Compression - Subaru Legacy 2003 Service Manual

2. Compression

A: INSPECTION
CAUTION:
After warming-up, engine becomes very hot. Be
careful not to burn yourself during measure-
ment.
1) After warming-up the engine, turn the ignition
switch to OFF.
2) Make sure that the battery is fully charged.
3) Lower the fuel pressure. <Ref. to FU(H4SO)-48,
RELEASING OF FUEL PRESSURE, OPERA-
TION, Fuel.>
4) Remove all the spark plugs. <Ref. to IG(H4SO)-
5, REMOVAL, Spark Plug.>
5) Fully open the throttle valve.
6) Check the starter motor for suitable performance
and operation.
7) Hold the compression gauge tight against spark
plug hole.
NOTE:
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 starter motor, and
then 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;
1,275 kPa (13.0 kg/cm
Limit;
1,079 kPa (11.0 kg/cm
Difference between cylinders;
49 kPa (0.5 kg/cm
COMPRESSION
ME-00192
2
, 185 psi)
2
, 156 psi)
2
, 7 psi), or less
ME(H4SO)-23
MECHANICAL