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Disassembly of cylinder head
Press down valve spring by valve puller,
remove lock clip of valve. Loosen valve puller,
and remove seat of valve spring, spring, inner
spring seat and valve.
Caution: For avoiding permanent distorsion,
excessively press spring is not allowed, only
need to remove valve and lock clip.
All removed parts should make marks for
ensuring its initial installation position when
it is in re-assembling.
Check valve and its guiding tube
Check if there is bending on valve, abnormal
abrasion or ablation on tappet rod of valve.
Check movement of valve in its guiding tube
and measure its outer diameter.
Standard Limit
Intake valve： 4.475～4.49 4.460
Exhaust valve：4.455～4.470 4.440
Insert each valve into guiding tube and observe its
movement
Measure inner diameter of each guiding tube of
valve by internal micrometer, and finally calculate
clearance between tappet rod and guiding tube.
Standard Limit
Guiding tube of intake valve： 4.510～4.522 4.59
Guiding tube of exhaust valve： 4.510～4.522 4.59
Clearance between intake valve and its guiding tube： 0.02～0.047 0.07
Clearance between exhaust valve and its guiding tube：0.04～0.067 0.08
Caution: Clean up carbon buildup in guiding tube
first, and then measure its internal diameter.
In case replacement for guiding tube is needed,
re-grinding for surface of valve seat is necessary
Completely clean up carbon buildup in combustion chamber.
Eliminate remains on plane of cylinder head by scraper.
No damage on plane of cylinder head is allowed.
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