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Workshop Manual KD 441_cod. 1.5302.865_2
Cylinder head
Valves - Disassembly
Components:
1 Valve stem
2 Oil seal
3 Spring washer/set
4 Spring
5 Cap
6 Half collets
Note: To remove half collets place a suitable plate under the valve
head and press down firmly as indicated in the figure.
Valve, springs
Measure the free length with a caliper.
Note: Replace the spring if the free length A is 1 mm less than spe-
cified.
Valves, characteristics
Intake valve A
Base Material --> X 45 Cr Si 8 UNI 3992
1
D
L
α
Exhaust valve B - Stem and head are of two different materials
2
3
4
5
Base Material --> X 70 Cr Mn Ni N21.6 UNI 3992
L1
α
nd
ed_ rev. 01.
Overhauls and checking
A = 34.88
Chrome Plated
37.8 - 0 - 0.2
For mechanic tappets --> 96.2 - 0.2 + 0.2
45° 35' ÷ 45° 65'
Weld Joint
Chrome Plated
Base Material --> X 45 Cr Si 8 UNI 3992
For mechanic tappets --> 96.2 - 0.2 + 0.2
45° 35' ÷ 45° 65'
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