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
α
αα
αα
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
α
αα
αα
45°15'÷45°25'
DISASSEMBLY/REASSEMBLY