2006 Subaru Forester Owner's Manual - Page 290
2006 Subaru Forester Manual
Page 290 highlights
Maintenance and service 11-17 Spark plugs Recommended spark plugs Non-turbo models: FR5AP-11 (NGK) Turbo models: ILFR6B (NGK) Drive belts 1 B 2 A B00027 3 1) Power steering pump pulley 2) Air conditioner compressor pulley 3) Crank pulley B00365 It may be difficult to replace the spark plugs. It is recommended that you have the spark plugs replaced by your SUBARU dealer. The spark plugs should be replaced according to the maintenance schedule in the "Warranty and Maintenance Booklet". The alternator, power steering pump, and air conditioner compressor depend on drive belts. Satisfactory performance requires that belt tension be correct. To check belt tension, place a straightedge (ruler) across two adjacent pulleys and apply a force of 22 lbs (98 N, 10 kg) midway between the pulleys by using a spring scale. Belt deflection should be the amount specified. If a belt is loose, cracked, or worn, contact your SUBARU dealer. - CONTINUED - When disconnecting the spark plug cables, always grasp the spark plug cap, not the cables. Make sure the cables are replaced in the correct order.