Section 04 ENGINE
Subsection 05 (COMPRESSION TEST AND ENGINE DIMENSION MEASUREMENT)
04-05-4 MMR2000_120_04_05A.FM
TYPICAL
1. Measuring perpendicularly (90º) to piston pin axis
A. 10 mm (25/64 in)
The measured dimension should be as described
in the previous table. If not, install a new piston.
CYLINDER/PISTON CLEARANCE
Used and New Pistons
NOTE: Make sure used piston is not worn. See
USED PISTON MEASUREMENT above.
Adjust and lock a micrometer to the piston dimen-
sion.
1. Micrometer set to the piston dimension
With the micrometer set to the piston dimension,
adjust a cylinder bore gauge to the micrometer di-
mension and set the indicator to 0 (zero).
1. Use the micrometer to set the cylinder bore gauge
2. Dial bore gauge
TYPICAL
1. Indicator set to 0 (zero)
Position the dial bore gauge at 16 mm (5/8 in) be-
low cylinder top edge, measuring perpendicularly
(90°) to piston pin axis. See CYLINDER INSIDE DI-
AMETER above.
Read the measurement on the cylinder bore
gauge. The result is the exact piston/cylinder wall
clearance. If clearance exceeds specified toler-
ance, replace cylinder or rebore. See previous ta-
ble.
NOTE: Make sure the cylinder bore gauge indica-
tor is set exactly at the same position as with the
micrometer, otherwise the reading will be false.
STANDARD SERVICE LIMIT
0.015 - 0.050 mm
(0.0006 - 0.0020 in)
0.12 mm
(0.005 in)
F01D0NA
1
A
F00B08A
1
F00B09A
1
2
F00B0AA
1
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