Lister Petter TR1, Руководство по ремонту

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page 57
02.44 THE CRANKSHAFT
The crankshaft is a steel forging and is carried in
steel backed copper faced main bearings which are
located in the crankcase at the gear end, the flywheel
end and the central web/s of the crankcase.
End thrust is taken on steel backed copper faced
split thrust washers fitted at the gear end of the
crankcase and in the flywheel end main bearing
housing.
The main bearings are in two halves which are not
interchangeable; the top half has an oil groove and an
oil hole which must be correctly located.
An interference fit pinion is keyed onto the end of
.the crankshaft and engages with the camshaft gear.
Early crankshaft balance weights were secured
with only one retaining bolt up to the following engines:
35 00630 TS1 36 00255 TR1
35 06716 TS2 36 00073 TR2
35 05963 TS3 36 00112 TR3
After these and on all TX engines the weights were
secured by two capscrews; the later weights and
capscrews are not interchangeable with the original
items.
Crankshaft Removal
1. Remove the cylinder barrels and pistons, main
bearing housing and the sump.
2. Using the Service Tool 393175 remove the
crankshaft pinion.
Figure 2.44.1 Crankshaft Gear Removal Tool
3. Remove the pinion gear Woodruff key if necessary.
4. Remove each centre bearing locating dowel
securing screw (A).
Figure 2.44.2 Centre Bearing Dowel
Section 02
Engine Servicing and Adjustments
- crankshaft
5. Using a fuel pump securing bolt remove each centre
bearing dowel (B).
Leave the bolt in the dowel until it is refitted to
ensure the dowel is fitted the correct way round.
6. Remove the crankshaft balance weights.
7. Gently withdraw the crankshaft through the flywheel
end of the crankcase.
8. Remove the two socket screws and dismantle the
centre bearing housing/s.
9. Remove the gear end thrust washers.
Servicing the Crankshaft
a. Inspect the main bearings for scoring or wear.
If necessary, the bearings can be removed and
replaced using either Service Tool 393235 or 317-
50006 as described in "02.47 Crankshaft Main
Bearings".
b. If the connecting rod big end has been dismantled
because of failure of the bearing, the oil passages
in the crankshaft must also be examined for
obstruction and fragments of metal.
c. Check the clearance between the crankshaft and
journals, the main bearings and crankpins and also
the connecting rod bearings.
d. Examine all bearing surfaces for scoring and wear.
e. Renew the split thrust washers if they are damaged
or worn.