The only parts now left are the fixed items such as studs and the crankshaft bush. This is a
press fit into the timing side and again the block should be heated in hot water or a suitable
degreasing vat, if the old bush is worn or scored and therefore to be replaced. Note that the
replacement is fitted from inside the crankcase and that there is a locating peg through the steel
face of the bush into the case.
Any stud can be removed (although this is not normally necessary) by screwing on two of the
appropriate nuts, locking them, and then unscrewing the stud with a spanner on the lower of the
two nuts. A new stud can be replaced in similar manner, this time using the spanner on the top
of the two nuts. When the replacement stud has been screwed home, simply unlock the two nuts
and take off, but care must be taken not to overstrain a stud when fitting. Note that in general a
screw thread into the crankcase is B.S.F. whereas the thread for the nuts is usually C.E.I. In
some cases, however, a Whitworth thread is used into an aluminium case, but it is always the
coarser of the two threads on a stud which goes into the case. If there is any doubt as to which
end of the stud to insert, check the threads with one of the nuts which fits that particular stud.
Another guide is that it is usually the longer length of thread which enters the case.
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