25
COMPILER TECO/ATL
REG. CODE
1-5302-296
MODEL N°
50510
DATE OF ISSUE
01.89
REVISION 02
ENDORSED
DATE
17.04.2003
24 25
26
27 28
VIII
Vatves
Components:
1 Intake valve
2 Spring seat
3 Valve stem oil seal
4 Spring
5 Retainer
6 Half collets
Te remove half collets firmly press down as shown ìn the figure.
Note: Valve stem oil seal, 3 must be fitted to the intake valve only.
Valve springs
Measure free length with a gauge. Using a spring tester check that
the spring length under two different loads corresponds to the values
below:
Free length A = 52 mm
Length B compressed by a 21 Kg weight = 34.8 mm
Length C compressed by a 32 Kg weight = 25.8 mm.
Valve material
Intake valves A
Material: X 45 Cr Si 8 UNI 3992
1 Chromium-plated portion
αα
αα
α 45°15'÷45°25'
Exhaust valve B
Shaft and head are made of 2 different materials.
2 Welded portion
3 Chromium-plated portion
4 Portion made of X 45 Cr Si 8 UNI 3992
5 Portion made of X 70 Cr Mn Ni N 216 UNI 3992
αα
αα
α 45°15'÷45°25'
DISASSEMBLY/REASSEMBLY
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