Piston And Connecting Rod - wsm B2420 Workshop Manual

B2420, WSM

(3) Piston and Connecting Rod

Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal and
vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
Factory specification
Piston pin bore I.D.
Allowable limit
Oil Clearance between Piston Pin and Small End Bushing
1. Measure the piston pin O.D. where it contacts the bushing with
an outside micrometer.
2. Measure the small end bushing I.D. with an inside micrometer,
and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
bushing. If it still exceeds the allowable limit, replace the piston
pin.
Factory specification
Oil clearance between
piston pin and small end
bushing
Allowable limit
Piston pin O.D. Factory specification
Small end bushing I.D. Factory specification
Replacing Small End Bushing
(When removing)
1. Press out the used bushing using a small end bushing replacing
tool.
(When installing)
1. Clean a new small end bushing and bore, and apply engine oil
to them.
2. Using a small end bushing replacing tool, press in a new
bushing (service parts) taking due care to see that the
connecting rod oil hole matches the bushing hole.
Factory specification
Oil clearance between
piston pin and small end
bushing (Spare parts)
Allowable limit
Small end bushing I.D.
Factory specification
(Spare parts)
(1) Seam
(2) Oil Hole
1-S48
ENGINE
22.000 to 22.013 mm
0.86615 to 0.86665 in.
22.03 mm
0.8673 in.
9Y1210436ENS0082US0
0.014 to 0.038 mm
0.00056 to 0.0014 in.
0.15 mm
0.0059 in.
22.002 to 22.011 mm
0.86622 to 0.86657 in.
22.025 to 22.040 mm
0.86713 to 0.86771 in.
9Y1210436ENS0083US0
0.014 to 0.038 mm
0.00056 to 0.0014 in.
0.15 mm
0.0059 in.
22.025 to 22.040 mm
0.86713 to 0.86771 in.
(A) When Removing
(B) When Installing
(a) 0.79 rad (45 °)
9Y1210436ENS0084US0
KiSC issued 06, 2012 A