Cub Cadet 7360SS, Руководство по обслуживанию

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79
4-5. INSPECTION
(1) CYLINDER HEAD AND VALVE
MECHANISM
1.cylinder head
Using a heavy accurate straight edge and a
feeler gauge, check the bottom face for
warpage in three positions lengthwise, two
crosswise and two widthwise as shown in the
illustration. If warpage exceeds the limit,
reface the bottom face with a surface grinder.
Unit:mm(in.)
Item Standard Limit
Warpage of 0.05(0.0020) 0.10
cylinder head maximum (0.0039)
bottom face
2.Rocker arms and rocker shaft
Measure the bore in the rocker arm for the
rocker shaft and the diameter of the rocker
shaft to find the clearance between the arm
and shaft. If the clearance has reached the
limit, replace the rocker arm. If it exceeds the
limit, replace both arm and shaft.
Unit:mm(in.)
Item Nominal Standard Limit
size
Bore in rocker 0.744 0.74449 to 0.74527
arm for shaft (18.9) (18.910 to 18.930)
Diameter of 0.744 0.74331 to 0.74401
shaft for arm (18.9) (18.880 to 18.898)
Clearance between 0.00047 to 0.00197 0.00787
rocker arm and shaft (0.012 to 0.050) (0.200)
3.Valve springs
Check the squareness and free length. If the
squareness and /or free length exceeds the
limit, replace the spring.
Item Standard Limit
Free length 47(1.85) 46(1.81)
Squareness 1.5 maximum
Length under 13.9 0.7
test force: (30.6 1.5)
39.1(1.54) [136 7]
Length under 29 2 -15%
test force: (64 4.4)
30.5(1.20) [284 20]
T
est
force
,kgf(lbf)[N]