Triumph TR6 PI Operation Manual page 151

Metering Distributor Assembly
The metering distributor assembly is mounted
on the engine and is driven by a pinion shaft gear off
the ignition distributor driving gear. The assembly
comprises two main units namely the metering unit
and the control unit.
A Metering Unit
B Control Unit
Metering Unit
The metering unit consists of an outer casing
with one inlet and six outlet ports. Located and
seated inside the casing so that it cannot revolve or
move axially is a sleeve with six inlet and six outlet
ports arranged in spaced pairs 60
0
apart, inlet and
outlet alternating. A space between the body and the
sleeve forms a reservoir for pressurised fuel. The six
outlet ports are coincident with the outlet ports in
the outer casing and sealed unions con taining
non-return valves connect the sleeve and body ports
to injector delivering pipes. A rotor which has two
radial ports to a central bore and is driven by the
pinion shaft gear, revolves within the sleeve. The
central bore of the rotor contains a shuttle with a
fixed stop at one end and a variable stop at the other.
When the engine is started and the rotor turns
within the sleeve, the rotor port at the variable stop
end becomes coincident with the port in the sleeve
leading to the fuel reservoir in the outer casing. Fuel
at high pressure enters the rotor bore and drives the
shuttle to the fixed stop end of the rotor. This
movement of the shuttle displaces fuel in the rotor
bore through the ports in the rotor and sleeve and out
through the non-return valve in the union serving
number one cylinder.
A further 120
0
rotation of the rotor causes the
rotor ports at the fixed stop end to align with the
sleeve port leading to the pressurised fuel reservoir.
Fuel now enters at the fixed stop end of the rotor
and drives the shuttle back towards the variable stop
end. The displaced fuel from the rotor bore ports
passes to number five cylinder via the sleeve port and
non-return valve union.
The shuttle continually moves between the two
stops displacing an accurate amount of fuel to each
cylinder in turn. The quantity of fuel delivered at
each injection is dependent upon the distance the
shuttle travels which is determined by the control
unit.
Triumph TR6 Manual. Part No. 545277 Issue 1
FUEL SYSTEM
PI
I. Fixed stop
2. Rotor drive
3. Outlet to No. I injector
4. Outlet to NO.2 injector
5. Variable control stop
6. Rotor
7. Sleeve
8. Body
9. Fuel inlet from pump
10. Shuttle
9 1 2
19.35.00 P.1.
Sh~l't
3