PISTONS AND CONNECTING RODS—F.3
To Assemble the Pistons and Rings to the Con-
necting Rods
If the original pistons are being used they must be
assembled to the same connecting rods, i.e. the piston
stamped 1 on the crown must be fitted to the rod marked
1. For markings of pistons and connecting rods see
Figs. F.4 and F.6.
1.
Warm the piston in clean liquid to a temperature of
100°/120F (40/50C). It will he noted that the
cavity in the piston crown is off-set towards one
side of the piston. Therefore, place the piston on
the connecting rod with the cavity towards the side
of the rod which carries the rod and cap
identification numbers. Insert the gudgeon pin and
fit the retaining circlips ensuring that they are
seating correctly in the piston grooves.
2.
Check the fitted ring gap of the compression and
scraper rings (see Technical Data).
Note:
When checking fitted ring gap in
worn cylinders, the ring should be
checked
at
the
bottom
of
the
cylinder.
3.
Fit the piston rings to the piston in the following
order:
Slotted Scraper—
below the gudgeon pin.
Spring Expanded Oil Control—
above the gudgeon pin.
Internally Stepped Compression—
third groove.
Internally Stepped Compression—
second groove.
Chromium Plated Compression—
top groove.
Note:
When
fitting
internally
stepped
compression rings, ensure that the
"step" is towards the piston crown.
To Fit the Pistons and Connecting Rods to the
Cylinder Bore
1.
Before fitting the piston and connecting rod
assemblies to their respective cylinder bores.
Fig. F.5.
Piston Fitting with the aid of an adjustable ring clamp.
thoroughly clean and liberally coat each bore with
clean engine oil.
2.
Using a suitable ring guide (see Fig. F.5), insert the
pistons and connecting rods into the top of the
cylinder bores, ensuring that
Fig. F.6.
Showing markings on Piston
