Subaru Impreza 2004 User Manual download pdf (Page 9)

ME(H4DOTC)-8

MECHANICAL

General Description

Cylinder

block

Surface warpage limit (mating with cylinder head) 0.05 mm (0.0020 in)

Surface grinding limit 0.1 mm (0.004 in)

Cylinder bore STD

A 92.005 — 92.015 mm (3.6222 — 3.6226 in)

B 91.995 — 92.005 mm (3.6218 — 3.6222 in)

Taper

STD 0.015 mm (0.0006 in)

Limit 0.050 mm (0.0020 in)

Out-of-roundness

STD 0.010 mm (0.0004 in)

Limit 0.050 mm (0.0020 in)

Piston clearance

STD 0.010 — 0.030 mm (0.0004 — 0.0012 in)

Limit 0.050 mm (0.0020 in)

Enlarging (boring) limit 0.5 mm (0.020 in)

Piston Outer diameter

STD

A 91.985 — 91.995 mm (3.6214 — 3.6218 in)

B 91.975 — 91.985 mm (3.6211 — 3.6214 in)

0.25 mm (0.0098 in)

OS

92.225 — 92.235 mm (3.6309 — 3.6313 in)

0.50 mm (0.0197 in)

OS

92.475 — 92.485 mm (3.6407 — 3.6411 in)

Piston pin

Standard clearance between piston

pin and hole in piston

STD 0.004 — 0.008 mm (0.0002 — 0.0003 in)

Limit 0.020 mm (0.0008 in)

Degree of fit

Piston pin must be fitted into position with thumb at 20°C

(68°F).

Piston ring

Piston ring gap

Top ring

STD 0.20 — 0.25 mm (0.0079 — 0.0098 in)

Limit 1.0 mm (0.039 in)

Second

ring

STD 0.40 — 0.50 mm (0.016 — 0.020 in)

Limit 1.0 mm (0.039 in)

Oil ring

STD 0.20 — 0.50 mm (0.0079 — 0.020 in)

Limit 1.5 mm (0.059 in)

Clearance between piston

ring and piston ring

groove

Top ring

STD 0.040 — 0.080 mm (0.0016 — 0.0031 in)

Limit 0.15 mm (0.0059 in)

Second

ring

STD 0.030 — 0.070 mm (0.0012 — 0.0028 in)

Limit 0.15 mm (0.0059 in)

Connecting

rod

Bend or twist per 100 mm (3.94 in) in

length

Limit 0.10 mm (0.0039 in)

Side clearance

STD 0.070 — 0.330 mm (0.0028 — 0.0130 in)

Limit 0.4 mm (0.016 in)

Connecting

rod bearing

Oil clearance

STD 0.020 — 0.046 mm (0.0008 — 0.0018 in)

Limit 0.05 mm (0.0020 in)

Thickness at center portion

STD 1.486 — 1.498 mm (0.0585 — 0.0590 in)

0.03 mm

(0.0012

in) US

1.504 — 1.512 mm (0.0592 — 0.0595 in)

0.05 mm

(0.0020

in) US

1.514 — 1.522 mm (0.0596 — 0.0599 in)

0.25 mm

(0.0098

in) US

1.614 — 1.622 mm (0.0635 — 0.0639 in)

Connecting

rod bushing

Clearance between piston pin and

bushing

STD 0 — 0.022 mm (0 — 0.0009 in)

Limit 0.030 mm (0.0012 in)

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