Subaru 2009 IMPREZA Service Manual page 288

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(7) Ream the inside of valve guide using ST.

Put the ST in valve guide, and rotate the ST

slowly clockwise while pushing it lightly. Bring

the ST back while rotating it clockwise.

• Apply engine oil to the ST when reaming.

• If the inner surface of valve guide is damaged,

the edge of ST should be slightly ground with oil

• If the inner surface of valve guide becomes lus-

trous and the ST does not chip, use a new ST or

remedy the ST.

ST 499767400

VALVE GUIDE REAMER

(8) After reaming, clean the valve guide to re-

(9) Recheck the contact condition between

valve and valve seat after replacing the valve

Cylinder Head

4. INTAKE AND EXHAUST VALVE

1) Inspect the flange of valve and valve stem, and

replace the valve with a new part if damaged, worn,

deformed, or if dimension "H" in the figure is out-

side of the specified limit.

Head edge thickness H:

0.8 — 1.2 mm (0.03 — 0.047 in)

1.0 — 1.4 mm (0.039 — 0.055 in)

2) Put a small amount of grinding compound on the

valve seat surface, and lap the valve and valve seat

surface. Replace with a new valve oil seal after lap-

It is possible to differentiate between the intake

valve and the exhaust valve by their overall length.

Valve overall length:

120.6 mm (4.75 in)

121.7 mm (4.79 in)