General Description - Subaru IMPREZA 2002 Service Manual

GENERAL DESCRIPTION
I Y P =
Valve arrangement
Bore x Stroke mm (in)
Displacement cm3 (cu in)
1. General Description
A: SPECIFICATIONS
T . n m
I
Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline
engine
Belt driven, single over-head camshaft, 4-valve/cylinder
99.5 x 79.0 (3.91 7 x 3.1 10)
2,457 (1 50)
Engine
Compression pres-
sure (at 200
-
300
kPa ( kgf/cm2, psi)
rpm)
Number of Diston rinas
1,079-1,275 (11.0-13.0, 156-185)
Pressure ring: 2, Oil ring: 1
Opening
Closing
Opening
Closina
Intake valve timing
Exhaust valve timing
-
1" BTDC
51
O
ABDC
50" BBDC
6" ATDC
u
Intake mm (in)
Exhaust mm (in)
rPm
Valve clearance
Idling speed [At neutral position
on MT, or "P"
or
"N" position on
AT1
Firina order
0.20f0.02 (0.0079kO. 0008)
0.25f0.02 (0.0098k0.0008)
MT: 650+100 (No load)
AT: 700f100 (No load)
850k100 (NC switch ON)
1 + 3 - + 2 + 4
u
I
MT: 1 0"+8"/650
AT: 15"f8"/700
Ignition timing BTDC/rpm
Spacer O.D.
Tensioner bush I.D.
NOTE:
STD: Standard I.D.: Inner Diameter O.D.: Outer
Diameter US: Undersize OS: Oversize
17.955
-
17.975 mm (0.7069
-
0.7077 in)
18.00 - 18.08 mm (0.7087 - 0.71 18 in)
Belt ten-
sioner
adjuster
Belt ten-
sioner
Va I ve
rocker arm
Camshaft
STD
Clearance between spacer and bush
Limit
STD
Side clearance of spacer Limit
Protrusion of adjuster rod
0.025
-
0.125 mm (0.0010 - 0.0049 in)
0.175 mm (0.0069 in)
0.20 - 0.55 mm (0.0079
-
0.0217 in)
0.81 mm (0.0319 in)
5.2
-
6.2 mm (0.205
-
0.244 in)
STD
Limit
Clearance between shaft and arm
0.020 - 0.054 mm (0.0008 - 0.0021 in)
0.1 0 mm (0.0039 in)
I
Bend limit
Thrust clearance
STD
Limit
STD
Limit
STD
Limit
Intake
Exhaust
Cam lobe height
Camshaft journal O.D.
Camshaft journal hole I.D.
Oil clearance
STD
Limit
0.020 mm (0.0008 in)
0.030 - 0.090 mm (0.0012 - 0.0035 in)
0.1 1 mm (0.0043 in)
39.485
-
39.585 mm (1.5545
-
1.5585 in)
39.385 mm (1.5506 in)
39.257
-
39.357 mm (1.5455
-
1.5495 in)
39.157 mm (1.5416 in)
31.928
-
31.945 mm (1.2570 - 1.2577 in)
32.000
-
32.018 mm (1.2598
-
1.2605 in)
0.055 - 0.090 mm (0.0022 - 0.0035 in)
0.10 mm (0.0039 in)
ME( SOH C)-2