Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1999 1999 Service Manual ENGINE SECTION ON-CAR SERVICES MSA5TCD99L24

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2-2 [W4A1] SERVICE PROCEDURE
4. Engine Compression

CAUTION: 4. Engine Compression
Never rotate idle adjusting screw. If idle speed
is out of specifications, refer to General On- A: MEASUREMENT
board Diagnosis Table under "2-7 On-Board
Diagnostics II System". 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 perfor-
mance 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.

G2M0098

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)

4
SERVICE PROCEDURE [W5A0] 2-2
5. Intake Manifold Vacuum

2. 2500 cc MODEL 5. Intake Manifold Vacuum
CAUTION:
After warming-up, engine becomes very hot. A: MEASUREMENT
Be careful not to burn yourself during mea- 1) Warm-up the engine.
surement. 2) Disconnect the brake vacuum hose and install
1) After warming-up the engine, turn ignition the vacuum gauge to the hose fitting on the mani-
switch to OFF. fold.
2) Make sure that the battery is fully charged. 3) Keep the engine at the idle speed and read the
3) Remove all the spark plugs. By observing the gauge needle movement, the
4) Disconnect connectors from fuel injectors. internal condition of the engine can be diagnosed
5) Fully open throttle valve. as described below.
6) Check the starter motor for satisfactory perfor-
mance 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,
H2M1601
and read the maximum value on the gauge when
the pointer is steady.
Vacuum pressure (at idling, A/C "OFF"):
Less than -60.0 kPa (-450 mmHg, -17.72
inHg)

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

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