How To Fill The Coolant Circuit; Engines Fitted With Keel Coolers - Perkins 4GM User Handbook Manual

TPD1327E

How to fill the coolant circuit

Warning!
• If coolant is to be added to the circuit during
service, allow the engine to cool before the
coolant is added. Remove the filler cap slowly
as dangerous coolant could be discharged if the
coolant is still hot and the system under pressure.
• Do not put too much coolant in the coolant circuit.
There is a relief valve in the filler cap which will
open and release hot coolant if too much coolant
is added.
Caution: If coolant is added to the circuit during
service, it must consist of the same original
mixture as used to fill the system. See "Coolant
specification" in section 5 for details of the correct
coolant to be used in the circuit.
1. Remove the filler cap (A3) of the header tank
and slowly fill the coolant system until the coolant
level is just below the pipes (A1) inside the
header tank.
Note: It is not necessary to vent air from the system
except where the engine is installed with the front
of the engine more than 10° higher than the rear.
For this type of installation a vent plug (B1) is fitted
to the top of the water outlet adaptor at the front
of the cylinder head. This plug must be removed
to eliminate air from the cylinder block when the
coolant system is filled.
2. Wait for five to ten minutes and check the coolant
level, add coolant if necessary. Fit the filler cap.
3. Start the engine. When it has reached its normal
temperature of operation, stop it and let it cool.
4. Remove the filler cap of the header tank and
add coolant until the level of the coolant (A2) is
between 25 mm (1.00 in) and 40 mm (1.50 in)
below the bottom of the pipes (A1). Fit the filler
cap.

Engines fitted with keel coolers

The coolant capacity and the method used to drain
the coolant circuit of an engine connected to a keel
cooler will vary in different applications.
Use the instructions given by the keel cooler
manufacturer to drain and renew the engine coolant
if a keel cooler is fitted.
Chapter 4
Page 17