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Cleaning the after cooler
6 Maintenance
Caution
The heat exchanger element in the after cooler is very vulnerable! 1

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Cleaning the after cooler
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note
Cleaning of the after cooler is not a routine maintenance job.
If the performance of the engine decreases this can be caused by a dirty heat exchanger in the after cooler. The heat exchanger must then be cleaned.
56 After cooler removal
• Stop the engine, close the sea cock and drain the system.
• Loosen the hose clamps and take the hoses (4) off the hose connection points.
• Loosen the bolt (5) so that the expansion tank (1) is released from the charge air cooler. The expansion tank does not need to be removed. • Remove the hose clamps from the charge air cooler and remove the hoses (6) off the hose connection points.
• Remove the 4 bolts and remove the charge air cooler (2) together with the drive belt cover (3).
6 Maintenance
Cleaning the after cooler
Caution
Handle with care, avoid shoves during assembly – disassembly that could damage the tube bundle and the cooling fins.
• Remove the 4 bolts and remove the heat exchanger. • Clean the pipes of the heat exchanger;use a pipe brush and fresh water to remove any growth in the pipes.
• Then rinse the heat exchanger pipes with clean water.
• Clean the fins using petrol and compressed air, maximum pressure 2 bar (28 psi) to prevent damage to the fins. Make sure there is no dirt on either of the covers to the after cooler housing. • Put the heat exchanger back in exactly the same position in the after cooler housing.
• Clean the seatings for the silicone gaskets and the O-rings.
• Put the covers back in place.
Use compressed air (2 bar, 28 psi) to check the seals for tightness to prevent leaks.
• Reconnect the cooling water hoses and fit the expansion tank back in place.