Triumph TR6 PI Operation Manual page 167

FUEL SYSTEM - PI
Gear pump
16. If necessary an indication of the gear pump condition
may be obtained by performing a flow test. With a
motor terminal voltage of
13·5
volt approximately
I
gallon (4·5 litres) should be delivered in 3 minutes 45
seconds at 100 Ibf/in
2
(700 kN/m
2
).
17.
Examine the interior of the gear pump. If there are
indications of wear or damage replace the gear pump
assembly.
18. Do not replace the gears or the housing individually.
The components-are mated and replacement must be
by a complete gear pump assembly only.
Shaft seal
19.
Failure of the shaft seal would be indicated by fuel
leakage from the drain pipe.
20. If necessary an indication of the seal condition may
be obtained by performing a bubble test. Connect a
short pipe to the inlet connection and a short pipe to
the outlet connection. Position the petrol pump
above an open tank of paraffin. Immerse the free end
of each pipe in the paraffin. Run the petrol pump. A
continuous flow of bubbles from the outlet pipe
indicates a defective seal.
21. If seal failure is suspected petrol may have
contaminated the motor. The unit should therefore
be dismantled as detailed above and all components
inspected before a new shaft s~al is fitted.
Spares
22. The motor and gear pump may be considered as two
units. On the majority of vehicles replacement of
either may be undertaken.
23. A few early vehicles were fitted with a gear pump
with a narrow top plate as shown. On these units the
top plates were matched to the motor base castings
during production to prevent the possibility of top
plate distortion causing gear binding. A 'narrow top
plate' gear pump should not be fitted with a
replacement motor. If a new motor is required
it
should be obtained by replacement of the complete
fuel pump.
Strainer
24. Remove the inlet connection. Withdraw the strainer
from the connection. Inspect and wash in clean
petrol.
Continued
19.45.15 P.I. Sheet 2
A Normal top plate
B Narrow top plate
Triumph TR6 Manual. Part No ..
~4S277
Iesue 1