20C FUEL SYSTEM
To adjust -
Lucas DPA and DPS pumps 20C-07
1 Operate the engine until it reaches its normal
temperature of operation and check the idle speed.
If necessary, adjustment can be made by the inner
adjustment screw (A1). Release the lock nut and
rotate the adjustment screw clockwise to increase
the speed or counter-clockwise to decrease the
speed. When the speed is correct, tighten the lock
nut. The setting of the idle speed can change for
different applications. The correct speed will
normally be given in the manufacturer's handbook
for the application. If it is not given, apply to your
nearest Perkins distributor or to Technical Services
Department, Perkins International Ltd,
Peterborough, England.
Caution: The setting for the maximum no load
speed can change for different applications. Always
check the fuel injection pump data plate (B) fitted to
a specific engine, before any adjustment to the
maximum no load speed.
2 With the engine at its normal temperature of
operation, check the maximum no load speed. The
maximum no load speed is indicated by the last part
of the setting code for the fuel injection pump. The
setting code can be found on the data plate (B1) on
the side of the fuel pump. A typical setting code is
2643C618DM/1/2420. In this example, the
maximum no load speed is 2420 rev/min. If
necessary, this speed can be adjusted by the outer
adjustment screw (A2). Release the lock nut and
rotate the adjustment screw counter-clockwise to
increase, or clockwise to decrease, the speed.
When the speed is correct, tighten the lock nut and
seal the screw. The person who fits the pump must
ensure that the adjustment screw is suitably sealed
against interference after it has been set initially.
The adjustment screw on original fuel pumps is set
and sealed by the manufacturer. The setting must
not be changed as this could affect the engine
warranty.
PA259
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334F993 626
PA316
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Ser 29144 BNG
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2643C618DM/1/24200
1
20C.04 Perkins Phaser/1000 Series, April 1995
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