Rato R5500, Руководство по обслуживанию

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3. TROUBLESHOOTING
42
Reamer
For best results, be sure the cylinder head is at
room temperature before reaming valve guides.
a) Coat the reamer and valve guide with
cutting oil.
b) Rotate the reamer clockwise through the
valve guide for the full length of the
reamer.
c) Continue to rotate the reamer clockwise
while removing it from the valve guide.
Tools
：
Valve guide reamer
d) Thoroughly clean the cylinder head to remove any cutting residue.
e) Check the valve guide bore, it should be straight, 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.
f) Check the valve stem-to-guide clearance
g) The valve stem-to-guide clearance
：
The vale guide bore detract the valve stem outside
diameter to get the clearance between the valve guide and valve stem.
h) If the clearance is over the service limit, judge a new guide if it can make the clearance
Conforming to service limit, if conforming to, replace the guide and ream the guide,
refinish the valve when replacing the valve.
④
Valve seat
：
a) Toughly clean the combustion
chambers and valve seats to
remove carbon deposits. Apply a
light coat of red lead powder or
erasable color painting to the valve
faces.
正确
错误
CORRECT WRONG
VALVE FACE