Valve Guide Installation
Apply oil to the valve guide outer surface before installa-
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 in
oil and heat the oil.
Using the valve guide driver [A], press and insert the valve
guide [B] in until its snap ring touches the head surface.
Special Tool - Valve Guide Driver: 57001-1564
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 clockwaise 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, 6: 57001-1596
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)
0.07 ∼ 0.14 mm (0.0028 ∼ 0.0055 in.)
0.04 ∼ 0.10 mm (0.0016 ∼ 0.0039 in.)
0.30 mm (0.012 in.)
0.25 mm (0.010 in.)
ENGINE TOP END 5-43