Subaru IMPREZA GD 2007 Series Manual page 2427

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MECHANICAL
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) Release the fuel
FU(H4DOTC)-55, RELEASING OF FUEL PRES-
SURE, PROCEDURE, Fuel.>
4) Remove all spark plugs. <Ref. to IG(H4DOTC)-
4, REMOVAL, Spark Plug.>
5) Fully open the throttle valve.
6) Check the starter motor for satisfactory perfor-
mance and operation.
7) Hold the compression gauge tightly against the
spark plug hole.
NOTE:
When using a screw-in type compression gauge,
the screw should be less than 18 mm (0.71 in) long.
8) Crank the engine by the starter motor, and read
the maximum value on the gauge when the needle
of gauge is steady.
9) Perform at least two measurements per cylinder,
and make sure that the values are correct.
Compression pressure (at 200 — 300 rpm):
Standard
981 — 1,177 kPa
2
(10 — 12 kgf/cm
Limit
882 kPa (9.0 kgf/cm
Difference between cylinders
49 kPa (0.5 kgf/cm
Compression
pressure. <Ref. to
ME-00007
, 142 — 171 psi)
2
, 128 psi)
2
, 7 psi), or less
ME(H4DOTC)-26