5-26 ENGINE TOP END
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).
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, 4.5: 57001-1331
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, 4.5: 57001-1333
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.)
0.02 ∼ 0.08 mm (0.0008 ∼ 0.0032 in.)
0.27 mm (0.0106 in.)
0.22 mm (0.0087 in.)