57
Model Code Page
21. Engine
1. 4. 1997
6000--8750 213 1
1. 9. 1992
Crank mechanism (Op. no
213)
1. Crankshaft
A. Removing crankshaft
1. Split the tractor at the clutch, remove the clutch assembly
(and possible turbine clutch) and the flywheel. Remove the
engine (see also page 219/1).
2. Disconnect t he balancing unit lubricating oil pipe from the
cylinder block and unscrew the balancing unit fixing bolts .
Remove the balancing unit and the lubricating oil pipe (only
420---engines).
3. Unscrew the lubricating oil pump pressure pipe fixing
screws from the cylinder block. Remove the oil pump and the
suction and pressure pipes.
4. Remove the flywheel housing.
5. Detach the belt pulley/hub from the crankshaft front end
(see instr. timing gears).
6. Remove the connecting rod bearing caps and push the
connec ting rods out of the way of the c rankshaft.
7. Remove the main bearing caps and lift out the crankshaft.
B. Checking crankshaft
1. Clean the crankshaft. Do not forget the oilways.
2. Measurethe journal wear in several points.Out---of---round,
taper or other wear must not exceed 0,03 mm.
3. Refit the bearing caps with new bearing shells and tighten
them to the correct torque. Measure the I.D. with a dial gauge
which has been zeroed to the dimensions obtained in point 2.
With this method the indicator shows the actual bearing clear-
ance. Measure in several points in case the worn bearing
housing is not round.
4. If the bearing clearance exceeds 0,18 mm for main bear-
ings or 0,14 mm for connecting rod big---end bearings with
new bearing shells, the bearing journals on the crankshaft
should be ground. Refer to the specifications for the relevant
correct undersize and the corresponding bearings. Ensure
that the radii are not changed when grinding.
Note! Main bearings are available,which are 1,0 mm oversize
(outer diameter) and 0,5 mm unders i ze (inner diameter). The
cylinder block must then be machined to a dimension of
92,000---92,025 mm. The crankshaft must be machined to a
dimension of 84,485---84,520 mm. The bearing shell with a
hole and an oil groove must be fitted to the cylinder block and
the other shell to the bearing cap.
C. Changing crankshaft gears
9052 48800
1. Apply pullerfor the crankshaft gears and pull off both gears.
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