Engine Ignition System - Ignition (H6DO - 3.6L DOHC): Other Subaru Legacy BM/BR

CAUTION

1. Wear appropriate work clothing, including a cap, protective goggles and protective shoes when performing any work.
2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
3. Keep the disassembled parts in order and protect them from dust and dirt.
4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly and replacement.
5. Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.
6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
7. Place shop jacks or rigid racks at the specified points.
8. Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from the battery.

RH SIDE

Install in the reverse order of removal.

Tightening torque

Spark plug

21 N.m (2.1 kgf-m, 15.5 ft-lb)

Ignition coil

16 N.m (1.6 kgf-m, 11.8 ft-lb)

Bracket (A)

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

LH SIDE

Install in the reverse order of removal.

Tightening torque

Spark plug

21 N.m (2.1 kgf-m, 15.5 ft-lb)

Ignition coil

16 N.m (1.6 kgf-m, 11.8 ft-lb)

Bracket (A)

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. Check the spark plug for abnormalities. If defective, replace the spark plug.
2. Check the spark plug electrode and condition of the insulator. If abnormal, check and repair the cause and replace the spark plug. Normal: Brown to grayish-tan deposits and slight electrode wear indicate correct spark plug heat range. Carbon fouled: Dry fluffy carbon deposits on insulator and electrode are mostly caused by slow speed driving in the city, weak ignition, too rich fuel mixture, etc. Oil fouled: Wet black deposits show oil entrance into combustion chamber through worn piston rings or increased clearance between valve guides and valve stems. Overheating: White or light gray insulator with black or brown spots and bluish burnt electrodes indicate engine overheating, wrong selection of fuel, or loose spark plugs.
3. Using a nylon brush, etc., clean and remove the carbon or oxide deposits from the spark plug. If deposits are too stubborn, replace the spark plugs. After cleaning the spark plugs, check the spark plug gap "L" using a gap gauge. If it is not within the standard, replace the spark plug. NOTE: Never use a plug cleaner. Do not use a metal brush as it may damage the electrode area. Spark plug gap L: Standard 1.0 - 1.1 mm (0.039 - 0.043 in)