DAELIM NS125III - SERVICE, Service Manual

Page: 101 / 203

Cylinder Head/Valve
●
Support the cylinder head, and strike and remove
the valve guide from the combustion chamber by
using a valve guide driver.
Tool: Valve guide driver
NOTE
● Install new O-ring and new valve guide.
● Insert the valve guide from the top of the cylinder
head.
Tool: Valve guide driver
● After inserting the valve guide, insert the valve
guide reamer through the cylinder head
combustion chamber side to trim the valve guide.
CAUTION
Tool: Valve guide reamer
● Clean the cylinder head to remove foreign
matters.
● Check the valve seat border, and adjust properly.
Valve Seat
Inspection/Adjustment
● Remove carbon deposits from the valve.
●
Apply a light coating of prussian blue to the
cylinder head valve seat.
●
Gently strike the valve with the valve guide
reamer, without turning the valve, to accurately
set the fit position.
9-8
Take precautions not to damage the cylinder head.
Make sure the reamer is not tilted when trimming
the valve guide. If the reamer is tilted when
cutting, the valve hole will also be tilted, causing
the stem seal to leak, or the valve seat border will be
expanded excessively to an uncorrectable extent.
Insert the reamer while turning it clockwise. If the
reamer is inserted while turning it counterclock-
wise, or without turning, the guide interior part will
be damaged.
Valve guide reamer
Valve guide driver