Subaru Legacy BN/BS (2015-2019) Service Manual: Compression inspection
CAUTION: After warming-up, engine becomes very hot. Be careful not to burn yourself during measurement. NOTE: • Before checking the compression pressure, the compression condition of each cylinder can be confirmed as a guide by using the compression measurement mode in Subaru Select Monitor. Active Test > OPERATION • In the compression measurement mode, the compression condition is judged by each cylinder speed. The high speed cylinder has low compression pressure and low speed cylinder has high compression pressure. 1. After warming-up the engine, turn the ignition switch to OFF. 2. Make sure that the battery is fully charged. 3. Check the starter motor for satisfactory performance and operation. 4. Remove the fuse of fuel pump from main fuse box.
5. Start the engine and run it until it stalls. 6. After the engine stalls, crank it for five more seconds. 7. Turn the ignition switch to OFF. 8. Remove all spark plugs. Spark Plug > REMOVAL 9. Install the compression gauge to the spark plug hole. NOTE: When using a screw-in type compression gauge, the screw should be less than 25 mm (0.98 in) long.
10. Install the battery. Battery > INSTALLATION 11. Turn the ignition switch to ON. 12. Depress the accelerator pedal to full throttle. 13. Crank the engine by starter motor and read the value when the needle of the compression gauge becomes stable. NOTE: • Perform at least two measurements per cylinder, and make sure that the values are correct. • If the compression pressure is out of standard, check or adjust the pistons, valves and cylinders. Compression pressure (at 200 — 300 r/min): Standard 1,050 — 1,400 kPa (11 — 14 kgf/cm2, 152 — 203 psi) Difference between cylinders 100 kPa (1 kgf/cm2, 14 psi) or less 14. After inspection, install the related parts in the reverse order of removal. |
Mechanical(h4do)
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Connecting rod specification
Refer to “Cylinder Block” for removal and installation procedures of connecting rod. Cylinder Block > REMOVAL Cylinder Block > INSTALLATION ...
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Basic diagnostic procedure procedure
NOTE:Refer to STEERING RESPONSIVE FOG LIGHTS (DIAGNOSTICS) for models with steering responsive fog light system. Basic Diagnostic ProcedureSTEPCHECKYESNO1.PERFORM CUSTOMER INTERVIEW.Using the Check List for Interview, ask the customer the condition of how the trouble occurred. Check List for Inter ...
