Section 04 ENGINE
Subsection 05 (COMPRESSION TEST AND ENGINE DIMENSION MEASUREMENT)
04-05-2 MMR2000_120_04_05A.FM
ENGINE DIMENSION MEASUREMENT
VALVE SPRING FREE LENGTH
Measure valve springs free length with a caliper,
as shown in the next photo.
NOTE: When measuring free length, ensure not
to apply pressure onto spring.
VALVE SPRING FREE LENGTH
If the springs are shorter than service limit value,
replace with new one.
VALVE SEAT WIDTH
Measure valve seat width using a caliper, as
shown in the next photo.
VALVE SEAT WIDTH
If valve seat width is under the standard or over
the service limit value, replace cylinder head with
new one.
VALVE STEM (outside diameter)
Measure valve stem with a micrometer, as shown
in the next photo.
TYPICAL
Inspect valve surface, check for abnormal stem
wear and bending. If so, replace valve with new
one.
VALVE GUIDE (inside diameter)
Clean valve guides to remove carbon deposits be-
fore measuring.
Measure valve guide inside diameter using a small
hole telescoping gauge and a micrometer.
Replace cylinder head if valve guides are over ser-
vice limit value.
STANDARD SERVICE LIMIT
30.5 mm (1.20 in) 29.5 mm (1.16 in)
STANDARD SERVICE LIMIT
0.8 mm (0.03 in) 2.0 mm (0.08 in)
A31C1LA
A31C1MA
STANDARD SERVICE LIMIT
INTAKE
5.48 mm
(0.216 in)
5.318 mm
(0.2094 in)
EXHAUST
5.44 mm
(0.214 in)
5.275 mm
(0.2077 in)
STANDARD SERVICE LIMIT
5.50 mm (0.217 in) 5.572 mm (0.2194 in)
A31C1NA
To Next Page
Loading...
Need help?
General
