Figure 14-24. Variable speed droop adjustment
14-48. Fuel Injection Pump, Bench Test.
a. The following bench test procedure is based on
the following conditions.
(1) Injection lines.
Two standard line sizes;
1/16 inch I. D, by 20 riches and 3/32 inch I.D. by 20
(2) Fuel. The readings are based on fuel with a
viscosity of 34-36 SSU at 100° F.
(3) Fuel Temperature. 110-115° F.
(4) Nozzles: part number 12SD12 adjusted to an
opening pressure of 2500 psi (175 ATS).
b. Use diesel injector pump test stand and pro-
ceed as follows
(1) Mount the pump securely with a suitable
adapter. A drive adapter, usually with a ball bear-
ing, supports the shaft.
This pump must be tested
using an intermediate support bearing. Install high
pressure injection lines using new gaskets. Leave
fuel line connector screws at pump and injection
line nuts at nozzles loose. Install inlet and return
lines and transfer pump pressure gauge. Use a re-
striction fitting on the return line. The pump comes
with one installed.
(2) Set counter and tachometer switches to
Remember that the test stand
tachometer registers pump speed.