Scania DC9 - Cleaning the Cooling System

36 © Scania Industrial & Marine Engines 2003-10:1
Charge air cooler (DI engine)
1.
Drain the coolant from the engine, see "Changing the coolant".
2. Detach the intake manifold from the turbo.
3. Detach the charge air cooler inlet and outlet connections for the coolant.
4. Remove the upper intake manifold.
Take care not to damage the element's water connections.
5. Remove the bolts holding the element and remove the element.
6. Clean the outside of the element. Use a paraffin-based engine cleaner.
7. Fit a new gasket to the lower part of the intake manifold.
8. Screw the element into the lower part. Tighten the bolts to 26 Nm.
9. Fit new V-ring seals to the inlet and outlet connections of the element
and fit the upper part of the intake manifold. Tighten the bolts to 50 Nm.
10. Refit the inlet and outlet connections with new O-rings.
11. Refit the delivery pipe clamps.
12. Connect the intake manifold from the turbo.
13. Fill up with coolant according to the specification on page 33.
1. Intake
manifold,
upper part
2. V-ring seal
3. Element
4. Gasket
5. Intake
manifold,
lower part
1
2
5
3
4
7. Every 4800 hours:
CLEANING THE COOLING SYSTEM
Note: If necessary, the cooling system should be cleaned more often.
External cleaning
Radiator
- Check that the radiator is not clogged on the air side and that the cooling
fins are not damaged.
- Carefully scrape the deposit off the radiator's cooling fins. If necessary,
a paraffin-based engine cleaner can be used.
- Bent fins can be straightened using a wire brush, for example, and
exercising care.
The cooling system must never
be cleaned with caustic soda.
There is a risk of damage to
aluminium parts.