12.5 Valve Guide Replacement
* Attention:
When the clearance between valve and valve guide exceeds
service limit value, please replace the valve guide. When a
valve guide is replaced, surface of valve seat retainer shall be fixed and adjusted.
Put the valve guide into the freezing chamber of refrigerator for
one hour to freeze it.
Heat with electric furnace or oven the cylinder head to
100-150.
Fix the cylinder head and remove the valve guide from upper
side of cylinder head with a special valve guide remover.
Install a new O ring onto the new valve guide.
Install the valve guide from the top of cylinder head.
* Attention: Please do not hurt cylinder head while installing valve guide.
When the valve guide is inserted, fix and adjust it with a valve
guide reamer.
* Attention: When a reamer is used to cut, please apply
some amount of cutting lubricant onto it.
Rotate the reamer in clockwise direction.
Remove carbon deposited in combustion chamber and valve
and clean thoroughly intake and exhaust valves.
Inspect width of contact surface of valve seat（width of valve
race）
Allowable limit: intake/exhaust: 1.6mm.
Opener
Valve reamer
Valve seat contact surface
Opener
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