Chapter V Disassembly & Repair
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seat.
4. Grind the valve seat with a 45° grinder to make the valve seat smooth and concentric; operate as per the
manual of valve seat grinder provided by the manufacturer.
Rotate the grinder clockwise and the anticlockwise rotation is not allowed.
Lift the valve seat grinder from the valve seat and continue grinding.
5. Shorten and adjust the valve seat a 30°-32° and 60° grinders,
Make the valve seat connect with the central part of the valve surface.
Grind the top edge of the valve seat with a 30°-32° grinder.
Grind the bottom edge of the valve seat with a 60° grinder.
Assure the contact width of valve seat after completion is within
the specified scope.
Width of valve seat
1. Slightly grind with the 45° grinder to remove any burr at the edge
of valve seat.
2. After trim the valve seat again, check that after the valve is put in,
if it contacts evenly.
3. Coat a thin layer of blue crocus on the surface of the valve or ink
of marking pen which is easily to be erased.
4.
Insert into the valve and press it for several times to make it tightly
close to the valve seat. Assure not to rotate the valve on the valve seat.
If colorant is evenly coated on the conical side of the valve seat as
shown in the figure, it indicates that the contact between valve and valve
seat is good.
Note:
To avoid severe engine damages, thoroughly remove the abradant
on the cylinder head prior to assembly.
5. Check the valve clearance after assembly.
Standard
Maintenance Limit
0.7~0.8 mm 2.0 mm
Low contact surface
High contact surface
Valve grinder
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