Subaru 2009 IMPREZA Service Manual page 222

MECHANICAL
Piston grade point
Piston
Outer diameter
Degree of fit
Piston pin
Clearance between piston hole and
piston pin
Piston ring gap
Piston ring
Clearance between piston ring
and piston ring groove
Bend or twist per 100 mm (3.94 in) in
length
Thrust clearance
Connecting
Oil clearance
rod and
connecting
rod bearing
Bearing size
(Thickness at center)
Bushing of Clearance between piston pin and
small end bushing
Bending limit
Crank pin
Crank journal
Crank pin outer diameter
Crankshaft
and
crankshaft
Crank journal outer diameter
bearing
Bearing size
(Thickness at center)
Thrust clearance
Oil clearance
General Description
Standard
mm (in)
0.25 (0.0098) OS
0.50 (0.0197) OS
mm (in) Standard
Top ring
mm (in) Second ring Standard
Oil ring
Top ring
mm (in)
Second ring Standard
mm (in) Limit
mm (in) Standard
mm (in) Standard
Standard
0.03 (0.0012) US
mm (in)
0.05 (0.0020) US
0.25 (0.0098) US
mm (in) Standard
Out-of-roundness
Cylindricality
Grinding limit (dia.)
Out-of-roundness
Cylindricality
Grinding limit (dia.)
Standard
0.03 (0.0012) US
mm (in)
0.05 (0.0020) US
0.25 (0.0098) US
Standard
0.03 (0.0012) US
mm (in)
0.05 (0.0020) US
0.25 (0.0098) US
Standard
0.03 (0.0012) US
#1, #3
0.05 (0.0020) US
0.25 (0.0098) US
mm (in)
Standard
0.03 (0.0012) US
#2, #4,
#5
0.05 (0.0020) US
0.25 (0.0098) US
mm (in) Standard
mm (in) Standard
ME(H4SO)-4
mm (in) 38.2 (1.504)
A 99.505 — 99.515 (3.9175 — 3.9179)
B 99.495 — 99.505 (3.9171 — 3.9175)
99.745 — 99.765 (3.9270 — 3.9277)
99.995 — 100.015 (3.9368 — 3.9376)
Piston pin must be fitted into position with
thumb at 20°C (68°F).
0.004 — 0.008 (0.0002 — 0.0003)
Standard 0.20 — 0.35 (0.0079 — 0.0138)
0.37 — 0.52 (0.0146 — 0.0205)
Standard 0.20 — 0.50 (0.0079 — 0.0197)
Standard 0.040 — 0.080 (0.0016 — 0.0031)
0.030 — 0.070 (0.0012 — 0.0028)
0.10 (0.0039)
0.070 — 0.330 (0.0028 — 0.0130)
0.016 — 0.044 (0.0006 — 0.0017)
1.492 — 1.501 (0.0587 — 0.0591)
1.510 — 1.513 (0.0594 — 0.0596)
1.520 — 1.523 (0.0598 — 0.0600)
1.620 — 1.623 (0.0638 — 0.0639)
0 — 0.022 (0 — 0.0009)
mm (in) 0.035 (0.0014)
mm (in) 0.003 (0.0001)
mm (in) 0.004 (0.0002)
mm (in) To 51.750 (2.0374)
mm (in) 0.005 (0.0002)
mm (in) 0.006 (0.0002)
mm (in) To 59.758 (2.3527)
51.984 — 52.000 (2.0466 — 2.0472)
51.954 — 51.970 (2.0454 — 2.0461)
51.934 — 51.950 (2.0446 — 2.0453)
51.734 — 51.750 (2.0368 — 2.0374)
59.992 — 60.008 (2.3619 — 2.3625)
59.962 — 59.978 (2.3607 — 2.3613)
59.942 — 59.958 (2.3599 — 2.3605)
59.742 — 59.758 (2.3520 — 2.3527)
1.998 — 2.011 (0.0787 — 0.0792)
2.017 — 2.020 (0.0794 — 0.0795)
2.027 — 2.030 (0.0798 — 0.0799)
2.127 — 2.130 (0.0837 — 0.0839)
2.000 — 2.013 (0.0787 — 0.0793)
2.019 — 2.022 (0.0795 — 0.0796)
2.029 — 2.032 (0.0799 — 0.0800)
2.129 — 2.132 (0.0838 — 0.0839)
0.030 — 0.115 (0.0012 — 0.0045)
0.010 — 0.030 (0.0004 — 0.0012)