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D14/4
ENGINE
B5
Remove these parts, then with a pair of pliers pull the
baffles from inside the silencer and soak in caustic
soda solution to dissolve the carbon. Take care not to
splash your eyes or clothing with the solution which is
very corrosive. Reassembly is in the reverse manner.
Ensure when reassembling, that the sealing ring is
correctly located before replacing the end cap.
Before starting work on the engine ensure you have
a clean bench or area in which to work, and
somewhere to place the parts as they are removed.
REMOVAL OF CYLINDER
First turn off the fuel supply and disconnect the fuel
pipe union at the float chamber. Do not attempt to pull
the pipe off the union unless it is in need of
replacement. Disconnect the air cleaner, undo the two
nuts securing the carburetter to the cylinder flange
studs and tie the carburetter out of the way.
Using a suitable "C"-spanner, release the exhaust
pipe union nut at the front of the barrel. If any
difficulty is encountered in unscrewing the nut, apply
a few drops of penetrating oil to the threaded portion
and allow to soak before attempting to unscrew it any
further. Disconnect the high-tension lead and remove
the sparking plug.
Take off the four large fixing nuts from the top of
the cylinder head and lift the head clear. Note that on
early D14 models two cylinder head gaskets of 0·025"
thickness were fitted. Later these were replaced by a
single gasket of 0·050" thickness. Always check the
gasket thickness when fitting, as two must be fitted if
of the thinner type. Before attempting to remove the
cylinder barrel, first unscrew the two petrol tank front
fixing bolts, loosen the rear fixing bolt and raise the
tank slightly to provide sufficient clearance. The petrol
tank on the Bushman models must be removed
completely. Care must be taken, when sliding the
barrel off the studs, to support the piston as it emerges
from the end of the bore, otherwise it may be damaged
as it falls clear.
Should the barrel be found difficult to remove, it may
help if the two crankcase joint screws below the
bottom fin of the barrel are slackened.
PISTON
After placing the cylinder head and barrel safely to
one side, the piston can now be examined. Unless the
piston or small end bearing is to be removed, the
piston need not be disturbed. Should it be necessary to
remove the piston, first prize out one of the gudgeon
pin circlips with a suitably pointed instrument.
FIG. B4.
Removing circlip
Before withdrawing the gudgeon pin it is advisable
to first warm the piston by wrapping it in a rag that has
been soaked in hot water. Application of this rag will
cause the aluminium alloy piston to expand more than
the steel gudgeon pin, allowing the pin to be extracted
more easily. Care must be taken not to damage the
small-end needle rollers in the connecting rod when
removing the gudgeon pin.
Scrape off any carbon which has accumulated on
the piston crown, being careful not to damage the
surface of the metal. A stick of tinsmiths solder,
flattened at one end, makes an ideal scraper tool and
will not score the piston. After removing the carbon,
wipe the piston clean with an oily rag.
Содержание D14/4 BANTAM SUPREME D14/4 BANTAM SPORTS
Страница 3: ...Page 3 ...
Страница 4: ...Page 4 ...
Страница 5: ...Page 5 ...
Страница 28: ...D14 4 ENGINE B2 FIG B1 Engine exploded ...
Страница 47: ...D14 4 CARBURETTER C2 FIG C 1 Concentric carburetter exploded ...
Страница 55: ...D14 4 FRAME AND FITTINGS D2 FIG D1 Frame dimensions ...
Страница 100: ...D14 4 ELECTRICAL SYSTEM G14 FIG G8 Wiring diagram all models except Bushman Pastoral ...
Страница 101: ...D14 4 ELECTRICAL SYSTEM G15 FIG G9 Wiring diagram Bushman Pastoral models ...
Страница 102: ...D14 4 CHAINS H1 INDEX Page Chain Measurement H2 Chain Alterations and Renewals H2 Chain and Sprocket Inspection H3 ...