Perkins 900 Series Workshop Manual page 209

12
900 Series
How to fill the cooling system
To fill and vent the system Operation 12-3
Warning! Do not remove the filler cap of the cooling system while the engine is still hot and the system is under
pressure because dangerous hot coolant can be discharged.
Caution: See "Coolant specification" in Chapter 5 of the User's handbook for details of the correct coolant to
be used in the cooling system. If coolant is to be added to the system during service, it must consist of the
same original mixture as used to fill the system. The engine must be allowed to cool before coolant is added.
Note: In order to eliminate air from the system, the coolant must be added very slowly.
1 Remove carefully the filler cap of the cooling system.
2 Fill the cooling system until coolant reaches the bottom of the filler tube.
3 If a vent screw (A1) is fitted in the cylinder head, loosen the vent screw.
Note: Early cylinder heads did not have vent screws fitted
4 When coolant, free from air, flows from the vent point, tighten the vent screw in the cylinder head.
5 Eliminate air from the thermostat, if necessary:
If a brass thermostat assembly is fitted horizontally as shown in (B), loosen the vent screw (B1) on top of the
thermostat assembly until just it tightens.
6 When coolant, free from air flows from the vent point, tighten the vent screw in the thermostat assembly.
1
1
A B
C0029/1 C0008
Notes:
l It will not be necessary to eliminate air from the thermostat assembly if:
l The brass thermostat assembly is fitted vertically.
l If a plastic thermostat assembly is fitted.
7 Remove carefully, the filler cap and add coolant until the level of the coolant reaches the bottom of the filler
tube. Fit the filler cap.
8 Start the engine. Allow the engine to operate at 1750 rev/min. for two minutes. Stop the engine and allow it
to cool.
9 Repeat steps 3, 4, 5, 6 and 7.
10 Start the engine. Allow the engine to operate at a fast idle until the engine reaches its normal temperature
of operation. Stop the engine and allow it to cool.
11 Repeat steps 3, 4, 5, 6 and 7 until all the air is eliminated from the cooling system.
Workshop Manual, TPD 1345E, issue 3 199
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