Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2007OUTBACK LIMITED, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE MECHANICALTIMING BELTENGINE MECHANICAL (H4SO)COMPRESSIONINSPECTION

2007 Subaru Outback Limited, 4D Sedan, Standard

Engine Mechanical (H4SO): Compression: Inspection

2007 Subaru Outback Limited, 4D Sedan, StandardSECTION Inspection

CAUTION: After warming-up, engine becomes very hot. Be careful not to burn yourself during measurement.

After warming-up the engine, turn the ignition switch to OFF.
Make sure that the battery is fully charged.
Release the fuel pressure. <Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel .>
Remove all spark plugs. <Ref. to REMOVAL , Spark Plug .>
Fully open the throttle valve.
Check the starter motor for satisfactory performance and operation.
Hold the compression gauge tightly against the 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.
Crank the engine by the starter motor, and read the maximum value on the gauge when the needle of gauge is steady.

Fig 1: Checking Compression Of Engine Using Compression Gauge
Courtesy of SUBARU OF AMERICA, INC.
Perform at least two measurements per cylinder, and make sure that the values are correct.
Compression (350 rpm and fully open throttle):

Standard: 1,020 - 1,275 kPa (10.4 - 13.0 kgf/cm ² , 148 - 185 psi)

Difference between cylinders: 49 kPa (0.5 kgf/cm ² , 7 psi), or less

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.