Cub Cadet 8454 - Manual (Page 72)

CHAPTER 2 8454
2-50 D569-W02 May-2003
11
10
9
569W291A
569W292A
569W290A
(F) Valve spring
1. Measure the free length of the spring with venire
calipers.
2. Place the spring on a spring compression tester and
compress to the specified length, and get the tension.
3. If the measurement is less than the allowable limit,
replace the valve spring.
Tension Factory
spec.
Allowable
limit
Factory
spec.
Allowable
limit
117 N/35.15 mm
12.0 kgf/35.15 mm
26.5 lbs/1.3839 in.
100 N/35.15 mm
10.2 kgf/35.15 mm
22.5 lbs/1.3839 in.
41.7 ~ 42.2 mm
1.6417 ~ 1.6614 in.
41.2 mm
1.622 in.
(G) Valve spring squareness (Tilt)
1. Place the spring on the surface plate, and a square
at its side.
2. Measure the maximum distance “A” (see figure),
rotating spring.
3. If the measurement exceeds the allowable limit re-
place.
Valve spring
square ness Allowable
limit
1.0 mm
0.039 in.
Free length
(H) Rocker arm bushing and shaft clearance
1. Measure the rocker arm I.D. with an inside micrometer.
2. Measure the rocker arm shaft O.D. with an outside
micrometer.
3. If the clearance exceeds the allowable limit, replace
the rocker arm.
4. If the clearance still exceeds the allowable limit after
replacing the rocker arm replace the rocker arm shaft.
Clearance
Rocker arm
shaft O.D.
Rocker
arm I.D.
Factory
spec.
Allowable
limit
Factory
spec.
Factory
spec.
0.020 ~ 0.070 mm
0.00079 ~ 0.00276 in.
0.15 mm
0.0059 in.
18.955 ~ 18.980 mm
0.74626 ~ 0.74724 in.
19.000 ~ 19.025 mm
0.74803 ~ 0.74902 in.