ENGINE
M6040, M7040, WSM
1-S79
Correcting Cylinder (Oversize)
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
2. Replace the piston and piston rings with oversize 0.5 mm
(0.0197 in.) ones.
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
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(6) Oil Pump
Rotor Lobe Clearance
1. Measure the clearance between lobes of the inner rotor and the
outer rotor with a feeler gauge.
2. If the clearance exceeds the allowable limit, replace the oil
pump rotor assembly.
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Clearance between Outer Rotor and Pump Body
1. Measure the clearance between the outer rotor and the pump
body with a feeler gauge.
2. If the clearance exceeds the allowable limit, replace the oil
pump rotor assembly.
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Clearance between Rotor and Cover
1. Put a strip of plastigage onto the rotor face with grease.
2. Install the cover and tighten the screws with the specified
torque.
3. Remove the cover carefully, and measure the amount of the
flattening with the scale and get the clearance.
4. If the clearance exceeds the allowable limit, replace oil pump
rotor assembly and the cover.
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Cylinder I.D. (2) Factory specification
94.500 to 94.522 mm
3.7205 to 3.7213 in.
Maximum wear Allowable limit
94.65 mm
3.7264 in.
Finishing
Hone to 2.2 to 3.0 µm Rz
(0.000087 to 0.00012 in. Rz)
(1) Cylinder I.D. (Before Correction) (2) Oversize Cylinder I.D.
Clearance between inner
rotor and outer rotor
Factory specification
0.03 to 0.09 mm
0.002 to 0.003 in.
Allowable limit
0.3 mm
0.012 in.
Clearance between outer
rotor and pump body
Factory specification
0.100 to 0.184 mm
0.00394 to 0.00724 in.
Allowable limit
0.30 mm
0.012 in.
Clearance between rotor
and cover
Factory specification
0.025 to 0.075 mm
0.00099 to 0.0029 in.
Allowable limit
0.225 mm
0.00886 in.
Tightening torque Oil pump cover screw
7.9 to 9.3 N·m
0.80 to 0.95 kgf·m
5.8 to 6.8 lbf·ft
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