Camshaft; Central Main Bearings - Kohler LOMBARDINI 25 LD Workshop Manual

4
28
29
inlet/exhaust
30
31
- 30 -
Checks and overhaul
injection feeding pump
25 LD 330-2_425-2 Workshop Manual_cod. ED0053031690_1° ed_ rev. 00
Warning
• During grinding take care not to remove the shim adjustment
material from the main journal thrust face to avoid changing the
crankshaft end float; also ensure that the grinding wheel radii
are as specified in figure 28 so as not to create crack initiation
sections on the crankshaft.

Central main bearings

In order to facilitate assembly the central main bearings are of
different external diameters (fig.29) and are machined with a
bevelled edge to assist their insertion into the crankcase.
Check the dimensions of the shells and renew them if they are
worn or deformed.
Also check the condition of the oil passages (25LD425-2) and,
if necessary, clean them with paraffin or petrol and dry with
compressed air.
Oil seal rings
Check that the rings have not hardened around the internal
contact edge and that they show no signs of cracks or wear.

Camshaft

Check the cams and bearing journals for scoring and wear.
Measure the dimensions and compare them to the values in the
table below and shown if figures 30-31.
Camshaft dimensions fig.30.
Cam Measurement
Timing
Injection
Fuel pump
Assembly clearance between the journals and their housings
should be (fig.31):
Measurement
E
F aluminium crankcase
F cast iron crankcase
Warning
• Renew the camshaft if the cams or journals show wear in excess
of 0.1mm.
Dimensions mm
A - B 34,69 ÷
C 34,98 ÷
D 25,50 ÷
Clearance mm
0,025 ÷ 0,065
0,07 ÷ 0,105
0,04 ÷ 0,075
34,74
35,02
25,70