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Page IV
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All threads used on the L4 Engine, except on proprietary
equipment and the crankshaft are Unified Series, and American
Pipe Series. The crankshaft and starting dog nut are threaded
1
ff
American National Fine, 14 T.P .1.
Unified threads are not interchangeable with B.S.F. and
althoogh B.S. W. have the same nomber of threads per inch
as Unified Coarse Series, interchanging is not recommended,
doe to a difference in the thread form.
The engine number is stamped on the top rear, light hand
side of the cylinder block, as shown in the diagram below.
Tbis number should be quoted when requesting information
or ordering Palts.
This publication ~ produced by the Technical Publications Department
of the Perkins Senice Division and every en~vour
is made to ensure
that the information contained in this mannal ~ correct at the date of
pubti:cation but doe to continuo us developments. the manufacturers
reserve the right to make alterations without notice.
Diagram showing position of Engine No. 6012625
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