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5-32 ENGINE TOP END
Valves
Valve Guide Installation
•
Apply oil to the valve guide outer surface before installa-
tion.
•
Heat the area around the valve guide hole to about 120 ∼
150°C (248 ∼ 302°F).
CAUTION
Do not heat the cylinder head with a torch. This Will
warp the cylinder head. Soak the cylinder head and
heat the oil.
•
Using the valve guide driver [A] and washer [B], press
and insert the valve guide in until the valve guide driver
surface [C] touches the head surface [D].
13.3 ∼ 13.5 mm (0.52 ∼ 0.53 in.) [E]
Special Tools - Valve G uide Driver: 57001-1564
Washer: 57001-1612
•
Ream the valve guide with valve guide reamer [A], even
if the old guide is reused.
Special Tool - Valve Guide Reamer, 4.5: 57001-1333
Valve-to-Guide Clearance Measurement (Wobble
Method)
If a small bore gauge is not available, inspect the valve
guide wear by measuring the valve to valve guide clearance
with the wobble method as indicated below.
•
Insert a new valve [A] into the guide [B] and set a dial
gauge against the stem perpendicular to it as close as
possible to the cylinder head mating surface.
•
Move the stem back and forth [C] to measure valve/valve
guide clearance.
•
Repeat the measurement in a direction at a right angle to
the first.
If the reading exceeds the service limit, replace the guide.
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