Perkins L4 Workshop Manual - L-36 Fleet

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Crankshaft and Ma;n Bear;ngs-Cont;nued
to accommodate a rubber cored asbestos strip.
This strip consists of two sections, one for each
of the two half-housings which now compose the
seal cover. The strip itself farms a positive seal
with the rear end of the crankshaft.
When fitting the seal with the crankshaft in
position, the following procedure should be
adopted :
I. Set up a half housing in a vice with the seal
recess uppermost.
2. SettIe approximately I in. (25.4 mm) of the
strip at each end into the ends of the groove,
ensuring that each end of the strip projects
.010/.020 in. (.25/.51 mIn) beyond the half
housing joint face. Allow the middle of the
seal to bulge out of the groove during this
opcration.
3. With the finger or thumb, press the remainder
of the strip into the groove working from the
centle. Then use any convenient round bar
to further bed the strip by rolling and pressing
its inner diameter. This procedure takes
advantage of the friction between tne strip
and the groove at the ends to compact the
rope, whilst ensuring that the projections of
the end races of the rope remain as set. Fit
same to other half housing in similar manner
5. Remove all traces of the old joint from the
cylinder block rear face and fit new joint
treated with a suitable jointing compound.
6. Lightly paint the faces of the two housings
with a suitable jointing compound.
7. Spread a film of graphited grease over the
exposed inner diameter surface of the strip
8. Assemble the half housings around the rear
of the crankshaft and fasten together by the
two setscrews.
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9. Swivel the complete seal housing on the shaft
to bed in the strips and to establjsh that the
assembly turns easily on the shaft.
10. Bolt the seal housing in positjon on the block
and rcoar main hearing cap and finally tighten
with setscrews.
Replacing Crankshaft.
Ensure that all oilways are clear (See Lubricating
Diagram Fig. P.2).
Check main bearing setscrews for stretch or
damage to threads. Affected setscrews must be
scrapped.
In no case should setscrews. other than those
supplied by the engine manufacturer be used, as
they are of special heat treated high-grade steel.
Clean bearing housmgs and place top half
hearings in position.
Place crankshaft in position.
Fit lower halves of hearings to hearing caps and
place in position. Ensure that the thrust washers
on No. 3 hearing are fitted correctly.
Place tab washers in position and tighten setscrews.
For final tightening of the setscrews a torque
wrench should he used, set to the tension given
in Section B.
Lock setscrews in position by means of the tab
washers.
Fit crankshaft rear end oil seal as previously
described.
Re-assemble engine as required :lnd to tbe
instructions given fot the various operations.
It is important that new locking washers of
the correct type are fitted when setscrews have
been removed.