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CHAPTER 3 ENGINE
Valve Stem O.D
Measure valve stem O.D with a micrometer
Service Limit
IN: 4.975-4.990mm
EX: 4.955-4.970mm
Tool: Micrometer (0-25mm)
Valve Stem Run-out
Support valve stem with V block as illustrated on the
right. Check the run-out with a dial gauge.
Service Limit: 0.05mm
Tool: Magnetism Stand
Dial Gauge (1/100)
V block
Valve Head Radial Run-out
Measure the valve head radial run-out as illustrated
on the right.
Valve head Radial Run-out out of range: →Replace
Service Limit: 0.03mm
Tool: Dial Gauge (1/100)
Magnetic Stand
V Block
Valve Face Wear
Check each valve face for wear or damage.
Replace valve with a new one if it is found to have
abnormal wear. Measure valve head thickness T.
Valve head thickness T out of range: → Replace
Service Limit: 0.5mm
Tool: Vernier Caliper
Valve Stem End
Check valve stem end for pitting or wear. In case of
any pitting or wear, resurface the valve stem end. If
the length T is less than service limit, replace valve
with a new one.
Valve Stem End Length
Service Limit: 2.1mm
Tool: Vernier Caliper
T-Boss550 SERVICE MANUAL20.0
CHAPTER 3 ENGINE
PAGE. 3- 51
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