Cub Cadet 8454 Service Manual page 72

CHAPTER 2 8454
(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
Free length Factory
spec.
Allowable
limit
(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 Allowable
square ness limit
(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 Factory
spec.
Allowable
limit
Rocker arm Factory
shaft O.D. spec.
Rocker
Factory
arm I.D.
spec.
2-50
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
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.
1.0 mm
0.039 in.
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.
569W290A
569W291A
569W292A
D569-W02 May-2003