Technical maintenance
While you only need some enthusiasm and
the necessary time to keep your Isetta
looking smart and to clean it, the technical
maintenance requires some special know-
ledge. Therefore the following jobs should
only be carried out by yourself, if they can be
done well. It starts already with the oil change
in the engine which is to be carried out every
1000 miles (figure 30) while engine is hot.
Then proceed to unscrew the drain plug at
the bottom of crankcase (also figure30).
After the last traces of old oil have dropped
out, fill in the new up to the height of the level
mark on the dipstick (figure 5, page 10). (But
do not forget to replace and to tighten the
drain plug before refilling.) The oil capacity is
3.1 Imp. pints = 3.6 U.S. pints.
Draining should take place with the oil still
being warm. On no account use flushing oil to
flush the engine, but rather let engine some
minutes run with a pint of engine oil and then
flush through. Likewise, while the oil is still
warm, it should be drained from transmission
and chain drive. The transmission drain plug
is reached from the side opposite the engine,
at the bottom of gearbox case (figure 31
left). The transmission filler plug is located
somewhat hidden below the air filter in front
of the fender of the right-hand rear wheel
(figure 31 right). Upon having drained the
transmission oil and well tightened the drain
plug, fill in transmission oil through the filler
orifice until it can be seen in the filler hole.
The tapping-up should be done in the same
manner. Oil capacity approx. 1 Imp. pint. The
oil level of the chain case and rear axle
assembly is checked through the filler orifice
in the rear axle unit (figure 32). The oil
should reach the lower threads of the plug
hole. The drain plug is situated just beneath
the filler orifice and is marked by an arrow in
figure 32. The oil capacity of this unit is about
1/2 U.S. pint. The BMW-lsetta features
only 9 lubrication points requiring grease
supply by means of a simple grease gun.
17
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