ENGINE TOP END
3-5-24
Combustion Area
NOTE
The valves can be re-faced or end ground, if necessary.
They must be replaced if extensively worn, burnt, bent
or damaged.
◆
Measure diameter of valve stem with a micrometer
in three places, then rotate 90° and measure
again (take six measurements total). Compare to
specifi cations.
Valve Stem Diameter:
Standard Service Limit
Exhaust:
5.455 ~ 5.470 mm
(0.2147" ~ 0.2153")
————
Inlet:
5.475 ~ 5.490 mm
(0.2155" ~ 0.2161")
————
◆
Measure diameter of valve stem with a micrometer
in three places, then rotate 90° and measure
again (take six measurements total). Compare to
specifi cations.
Valve Guide I.D.:
5.500 - 5.515 mm(0.2165" ~ 0.2171")
◆
Be sure to measure each guide and valve
combination individually.
NOTE
The valve guides cannot be replaced.
Combustion Chamber Cleaning
Combustion Chamber Cleaning
!
WARNING
Wear eye protection during combustion chamber cleaning.
◆
Clean all accumulated carbon deposits from
combustion chambers and valve seat area.
NOTE
Carbon Clean Fuel Treatment can be used to help
remove carbon deposits.
CAUTION
Do not use a metal scraper, a coarse wire brush or
abrasive cleaners to clean the cylinder head. Damage
may result.
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