Section 04 ENGINE
Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-6
ENGINE DIMENSION MEASUREMENT
This section covers all engine types.
CYLINDER HEAD WARPAGE
CYLINDER TAPER
Compare cylinder diameter 16 mm (5/8 in) from
top of cylinder to just below its intake port area.
On rotary valve engines, measure just below aux-
iliary transfer port, facing exhaust port. If the dif-
ference exceeds the specified dimension the
cylinder should be rebored and honed or should
be replaced.
NOTE:
Be sure to restore the chamfer around all
cylinder sleeve port openings.
1. Below the intake port
A. 16 mm (5/8 in) from top
CYLINDER OUT OF ROUND
Measuring 16 mm (5/8 in) from top of cylinder
with a cylinder gauge, check if the cylinder out of
round is more than the specified dimension. If
larger, cylinder should be rebored and honed or
should be replaced.
NOTE:
Be sure to restore the chamfer around all
cylinder sleeve port openings.
1. Piston pin position
2. Measures to be compared
A. 16 mm (5/8 in)
COMBUSTION CHAMBER
VOLUME MEASUREMENT
The combustion chamber volume is the region in
the cylinder head above the piston at Top Dead
Center. It is measured with the cylinder head in-
stalled on the engine.
1. Combustion chamber
ENGINE TYPE MAXIMUM
All 0.05 mm (.002 in)
ENGINE TYPE MAXIMUM
All 0.08 mm (.003 in)
ENGINE TYPE MAXIMUM
All 0.05 mm (.002 in)
A01C53A
1
A
A01C54A
2
1
A
F01D5VA
1
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