Cold Start Advance Unit - Perkins New 1000 Series Workshop Manual

11
New 1000 Series

Cold start advance unit

Some Lucas/Delphi, Bosch and Stanadyne rotary fuel injection pumps have a cold start advance unit that holds
the timing of the pump in an advanced position when the engine is cold.
Caution: It is important that the electrical connections to the sender unit are connected correctly. Failure of
the starting aid to operate correctly could result in damage to the engine as the timing will be fully advanced
for normal operation.
The sender unit, for engines fitted with belt driven coolant pumps, is on the top of the thermostat housing. The
sender unit, for engines fitted with gear driven coolant pumps, is on the rear of the timing case on the left side
of the engine.
As the engine warms, the sender unit energises to retard the pump timing to the correct timing for normal
operation of the Lucas/Delphi and Bosch fuel injection pumps. The sender unit for the Stanadyne cold start
unit de-energises to retard the pump timing to the correct timing for normal operation.
Note: The wiring diagrams on the following page show the sender unit (component 3) position when the
engine is cold.
To ensure that the engine conforms to the emissions legislation, it is important that the electrical connections
of the engine cold start advance unit are fitted correctly before the engine is operated.
Caution: Damage to the engine will occur if the engine is load tested at more than 80% of full load with the
cold start device disconnected.
Continued
212 Workshop Manual, TPD 1350E, Issue 4
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