DESCRIPTION AND FUNCTION OF METERING DISTRIBUTOR
A metering distributor is shown in Figure 9. The rotor and
sleeve assembly is made of steel and is supported inside the aluminum body by
two ‘0’ type seals. The body has an inlet and six outlets. Fuel in the
supply line is maintained at a pressure of 100-110 lbf/in2 (689.50-758.50 kN/m2)
by the action of the pump and the relief valve. Pressurized fuel enters the body
through the nylon gauge strainer in the inlet. The space
between the sleeve, the aluminum body and the two ‘0’ rings is filled with
fuel at pressure 100-110 lbf/in2 (689.50-758.50 kN/m2). As the rotor turns, one
of the inlet ports in the sleeve coincides with an inlet port in the rotor. Pressurized
fuel then enters the center bore in the rotor.
When the rotor turns through a further 60
degrees, another inlet port in the sleeve coincides with an inlet
port in the rotor. Pressurized fuel again enters the center bore of the rotor,
driving the shuttle towards the other stop. An identical amount of fuel is then
delivered to the second cylinder by means of the appropriate outlet and its
Every time the rotor completes a revolution, accurately
metered quantities of fuel are delivered to each cylinder in turn, by means of
the appropriate outlet. There are six outlets (on the Triumph ‘P.I.’ systems),
one for each cylinder. All the outlets incorporate rubber ‘0’ type seals, to
seal the pressurized fuel in the space between the sleeve and the rotor.
The six outlet unions locate the sleeve in the aluminum body. Leakage fuel is
collected in a chamber at the drive end, and is conveyed back to the fuel tank.
A small quantity of the leakage fuel is used to lubricate the rubbing surface of
the cam follower. It also lubricates the Oldham type coupling, which drives the
rotor at half engine-speed.