Toro 159cc, Руководство по обслуживанию

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Valve Stem Inspection
Inspect each valve for face irregularities, bending
or abnormal wear.
Valve Stem Diameter Specification
Standard Service Limit
Intake
0.2157” (5.48 mm) 0.2093” (5.318 mm)
Exhaust
0.2141” (5.44 mm) 0.0047” (0.12 mm)
NOTE: If this measurement is out of specification, complete engine replacement is required.
The only internal parts available for this engine are gaskets and seals.
Valve Guide Inspection
Ream the exhaust valve guide to remove any carbon deposits before
measuring.
Valve Guide ID Specification:
Standard Service limit
0.2165” (5.50 mm) 0.2193” (5.572 mm)
NOTE: If this measurement is out of specification, complete engine replacement is required.
The only internal parts available for this engine are gaskets and seals.
Valve Stem to Guide Clearance
Subtract each valve stem OD from the corresponding guide ID to
obtain the guide-to-stem clearance.
Standard Service limit
Intake
.00039” - 0.0013”
(0.01-0.034 mm)
.00393”
(0.10 mm)
Exhaust 0.0019 -
0.0027”
(0.05-0.070 mm)
0.0047”
(0.12 mm)
NOTE: If this measurement is out of specification, complete engine replacement is required.
The only internal parts available for this engine are gaskets and seals.
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