING
SYNCHRO RING
SYNCHRO RING
GEAR
SYNCHRO CONE
INNER
SYNCHRO
RING
OUTER SYNCHRO RING
GEAR