Kawasaki STX-15F Valve Guide Installation, Valve-to-Guide Clearance Measurement Wobble Method

ENGINE TOP END 6-25

Valves

Valve Guide Installation

•Apply engine oil to the valve guide outer surface before installation.

•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, 5: 57001-1203

•Ream the valve guide with valve guide reamer [A] even if the old guide is reused.

Special Tool - Valve Guide Reamer, 5: 57001-1204

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.

NOTE

○The reading is not actual valve/valve guide clearance because the measuring point is above the guide.

Valve/Valve Guide Clearance (Wobble Method)

Standard:
Exhaust	0.09 ∼	0.17 mm (0.0035 ∼	0.0067 in.)
Inlet	0.03 ∼	0.11 mm (0.0012 ∼	0.0043 in.)
Service Limit:
Exhaust	0.35 mm (0.014 in.)
Inlet	0.29 mm (0.011 in.)