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Timing gear backlash
To measure the backlash between the gears, set up
a dial gauge so that it contacts the pitch circle of the
gear to measure. If a dial gauge is not available, mea-
sure the backlash by inserting feeler gauges between
the gear teeth. If the backlash exceeds the service
limit, replace the worn gears.
Timing gear backlash, mm [in]
Standard clearance ... 0.12–0.18 [0.0047–0.0071]
Repair limit ................ 0.30 [0.0118]
Service limit .............. 0.50 [0.0197]
Idler gears, bushings, and shafts
Measuring idler gear bushing inside diameter and
idler gear shaft diameter. If the service limit is ex-
ceeded, replace the bushing or shaft (whichever is
worn).
Idler gear bushing inside diameter, mm [in]
Nominal value ........... Ø65 [2.56]
Assembly standard ... 65.000–65.030 [2.55906–2.56024]
Service limit .............. 65 [2.56142]
Idler gear shaft diameter, mm [in]
Nominal value ........... Ø65 [2.56]
Assembly standard ... 64.951–64.970 [2.55713–2.55787]
Service limit .............. 64.900 [2.55512]
Idler gear end play
Measure the end play with feeler gauges or dial
gauge. If the idler gear end play exceeds the service
limit, replace the thrust plate.
Idler gear end play, mm [in]
Standard clearance ... 0.3–0.6 [0.0118–0.0236]
Service limit .............. 1.0 [0.0397]
Replace idler bushing
1. Use the Idler bushing puller to remove the bush-
ing.
2. Install a new bushing to the gear by pressing it
until the end face of the bushing is 1 mm [0.04
in.] (A) recessed from that of the gear boss.
3. After installing the bushing, make sure that its in-
side diameter is within the assembly standard. If
not, ream the bushing to the correct diameter (0.4
Ra).
Group 21 Engine Body
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