Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 1999-2000 ENGINE SECTION On-Car Services MSA5T0122A27561

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MSA5T0122A27561


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2-2   [W4A0]                       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
                                                       CAUTION:
Diagnostics II System". 
                                                       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) Disconnect battery ground cable.
                                                       4) Remove all the spark plugs. 
                                                       5) Disconnect connectors from fuel injectors.
                                                       6) Connect battery ground cable.
                                                       7) Fully open throttle valve.
                                                       8) Check the starter motor for satisfactory perfor-
                                                       mance and operation.
                                                       9) 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.
                                                       10) Crank the engine by means of the starter
                                                       motor, and read the maximum value on the gauge
                                                       when the pointer is steady.




                                                                                                S2M0539

                                                       11) Perform at least two measurements per
                                                       cylinder, and make sure that the values are correct.
                                                       Compression (350 rpm and fully open
                                                       throttle):
                                                         Standard;
                                                            1,079 -- 1,275 kPa (11.0 -- 13.0 kg/cm2,
                                                            156 -- 185 psi)
                                                         Limit;
                                                            1,020 kPa (10.4 kg/cm2, 148 psi)
                                                         Difference between cylinders;
                                                            49 kPa (0.5 kg/cm2, 7 psi), or less




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