5. Inspection and Servicing of Basic Engine Parts
100
(4) Valve guide
1) Measuring inside diameter of valve guide.
Measure the inside diameter of the valve guide and replace it if it exceeds the wear limit.
NOTE: The inside diameter standard dimensions assume a pressure fit.
2) Replacing the valve guide
Use the insertion tool and tap in the guide with a
mallet.
The intake valve guide and exhaust valve guide
are of different dimensions.
3) Valve guide projection
The valve guide should project 15mm from the top
of the cylinder head.
4) Valve stem seals
The valve stem seals in the intake/exhaust valve
guides cannot be re-used once they are removed
- be sure to replace them.
When assembling the intake/exhaust valves,
apply an adequate quantity of engine oil on the
valve stem before inserting them.
Exhaust stem seal is marked by yellow. Intake
stem seal is not marked.
mm
Standard Limit
Valve guide
inside dia.
Intake Ø8.010-Ø8.025 Ø8.2
Exhaust Ø8.015-Ø8.030 Ø8.2
Clearance
Intake 0.035-0.070 0.18
Exhaust 0.045-0.075 0.18
Tool
Valve guide
Tool
Valve guide
Cylinder head
Projection
Stem seal
Valve guide
19
0
-0.3
15
0
-0.3
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