Kohler RD 441, Service Manual

Page: 33 / 84

- 33 - Workshop Manual KD 441_cod. 1.5302.865_2 nd ed_ rev. 01.
5
51
53
1
D
L
α
2
3
4
5
L1
α
A = 34.88
52
37.8 - 0 - 0.2
Overhauls and checking
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.
Valves, characteristics
Intake valve A
Weld Joint
Chrome Plated
Chrome Plated
Base Material --> X 70 Cr Mn Ni N21.6 UNI 3992
Base Material --> X 45 Cr Si 8 UNI 3992
Base Material --> X 45 Cr Si 8 UNI 3992
Exhaust valve B - Stem and head are of two different materials
For mechanic tappets --> 96.2 - 0.2 + 0.2
For mechanic tappets --> 96.2 - 0.2 + 0.2
45° 35' ÷ 45° 65'
45° 35' ÷ 45° 65'
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.