Section 03 ENGINE
Sub-Section 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
03-04-6
ENGINE DIMENSION MEASUREMENT
This section covers all engine types.
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)
CYLINDER/PISTON CLEARANCE
Measurement (used parts)
Check cylinder taper and out-of-round as described
above before proceeding with piston/cylinder clear-
ance.
To accurately determine piston to cylinder clear-
ance, the piston should be measured under the
axis hole and 90° to piston pin axis. Find the big-
gest diameter.
The cylinder should be measured 16 mm (5/8 in)
below its top edge. Find the smallest diameter.
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
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