ENGINE
2-51
D569-W02 May-2003
569W295A
569W294A
569W293A
b. Timing Gears and Camshafts
(A) Timing gear backlash
1. Set a dial indicator (lever type) with its tip on the
gear tooth.
2. Move the gear to measure the backlash, holding its
mating gear.
3. If the backlash exceeds the allowable limit, check
the oil clearance of the shafts and the gear.
4. If the oil clearance is proper, replace the gear.
Clearance
Factory
spec.
Allowable
limit
0.04 ~ 0.11 mm
0.0016 ~ 0.0043 in.
0.15 mm
0.0059 in.
(B) Idle gear side clearance
1. Pull the idle gear collar 2 (1) and push the idle gear
(2) to each end.
2. Measure the clearance A between the idle gear and
the idle gear collar 2 (1) with a feeler gauge.
3. If the clearance exceeds the allowable limit, replace
the idle gear collar 1 (3).
(1) Idle Gear Collar 2 (3) Idle Gear Collar 1
(2) Idle Gear
Side
clearance
0.20 ~ 0.51 mm
0.0079 ~ 0.021 in.
0.9 mm
0.035 in.
Factory
spec.
Allowable
limit
(C) Cam gear side clearance
1. Pull the cam gear (2) with the camshaft (1) to its
end.
2. Measure the clearance A between the cam gear (2)
and the camshaft stopper (3).
3. If the clearance exceeds the allowable limit, replace
the camshaft stopper (3).
(1) Camshaft (3) Camshaft Stopper
(2) Cam Gear
Side
clearance
Factory
spec.
Allowable
limit
0.07 ~ 0.22 mm
0.0028 ~ 0.0087 in.
0.3 mm
0.0118 in.
www.mymowerparts.com
K&T Saw Shop 606-678-9623 or 606-561-4983
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