Opening Pressure, Adjusting; Fuel Feed Pressure, Checking - Volvo Penta TAD1630G Workshop Manual

Service procedures - fuel system

Opening pressure, adjusting

Two different pressures apply:
One for a run-in injector (see Technical Data, "Opening pres-
sure"), and one which applies to a new or reconditioned in-
jector fitted with a new thrust spring ("Adjusting pressure").
The latter is higher since a certain margin must be allowed
for the normal settling of the thrust spring.
Connect a pressure gauge and slowly press down the lever
on the injection tester until the injector opens and releases
fuel. Read off the opening pressure at that instant.
If this does not agree with the pressure stipulated by the
"Specifications" the setting must be altered. This is done by
means of fitting adjusting washers.
Adjusting washer for opening pressure!
104
Spray pattern
At a pump speed of 4-6 strokes per second, the spray pat-
tern should be uniform and the fuel finely atomized.
On completion of the test, plug the pipe connections and pro-
tect the diffuser tips with caps.

Fuel feed pressure, checking

Special tools: 999 6065, 999 6066
The banjo nipple 999 6066 and pressure gauge 999 6065 are
connected to the outlet on the discharge side of the fuel filter.
Pressure is measured after the fuel has passed through the
filter insert. To do this check, first increase engine speed and
then lower it to enable the pressure to read-off at low idle.
The feed pressure must not drop below 100 kPa (14.5 psi).
Group 22