FUEL SYSTEM 20A
To adjust - Bosch pump20A-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. Normally the correct speed
will 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
section 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 2643J000CK/1/2860. In this
example, the maximum no load speed is 2860
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 the speed 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.
a
a
1
a
a
2
PA260
a
a
1
High idle reset
PA317
2643J000CK/1/2860
Mfg
Perkins Phaser/1000 Series, April 1995 20A.19
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