Page 1401 - Workshop Manual - Tunland (2017)

ENGINE MECHANICAL - CYLINDER HEAD,VALVE 15-65

(a) Check whether the valve has carbon deposits.
If so, clean the valve thoroughly with steel
brush.

15

(b) Check whether the working surface of the
valve and the valve seat is airtight. If not,
polish it with a valve polisher. The contact
surface of the valve seat shall be consistent
with the center of the valve working face.
(c) Check whether the valve has ablation, dents
and carbon stains, and if so, remove them.
(d) Check whether the angle of the valve surface
is 45 degrees. If not, grind it to 45 degrees.

(e) Check the valve head thickness 。

Intake valve head thickness limit: 1.10mm
Exhaust valve head thickness limit:1.90mm

CAUTION
If the intake or exhaust valve head thickness is
less than the minimum, the replacement the
valve.

(h) Check the total height of the valve. Replace
it if below limit:
CAUTION

• If the top surface of the valve stem is worn,
grind the valve surface with the grinding
rod or replace the valve.
• The valve length must not be reduced to
less than the minimum.