- 32 -
4
38
40
41
43
39
42
A
42.00
B
48.00
C
14.00 ÷ 14.018
D
14.045 ÷ 14.056
Valve stem sealing rings
- Reassembly
Lubricate the inside of the sealing ring with Molikote BR2 Plus and in-
sert them all the way onto the guides using tool 1460 – 108.
To prevent deformation of the sealing ring
1
as it is inserted onto the
valve guide
2
insert it onto tool
3
.
Lubricate valve stem with the same type of grease; insert the valves
into the guides rotating them particularly as they enter the sealing ring.
Disassembly / Reassembly
Valve guides and cylinder head housings
Intake and exhaust valve guides are both made of phosphoric cast
iron.
Components:
1
= Exhaust valve guide
2
= Intake valve guide
Valve guides with outside diameter increased by 0,5 mm are also
available; in such cases valve guide bore
C
should also be increased
by 0,5 mm.
Valve material
Intake valves A
- Material: X 45 Cr Si 9 - 3 UNI EN 10090
1
= Chromium-plated portion
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 9 - 3 UNI EN 10090
5
= Portion made of X 53 Cr Mn Ni N 21 - 9 UNI EN 10090
α
= 45°15' ÷ 45°25'
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.
Ref.
Dimensions (mm)
KD Workshop Manual_cod. ED0053029350_
1° ed
_ rev.
00
Summary of Contents for KD 626/3
Page 1: ...KD 625 3 626 3 WORKSHOP MANUAL...
Page 21: ...21 3 KD Workshop Manual_cod ED0053029350_1 ed_ rev 00...
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