Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
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ME(STI)-78 Cylinder Head MECHANICAL 5. VALVE SPRING 1) Check the valve springs for damage, free length, and tension. Replace the valve spring if it is not within the standard value presented in the table. 2) To measure the squareness of the valve spring, stand the valve spring on a surface plate and mea- sure its deflection at the top of the valve spring us- ing a try square. 6. INTAKE AND EXHAUST VALVE OIL SEAL 1) For the following, replace the oil seal with a new part. See the procedure 2) and subsequent for re- placement procedures. • When the lip is damaged. • When the spring is out of the specified position. • When readjusting the surfaces of valve and valve seat. • When replacing the valve guide. 2) Place the cylinder head on ST1, and use ST2 to press-fit the oil seal. ST1 498267600 CYLINDER HEAD TABLE ST2 498857100 VALVE OIL SEAL GUIDE NOTE: • Apply engine oil to oil seal before press-fitting. • When press-fitting the oil seal, do not use a ham- mer to strike in. • The intake valve oil seals and exhaust valve oil seals are distinguished by their colors. Intake [Gray] Exhaust [Green] Free length mm (in) 53.48 (2.106) Tension/spring Set 204.6 — 235.4 (20.86 — 24.00, Lift 363.5 — 401.7 (37.07 — 40.96, Squareness 2.5°, 2.3 mm (0.091 in) or less ME-00283 ME-00133 ST2 |