Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1997 1997 Service Manual ENGINE SECTION ON-CAR SERVICES MSA5TCD97L3443
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4. Engine Compression
4. Engine Compression
A: MEASUREMENT
1. 2200 cc MODEL
1) After warming-up the engine, turn ignition switch to
OFF.
2) Make sure that the battery is fully charged.
3) Remove all the spark plugs.
4) Disconnect connectors from fuel injectors.
5) Fully open throttle valve.
6) Check the starter motor for satisfactory performance
and operation.
7) Hold the compression gauge tight against the spark
plug hole.
CAUTION:
When using a screw-in type compression gauge, the
screw (put into cylinder head spark plug hole) should
be less than 18 mm (0.71 in) long.
8) Crank the engine by means of the starter motor, and
read the maximum value on the gauge when the pointer is
G2M0098
steady.
9) Perform at least two measurements per cylinder, and
make sure that the values are correct.
Compression (200 -- 300 rpm and fully open throttle):
Standard
1,079 -- 1,275 kPa
(11.0 -- 13.0 kg/cm2, 156 -- 185 psi)
Limit
883 kPa (9.0 kg/cm2, 128 psi)
Difference between cylinders
196 kPa (2.0 kg/cm2, 28 psi)
2. 2500 cc MODEL
CAUTION:
After warming-up, engine becomes very hot. Be care-
ful not to burn yourself during measurement.
1) After warming-up the engine, turn ignition switch to
OFF.
2) Make sure that the battery is fully charged.
3) Remove all the spark plugs.
4) Disconnect connectors from fuel injectors.
4
2-2
4. Engine Compression
5) Fully open throttle valve.
6) Check the starter motor for satisfactory performance
and operation.
7) Hold the compression gauge tight against the spark
plug hole.
CAUTION:
When using a screw-in type compression gauge, the
screw (put into cylinder head spark plug hole) should
be less than 18 mm (0.71 in) long.
8) Crank the engine by means of the starter motor, and
read the maximum value on the gauge when the pointer is
steady.
B2M0752A
9) Perform at least two measurements per cylinder, and
make sure that the values are correct.
Compression (350 rpm and fully open throttle):
Standard
1,216 kPa
(12.4 kg/cm2, 176 psi)
Limit
941 kPa (9.6 kg/cm2, 137 psi)
Difference between cylinders
49 kPa (0.5 kg/cm2, 7 psi), or less
5
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