Section 05
ENGINE (4-TEC)
Subsection 09
(ENGINE BLOCK)
SMR2002_073_05_09A.FM
05-09-19
Piston
Inspect piston for scoring, cracking or other dam-
ages. Replace piston and piston rings if necessary.
Using a micrometer, measure piston at 18 mm
(.709 in) perpendicularly (90°) to piston pin axis.
1. Measuring perpendicularly (90°) to piston pin axis
A. 18 mm (.709 in)
The measured dimension should be as described
in the subsequent table. If not, replace piston.
Piston/Cylinder Clearance
Adjust and lock a micrometer to the piston dimen-
sion.
1. Micrometer set to the piston dimension
With the micrometer set to the dimension, adjust
a cylinder bore gauge to the micrometer dimen-
sion 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 62 mm (2.44 in) above
cylinder base, measuring perpendicularly (90°) to
piston pin axis.
Read the measurement on the cylinder bore gauge.
The result is the exact piston/cylinder wall clear-
ance.
NOTE:
Make sure used piston is not worn. See PIS-
TON MEASUREMENT above.
PISTON MEASUREMENT
mm (in)
NEW NOMINAL
99.951 to 99.969 mm
(3.935 to 3.936 in)
SERVICE LIMIT
99.80 mm (3.929 in)
1
R610motr136A
A
F00B08A
1
PISTON/CYLINDER CLEARANCE mm (in)
NEW NOMINAL
0.0 24 to 0.056 mm
(.0009 to .0022 in)
SERVICE LIMIT
0.090 mm (.004 in)
F00B09A
1
2
F00B0AA
1
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Summary of Contents for GTX 4-TEC 5573 2002
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