1-S73
MX5100, WSM
ENGINE
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 ones.
Oversize : 0.25 mm (0.0098 in.)
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
W1034448
(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. Measure the clearance between the outer rotor and the pump
body with a feeler gauge.
3. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
W1035296
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.
3. Remove the cover carefully, and measure the width of the press
gauge with a sheet of gauge.
4. If the clearance exceeds the factory specifications, replace oil
pump rotor assembly.
W1035444
Oversize cylinder I.D.
Factory spec.
87.250 to 87.272 mm
3.4351 to 3.4359 in.
Allowable limit
87.420 mm
3.4417 in.
Finishing
Hone to 2.2 to 3.0 μmRz
(0.000087 to 0.000118 in.Rz)
∇∇∇.
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. (Oversize)
Clearance between
inner rotor and outer
rotor
Factory spec.
0.030 to 0.14 mm
0.0012 to 0.0055 in.
Allowable limit
0.2 mm
0.008 in.
Clearance between
outer rotor and pump
body
Factory spec.
0.11 to 0.19 mm
0.0044 to 0.0074 in.
Allowable limit
0.25 mm
0.0098 in.
Clearance between
inner rotor and cover
Factory spec.
0.105 to 0.150 mm
0.00414 to 0.00590 in.
Allowable limit
0.20 mm
0.008 in.
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