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72
73
74
75
Workshop Manual KD500 _ cod. ED0053029390 - 1° ed_rev. 00
Insert the rocker arm casings, the partition (A, fig. 74), the head
seal and the head. Tighten the head fixing nuts evenly and
alternately (fig. 73) to the following value:
4 kgm (39,2 Nm)
NOTE: To prevent oil leaks, apread sealant (Motorsil) on
the threads of the stud bolts and washer bearing surfaces
in the rocker arm chamber before tightening the nuts.
Valve clearance
Adjust the clearance between valves and rocker arms in either a
hot or cold condition, to the following values (fig. 74):
0,20 mm
hot
0,20 mm
cold
Since the automatic decompression device opens the exhaust
valve near TDC, clearance must be adjusted during the
expansion phase, a few degrees after TDC.
Injection lead
To ensure the injection lead is accurately adjusted, it is advisable
to define the shims to insert under the pump by measuring the
dimension between the pump bearing surface and the tappet.
Proceed in the following way:
1. turn the flywheel to the compression phase
2. insert the tappet pad into the housing in the engine block,
pointing the exhaust side towards the tappet roller (see fig. 29
page 24)
3. align the dynamic lead punch mark (IP) on the flywheel with
the reference mark of the tool code 00366R0240 (fig. 75)
4. using a depth gauge (fig. 76), measure the dimension
between the injection pump bearing surface and the tappet
pad.
5. subtract 51.6 mm from the dimension measured on the
gauge; the result represents the theoretic thickness of the
seals to insert under the injection pump.
NOTE: if the flywheel or a crank component is replaced,
make sure that the punch mark on the flywheel (TDC, fig.
75) and the reference mark of the tool code 00366R0240,
match when the piston is at top dead center.
Lead values in degrees and millimeters on the flywheel:
rpm
3000
3600
The punch marks on the flywheel indicate (fig. 75):
TDC = top dead center
IP
= start of delivery
13
Engine assembly
(intake/exhaust)
(intake/exhaust)
Lead IP
18° (42,4 mm)
23° (54,2 mm)
- 37 -
- 37 -
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