FUEL SYSTEM 20A
Bosch EPVE fuel injection pump with a
locking screw
To remove and fit20A-06B
Some Bosch EPVE fuel injection pumps have a
locking screw (A2) and a spacer (A3) fitted. The
purpose of the locking screw is to fasten the drive
shaft of the pump when the pump is removed from
the engine.
Caution: The drive shaft of the pump must not be
turned without the spacer in position under the
locking screw.
A new pump will be received with the locking screw
fitted and the spacer fastened to the speed control
lever by a piece of wire. The new pump is not set
to fit immediately onto the engine, but must be set
before it is fitted, see page 20A.17.
Engines which have the latest fuel injection pump
operate at a static timing very close to TDC.
When the piston is close to TDC there is a
relatively large movement of the crankshaft for only
a small movement of the piston. For this reason the
earlier method of timing, where piston movement is
measured, is not accurate enough.
When the piston is further down the cylinder, there
is a relatively small movement of the crankshaft for
a large movement of the piston. Therefore greater
accuracy is possible. For this reason the crankshaft
is set at 100° BTDC.
The timing is set on number 2 cylinder as this will
put the key in the drive shaft of the pump at the
top.
The pump is then set to a suitable angle to allow for
the crankshaft angle and the static timing angle.
If the locking screw is used, it is not necessary to
set the pump each time it is removed.
There is a timing mark on the pump flange, but not
on the timing case.
Some fuel pumps have an "O" ring (A1) fitted in a
groove in front of the pump flange. This "O" ring is
fitted instead of a joint between the pump flange
and the timing case.
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PA256
Perkins Phaser/1000 Series, April 1995 20A.13
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