ENGINE
M6060, M7060, WSM
1-S76
(5) Cylinder
Cylinder Wear
1. Measure the I.D. of the cylinder at the 6 positions (see figure)
with a cylinder gauge and find the maximum and minimum inner
diameters.
2. Find the difference between the maximum and the minimum
inner diameters.
3. If the maximum I.D. or the difference is more than the allowable
limit, bore and hone it to the oversize dimension. (Refer to
"Cylinder Correction (Oversize)".)
4. Examine the cylinder wall for scratches. If you find deep
scratches, bore the cylinder. (Refer to "Cylinder Correction
(Oversize)".)
9Y1210828ENS0119US0
Cylinder Correction (Oversize)
1. If the cylinder wear is more than the allowable limit, bore and
hone it to the specified dimension.
2. Replace the piston and piston rings with oversize ones (0.5 mm,
0.02 in.).
• If the maximum I.D. or the difference for the oversize
cylinder is more than the allowable limit, replace the
cylinder block with a new one.
9Y1210828ENS0120US0
(6) Oil Pump
Clearance between Inner Rotor and Outer Rotor
1. Measure the clearance between the lobes of the inner rotor and
the outer rotor with a feeler gauge.
2. If the clearance more than the allowable limit, replace the oil
pump rotor assembly.
9Y1210828ENS0121US0
Cylinder Bore I.D.
Factory specification
94.000 to 94.022 mm
3.7008 to 3.7016 in.
Allowable limit
94.15 mm
3.707 in.
(A) Top
(B) Middle
(C) Bottom (Skirt)
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
Oversize cylinder I.D. Factory specification
94.500 to 94.522 mm
3.7205 to 3.7213 in.
Maximum wear Allowable limit
94.65 mm
3.726 in.
Finishing Hone to 2.2 to 3.0 μmRz (0.000087 to 0.00011 in.Rz)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. (Oversize)
Clearance between inner
rotor and outer rotor
Factory specification
0.030 to 0.090 mm
0.0012 to 0.0035 in.
Allowable limit
0.30 mm
0.012 in.
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