Service manual

Page 47 of 151

6-6 Valve Stem Replacement

Heat up cylinder head to 100-150C (212- 300F) with a hot

plate or other device.

Caution

Do not heat the cylinder head directly. Otherwise, the

cylinder head may be deformed.

• Wear a pair of gloves to protect your hands

when operating.

• Hold the cylinder head and press out the old

valve guide from the combustion chamber side.

Tool: Valve guide driver: 5.0 mm

• Check if the new valve guide has deformation after

being pressed it in.

• When pressing in the new valve guide, ensure the

cylinder head is kept at the same temperature

(100-150C).

• Adjust the valve guide driver until the valve guide

height is 13 mm.

• Press in a new valve guide from rocker arm side.

• Wait for the cylinder head to cool down to room

temperature, and then correct the new valve guide

with the reamer.

• Use cutting oil when correcting the valve guide with

a reamer.

• Turn the reamer in same direction when it is inserted

or rotated.

• Adjust the valve seat. Clean all metal residue from

the cylinder head.