Service manual

Page 46 of 151

Valve guide

• Before measuring the valve guide, clean any

carbon deposits with a reamer.

Tool: 5.0 mm valve guide reamer

• Measure and record each valve guide inner

diameter.

Service limit: 5.03 mm

• The inner diameter of the valve guide minus the

outer diameter of the valve stem is the clearance

between the valve stem and valve guide.

Service Limit:

IN→0.08 mm

EX→0.10 mm

• If clearance between the valve stem and valve guide

exceeds the service limit, check whether replacing

the valve guide will bring it into service limit.

If so, replace just the valve guide.

• If clearance still exceeds the service limit after

replacing the valve guide, replace the valve stem as well.

• Do not damage the valve seat when replacing the valve

guide.