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Inspection and Repair
Cylinder Liners
Inside diameter
Measure the inside diameter of each liner in two di-
rections, parallel and transverse to the piston pin, at
three positions, top (weared position), middle and
low. If measurements exceed the service limit, re-
place the liner.
Cylinder liner side diameter, mm [in.]
Normal value ............. Ø170 [Ø6.69]
Assembly standard ... 170.000–170.040 [6.69290–6.69447]
Service limit .............. 170.500 [6.71259]
Measuring cylinder liner protrusion
Measure the protrusion of each liner at its flange with
a dial gauge.
NOTE! The method of measuring the protrusion of an
used liner differs from that of newly installed one.
Cylinder liner protrusion at flange (A), mm [in]
Assembly standard ... 0.11–0.20 [0.0043–0.0079]
IMPORTANT! If the protrusion is less than the
assembly standard, the gasket will fail to seal
the bore resulting in gas leakage.
When cylinder head has just been removed
1. Clean the gasketed surface of the crankcase and
the top of the liners.
2. Secure the top of the liner uniformly at four plac-
es with the Liner pusher and the Bolts.
NOTE! Use the Head bolt spacers when tightening
the Line pushers using head bolts.
3. Set up the dial gauge at the top face of the crank-
case, then set the gauge pointer to zero (0).
4. Measure the protrusion at four places at the
flange of the liner. Take the average of the four
measurements.
5. If the average is less than the assembly stan-
dard, insert a shim under the collar of the cylinder
liner.
Group 21 Engine Body
95
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