ENGINE
B2050, B2350, B2650, B3150, WSM
1-S61
Correcting Cylinder
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.)
• 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 factory specifications, replace the
oil pump rotor assembly.
9Y1210982ENS0110US0
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 factory specifications, replace the
oil pump rotor assembly.
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Clearance between Rotor and Cover
1. Put a strip of plastigauge 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 the
oil pump rotor assembly.
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Oversized cylinder liner
I.D.
Factory specification
78.500 to 78.519 mm
3.0906 to 3.0912 in.
Allowable limit
78.65 mm
3.096 in.
Finishing
Finishing
Hone to 1.2 to 2.0 mm µR max.
(48 to 78 in. µR max.)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. (Oversize)
Rotor lobe clearance Factory specification
0.060 to 0.18 mm
0.0024 to 0.0071 in.
Clearance between outer
rotor and pump body
Factory specification
0.100 to 0.180 mm
0.00394 to 0.00708 in.
Clearance between rotor
and cover
Factory specification
0.025 to 0.075 mm
0.00099 to 0.0029 in.
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