Valve Guide Installation
Apply engine oil to the valve guide outer surface before
Heat the area around the valve guide hole to about 120 ∼
150°C (248 ∼ 302°F).
Do not heat the cylinder head with a torch. This will
warp the cylinder head. Soak the cylinder head and
heat the oil.
Drive the valve guide in from the top of the head using the
valve guide arbor. The flange stops the guide from going
in too far.
Special Tool - Valve Guide Arbor, 4: 57001-1273
Wait until the cylinder head cools down and then ream the
valve guide with the valve guide reamer [A] even if the old
guide is reused.
Turn the reamer in a clockwise direction until the reamer
turns freely in the guide. Never turn the reamer counter-
clockwise or it will be dulled.
Once the guides are reamed they must be cleaned thor-
Special Tool - Valve Guide Reamer, 4: 57001-1274
Valve-to-Guide Clearance Measurement (Wobble
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
Repeat the measurement in a direction at a right angle to
If the reading exceeds the service limit, replace the guide.
The reading is not actual valve/valve guide clearance
because the measuring point is above the guide.
Valve/Valve Guide Clearance (Wobble Method)
0.10 ∼ 0.18 mm (0.0039 ∼ 0.0071 in.)
0.03 ∼ 0.12 mm (0.0012 ∼ 0.0047 in.)
0.40 mm (0.016 in.)
0.33 mm (0.013 in.)
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ENGINE TOP END 5-23