Iveco DAILY M.Y. 2012, Body Builder Instructions

Page: 61 / 252

CHASSIS MODIFICATIONS
2-35
D
AILY
Printed 603.95.241 Base — 02/2012
Changes to the engine cooling and intake system
Changes to the engine cooling and intake system
2.10 Changes to the engine cooling system
The original conditions of proper operation must not be changed, particularly those regarding the radiator, free surface of the
radiator, pipes (dimensions and path).
In any case, if transformations are necessary (e.g.: changes to the cab) that require work on the engine cooling system, keep in mind
that:
-
the useful area for the passage ofair for radiator cooling must not be less than what is implemented for vehicles with standard
cabs;
- maximum venting of the air from the engine compartment must be guaranteed, making sure that there are no hot air pockets
or recirculation of hot air by means of guards and deflectors;
- fan performance must not be altered;
- the possible rearrangement of the water pipes must not impede the complete filling of the circuit (to be done with a continuous
flow and without any backups from the filler union) and the regular flow of water; furthermore, this rearrangement must not
alter the maximum stabilisation temperature of the water, also under the most demanding conditions of use;
- the path of the pipes must be implemented in order to prevent air pockets from forming (e.g. eliminating siphon bends or by
foreseeing suitable bleeding) that could make water circulation difficult;
- check the priming of the water pump when the engine starts and that its subsequent operation at idle speed is immediate
(perform a few accelerations if necessary) also with the circuit not pressurised. When controlling, check that the water pump
delivery pressure, with the engine at maximum no-load speed, is no less than 1 bar.
To check the operation of the cooling circuit, it is necessary to consider the supply, breather pipe and circulation of the water,
proceeding as follows:
- open the heating system supply cocks and the heater breather pipes;
- fill the circuit with the engine off, with a constant flow of 8 - 10 l/min, until it exits from the filler cap;
- once vented, close the heater breather pipes;
- start the engine and keep it idling for 5 minutes, after which the level of the water in the supply tank must not have gone below
the minimum;
- accelerate the engine gradually, checking that the average pressure in the water pump outlet pipes increases gradually, without
sudden jumps;
- keep the engine accelerated until the thermostat opens, checking the passage of air bubbles through the transparent pipes
installed between :
-
engine output and radiator;
- supply tank and water pump;
- engine breather pipe and supply tank;
- 15 minutes after the thermostat has opened, make sure that there are no more bubbles in the circuit;
- with the thermostat open and with the engine idling, make sure that the average pressure in the water pump outlet pipe is 500
mm higher than the water column.