TS, TR, TX engines workshop manual
49
aluminium oxide powder, failing this domestic scouring powder
may be used. Fold a strip of rag some 400 mm long by 50 mm
wide lengthwise into a 10 mm belt and wet it with the abrasive
mixture, wrap the belt once around the shaft and use it with a
reciprocating motion.
The End Cover Lip Seal
1. Remove the end cover and press out the old seal.
2. Place a new seal into the outside neck of the end cover, lip
side first, and position it squarely on the shoulder of the seal
boss; do not use any jointing compound.
3. Using the oil seal tool. 317-50065 press the seal into position
within the oil seal housing boss until it is flush with the inside
face of the boss.
In an emergency if the tool is not available a suitable plug,
preferably hard wood, can be used.
The Main Bearing Housing Lip Seal
1. Remove the bearing housing and press out the old seal.
2. Place the new seal squarely into the housing; do not use any
jointing compound.
3. Hold the oil seal tool, 317-50065, onto the outside face of the
seal and drive in the seal until the tool shoulder is against the
bearing housing.
In an emergency if the tool is not available a suitable plug,
preferably hard wood, can be used.
The Rotary Oil Seal
If a rotary seal requires changing on a very early engine it can
be replaced by the current lip type.
The three components of the rotary seal are:
a. A rotating impeller which is an interference fit on the
crankshaft and has an oil sealing thread machined on the
outside diameter.
b. A felt ring, held in place by a stationary retaining cap, which
acts as a dust seal.
c. A retaining cap which is an interference fit in the bearing
housing.
Special tools are required to assemble the seal to achieve the
correct spacing between the impeller and the inner edge of
the retaining cap and to ensure the components are square
to the crankshaft.
The impeller must not be allowed to touch the retaining cap
otherwise damage will result.
Special care must be taken when fitting the impeller not to
damage the oil sealing thread or oil leaks will occur.
The Screw Type Seal
The crankcase may be sealed at the crankshaft by a screw type
oil seal and a felt ring. The seals are marked with an arrow to
show the engine rotation for which they are intended.
The seal must be concentric with the crankshaft, with the
maximum permissible variation of gap being 0.075 mm (0.005
in).
A ring type oil thrower is fitted over the crankshaft at the
flywheel end before the main bearing housing is replaced.
1. Apply a small amount of Hylomar PL32/M to the outside
diameter of the seal
2. Before inserting the felt, the inside of the grooves should be
coated with Wellseal.
3. Lightly oil the felt sealing surface.
4. Assemble the seal to the crankshaft.
WARNING
Under no circumstances must the felt seal be distorted or
damaged in any way before or during fitting.
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