Compression - Subaru Legacy 2002 Service Manual

Mechanical

2. Compression

A: INSPECTION
CAUTION:
After warming-up, engine becomes very hot.
Be careful not to burn yourself during mea-
surement.
1) After warming-up the engine, turn ignition
switch to OFF.
2) Make sure that the battery is fully charged.
3) Release fuel pressure. <Ref. to FU-54,
RELEASING OF
OPERATION, Fuel.> or <Ref. to FU(w/oOBD)-48,
RELEASING OF
OPERATION, Fuel.>
4) Remove all the spark plugs. <Ref. to IG-4,
REMOVAL, Spark Plug.> or <Ref. to IG(w/
oOBD)-4, REMOVAL, Spark Plug.>
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.
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/cm
Limit;
941 kPa (9.6 kg/cm
Difference between cylinders;
49 kPa (0.5 kg/cm
COMPRESSION
S173081
S173081A10
FUEL PRESSURE,
FUEL PRESSURE,
B2M3133
2
, 176 psi)
2
, 137 psi)
2
, 7 psi), or less
ME-24