Piston And Connecting Rod - wsm wg972-e4 Workshop Manual

WG972-E4, WSM

(4) 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 O.D. of the piston pin 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. (Refer to G-31.)
(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 hole matches the bushing hole.
[Servicing parts dimension]
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-S49
ENGINE
20.000 to 20.013 mm
0.78741 to 0.78791 in.
20.05 mm
0.7894 in.
9Y1211108ENS0085US0
0.012 to 0.038 mm
0.00048 to 0.0014 in.
0.10 mm
0.0039 in.
20.002 to 20.013 mm
0.78748 to 0.78791 in.
20.025 to 20.040 mm
0.78839 to 0.78897 in.
9Y1211108ENS0086US0
0.013 to 0.075 mm
0.00052 to 0.0029 in.
0.15 mm
0.0059 in.
20.026 to 20.077 mm
0.78843 to 0.79043 in.
(A) When Removing
(B) When Installing
(a) 0.79 rad (45 °)
9Y1211108ENS0087US0
KiSC issued 07, 2015 A