Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 74 / 413

3rd
re-issue
Page 36
WSM.124
Section B (Engine)
Fig. 39.
Delapena precision honing machine
only
-ooos·
(·012 mm.) of material has to be removed
in order to allow the gudgeon pin to enter.
Honing of Piston Bosses (See Fig. 41)
The piston bosses can be honed out to take the ·003 ..
(·076 mm.) oversize gudgeon plri which should be
a finger push fit with the piston at 70 ° F. (21 ° C.)
The plug gauge, previously described, is used to
determine when the boss bores are to within -ooos•
(-012 mm.) of the required size.
Connecting Rod Alignment
After fitting and honing, or reaming a new connect­
ing rod little end bush to size, the connecting rod
alignment should be checked. The Churchill tool
for this operation is illustrated in Fig. 42. Connecting
rod alignment should also be checked when rubbing
marking on the front and rear faces of the piston is
not even around the piston skirt. Connecting rods
can be straightened in a large bench vice using
special vice Jaws.