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t4 MARINE ENGINES-W.2
A 12 or 24-volt insulating return system may be
fitted as optional extra. The dynamo is lo~ated on
the starboard side of the engine. The starter motor
is flange mounted on the port side cf the engine.
the starter pinion engaging with the starter ring c>n
the flywheel at the aft end of the engine.
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Fig.WI.
1 and 2. From the 1/8" Diameter Pilot holes in t evelloca-
ting Ring. drill two holes 17/64# Diameter to a depth of
3/8" in bevel wh~1 casiCW and tap 5/16" B.S.F. to a depth
ot 1/4" in bevel wheel cAing to accommodate two Allen
Screws 5/16" B.S.F. x 1/2" in length. These two holes
must not be drilled and tapped until the bevel locating
ring has been locked in position with locking plates and
slots peened over.
3. Bevel locating ring locking slots peened over locking
plates.
Water Circulation.
The engine may he so arranged as ro accom-
modare any one of the foIIowing three types of
cooling system.
Remove eight securing setscrews and
washers.
Replacing Input Shaft and Gearbox.
First ensure that the tlywheel housing and tly-
wheel are correctly aligned (See Section U).
Using the eight setscrews complete with washers.
fit the input shaft to the engine tlywheel and
tighten evenly.
Secure the base of a clock gauge securely to the
ftywheel housing and adjust the clock so as to set
the needle on the outside diameter of the input
shaft. and check that the shaft is central. The
limit in respect of inpu1 shaft concentricity is set
.
at
.003 in. (.076 mm) total indicator reading.
With satisfactory alignment attained. the secur-
ing setscrews should then be wired together.
The gearbox may then be eased into position
on the input shaft. With the mechanical gearbox.
care should be taken to ensure that tbe key on the
input shaft is in line with the keyway in the gear-
box hearing. Secure the gearbox to the tlywheel
hou.~ing by means of the 12 setscrews and was hers
and refit propellor shaft.
Locating Ring-Mechanical Gearbox.
A modified bevel locating ring locking plate has
been incorporated in mechanical gearboxes for
fitment to L4 marine engines.
This latest locking plate is trucker in section
than the original type and of different specification
material and bas been incorporated to eliminate
any possibility of bending or failure of the plate
in service.
With the advent of tbis modification, the locking
medium whereby this plate is secured, was altered
so that now two holes -fr; in. B.S.F. by -f6. in.
(14.29 mm) deep are drilled and tapped in the
locating ring and pinion cage to accommodate two
Allen grubscrews -fr; in. B.S.F. by tin. (12.70 mm)
long.
It should be noted that af ter assembly, the edges
of the slots accommodating the bevel ring locating
plates should be peened over as also should the
drillings into wbich are fitted the grubscrews.
Details of these modifications are illustrated in
Figure W.l illustration and it is recommended that
all gears sent in for service be similarly modified
when necessary.
Electrical Equipment.
With the L4 Marine engine. a 12-volt earth
return system is employed as standard equipment.
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