SECTION 4. DISASSEMBLY AND SERVICE
measuring.
Replace valve guides if their inner diameters are smaller than
standard value or beyond service limit.
Replace:
a) Put replacement valve guides in a refrigerator’s freezing
chamber to freeze it for about 1 hour.
b) Use a valve guide driver to remove valve guides from the combustion chamber side.
Be careful not to damage cylinder head when removing
valve guides
c) install new guides from cylinder head’s valve spring side.
Exhaust valve side: Drive exhaust valve guide until the clip
fully contacts cylinder head.
Intake valve side: Drive intake valve guide until it reaches
specified height (measured from guide top to cylinder head surface.)
d) After installing, check valve guide for damage, if so, it must be replace.
Ream:
For best results, be sure the cylinder head is at room before
reaming valve guides.
a) Coat the reamer and valve guide with cutting oil. Rotate the
reamer clockwise through the valve guide for the full length of
the reamer. Continue to rotate the reamer clockwise while
removing it from the valve guide.
Tools：Valve guide reamer
b) Thoroughly clean the cylinder head to remove cutting residue and other dirty matters.
c) Check the valve guide bore, it should be straight, unobstructed, round and centered in the valve guide,
insert the valve and check operation. If the valve does not operate smoothly, the guide may have been bent
during installation. Replace the valve guide if it is bent or damaged.
Standard Service limit
5.012 mm 5.072 mm
DRIVER
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