Page 1440 - Foton Workshop Manual - Tunland (AT)

15-66 ENGINE MECHANICAL - CYLINDER HEAD,VALVE

8 . Check the clearance between the valve
guide and the valve rod. Replace either or
both of them if beyond limit, until the
clearance meets the requirement.

Valve tappet diameter:5.98～5.996mm

15

9 . Follow the steps to replace the valve guide:
NOTICE

• Do not use a new valve guide of the same dimension as the removed one.

(a) Heat the cylinder head and remove the valve seat.
(b) With a tool, drive out the valve guide towards the lower surface of the cylinder head.
(c) Treat the valve guide hole on the cylinder head so that the diameter meets the
dimension of a larger guide.

Valve hole diameter:6.042～6.062mm

NOTICE

• If the wear of valve guide hole exceed the maximum value, or the valve guide
rod id damaged, replace the cylinder cap.

10 . Check the valve seat:
(a) Carefully fix the carbon deposits on the
surface of the valve seat by using a 45 degree
reamer.
(b) Check the valve seat indentation must be
around 360 degrees and concentric with the
valve guide and valve seat. Otherwise, the
valve cone must be ground again
(c) Check that the valve seat indentation is in the
middle of the valve seat and the width is within
the standard range. If not, trim the valve seat.
(Refer to "Chapter 15 Engine mechanical
system - Cylinder Head, Valve, Valve
Overhaul")

11 . Finish the valve seat:

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