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 MSA5TCD99L25

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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

5
2-2 [W6A0] SERVICE PROCEDURE
6. Engine Oil Pressure

Diagnosis of engine condition by measurement of manifold vacuum
Vacuum gauge indication Possible engine condition
1. Needle is steady but lower than normal position. This ten- Leakage around intake manifold gasket or disconnection or
dency becomes more evident as engine temperature rises. damaged vacuum hose
2. When engine speed is reduced slowly from higher speed, Back pressure too high, or exhaust system clogged
needle stops temporarily when it is lowering or becomes
steady above normal position.
3. Needle intermittently drops to position lower than normal Leakage around cylinder
position.
4. Needle drops suddenly and intermittently from normal posi- Sticky valves
tion.
5. When engine speed is gradually increased, needle begins Weak or broken valve springs
to vibrate rapidly at certain speed, and then vibration
increases as engine speed increases.
6. Needle vibrates above and below normal position in narrow Defective ignition system or throttle chamber idle adjustment
range.

6. Engine Oil Pressure (3) Loosen lock bolt and slider bolt, and remove
V-belt for generator.
A: MEASUREMENT (4) Remove generator lock bolt.
1) Disconnect battery ground cable. (5) Remove bolt which install generator on
2) Remove generator from bracket. bracket.
(1) Disconnect connector and terminal from
generator.

G2M0090

3) Disconnect connector from oil pressure switch.
G2M0088 4) Remove oil pressure switch from engine cylin-
(2) Remove V-belt cover der block.

G2M0091
G2M0089

5) Connect oil pressure gauge hose to cylinder
block.
6) Connect battery ground cable.
7) Start the engine, and measure oil pressure.

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