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KD 702_1003_1404 Workshop Manual_cod. ED0053029340_1° ed_
Disassembly / Reassembly
Valve, specifications
Exhaust valve A
Shaft and head are made of 2 different materials.
2 Welded joint
3 Chromium-plated joint
4 Portion made of: ......... X 45 Cr Si 8 UNI 3992
5 Portion made of: ......... X 70 Cr Mn NI N 216 UNI 3992
702-1003-1404
D
30,20
Intake valve B
Material: X 45 Cr Si 8 UNI 3992
1 = Chromium-plated joint
702-1003-1404
C
34,40
Valve guides and valve guide housings
Both intake and exhasut valve guides are identical dimensionally
and are made from phosphoric gray iron with a pearlitic matrix:
Dimensions (mm):
A
B
36,4÷36,6
11,045÷11,054
Note: Valve guides are supplied in finished form, further
machining is prohibited.
Valve guides with outside diameter B increased by 0.5
mm. are available.
Valve guide insertion
Fit the guides with a punch taking account of value A in relation
to the cylinder head surface.
Dimensions (mm):
A
39,5÷40,0
7,005÷7,020
Clearance (mm):
(B-C) = 0,015÷0,050
(B- C) limite usura = 0,10
a
1
45° 30' ÷ 45' 45'
a
1
60° 30' ÷ 60' 45'
C
D
11,000÷11,018
5,80÷6,20
B
C
6,960÷6,990
6
E
9,75÷9,85
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