A.J.S. 16 Instruction Book - page 19
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(B) The metal filter located in a chamber in the front part of the crankcase and parallel
to the exhaust camshaft.
The crankcase metal filter is made integral with the non-return valve, which|i$ a
sealed unit (see illustration 7). If the valve is difficult to unscrew, do this after a
run or when the crankcase is hot.
(C) The magnetic filter in the crankcase oil sump.
NOTE—Filter B is used on twin cylinder models only.
Illustration 6
Engine Oil Circulation
17