ENGINE
SM-E4B SERIES, WSM
1-S68
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.)
Marking : 025
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
9Y1210785ENS0097US0
(6) Oil Pump
Rotor Lobe Clearance
1. Measure the clearance between lobes of the inner rotor and the
outer rotor with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the
oil pump rotor assembly.
9Y1210785ENS0098US0
Clearance between Outer Rotor and Pump Body
1. Measure the clearance between the outer rotor and the pump
body with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the
oil pump rotor assembly.
9Y1210785ENS0099US0
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 amount of the
flattening with the scale and get the clearance.
4. If the clearance exceeds the factory specifications, replace oil
pump rotor assembly.
9Y1210785ENS0100US0
Cylinder liner I.D.
Factory
specifica-
tion
Z482-E4B
D722-E4B
D782-E4B
67.250 to 67.269 mm
2.6477 to 2.6483 in.
Z602-E4B
D902-E4B
72.250 to 72.269 mm
2.8445 to 2.8452 in.
Allowable
limit
Z482-E4B
D722-E4B
D782-E4B
67.400 mm
2.6535 in.
Z602-E4B
D902-E4B
72.400 mm
2.8504 in.
Finishing
Hone to 2.2 to 3.0 μm Rz
(87 to 110 μin. Rz)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. [Oversize]
Rotor lobe clearance Factory specification
0.030 to 0.14 mm
0.0012 to 0.0055 in.
Clearance between outer
rotor and pump body
Factory specification
0.070 to 0.15 mm
0.0028 to 0.0059 in.
Clearance between rotor
and cover
Factory specification
0.0750 to 0.135 mm
0.00296 to 0.00531 in.
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