Lombardini CHD series - Valve System Checks; Valve spring - Check; Valve spring - check under load; Valve material

- 32 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
A
mm00,7÷589,6
B
mm05,53÷03,53
C
mm05,04÷03,04
aa
a
aa '54°54÷'03°54
aa
a
aa
1
'54°06÷'03°06
4
24
23
22
21
D
00,83
E
830,21÷020,21
F
850,21÷840,21
Valve spring - Check
Check the overall state of the valve springs.
Replace if damaged or if they have lost their original elasticity.
First of all, use a gauge to check that the free length matches the
measurements given below.
A = 52 mm
Dimensions
Ref.
EXHAUST VALVE INTAKE VALVE
Disassembly / Reassembly
Valve guides and cylinder head
Intake and exhaust valve guides are both made of gray cast iron
with pearlitic and phosphoric matirx.
Valve guides with outside diameter F increased by 0.5 mm
are available; in such case valve guide bore E should also be
increased by 0.5.
Dimensions (mm)
Ref.
Valve material
Valve spring - check under load
Verify (with a dynamometer) that the length under load matches
the nominal length.
Ifitisshorterthanthatquotedingure22, replace the spring.