wsm wg972-e4, Workshop Manual

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ENGINE
WG972-E4, WSM
1-S57
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: 0.5 mm (0.02 in.)
Marking: 05
NOTE
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
9Y1211108ENS0098US0
(7) 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.
9Y1211108ENS0099US0
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.
9Y1211108ENS0100US0
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.
9Y1211108ENS0101US0
Cylinder liner I.D.
Factory specification
75.000 to 75.019 mm
2.9528 to 2.9535 in.
Allowable limit
75.150 mm
2.9587 in.
Finishing
Hone to 2.2 to 3.0 µmRz
(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.
KiSC issued 07, 2015 A