Cylinder Head
3---2
43--- 4
5. Measure the clearance between the valve stem and the
valve guide with a dial gauge. Lift the valve so that the valve
head is
15 mm
from the face of the cylinder head, and
measure the clearance. It must not be greater than
0,30 mm
for the inlet valves and
0,35 mm
for the exhaust valves. In
order to establish the valve guide wear, a new valve should be
used when measuring.
D. Changing valve guides
9101 65800
43--- 5
1. Press or knock out the old guides using drift 9101 65800.
Clean the valve guide locations.
2. Lubricate the outside of the new guides and fit them using
drift 9101 65900, which ensures the correct fitting height (
21
mm
over the spring face).
21 mm
9101 65900
43--- 6
3. The guides are the same for the inlet and exhaust valves.
Ensure that the steepest chamfer on the guide, faces the
valve head. Check that the valves do not bind in the guides.
E. Machining valve seat
43--- 7
9101 66100
Machine the damaged valve seat with milling cutter. If the
width of the seat exceeds
2,3 mm
in exhaust and
3,7 mm
in
intake, it should be reduced primarily at the outer edge.
The valve seat angle is
45
˚
+20’
for exhaust valve and
35
˚
+20’
for inlet valve.
Содержание 645 Series
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