7. Maintenance
4000 Hours Service Maintenance to be performed every 4000th hour of operation.
1. Cooling system If necessary, the cooling system should be cleaned more often. 1.1. External cleaning, at least every 4th year 5* 1. Clean externally the radiator fins and hoses. 2. Check that the radiator is not blocked on the air side and that the fins are not damaged. 3. Carefully scrape the deposit away from the radiator fins. If necessary, a paraffin-based engine cleaner may be used. 4. Check the fins, rubber hoses, clamps and pipes for corrosion, damage and leakages. 5. Bent fins can be carefully straightened, e.g. using a steel wire brush.
CAUTION The cooling system must not be cleaned using caustic soda. It can damage aluminium parts.
1.2
Internal cleaning, at least every 4th year 5* Removing deposits 1. If possible, run the engine until it is warm and then drain the cooling system, see changing coolant, item 1.4 2. Remove the thermostats. 3. Fill the system with clean, hot water mixed with one of the commercially available radiator cleaners based on sulphamin acid and containing dispersing agents. Follow the manufacturer's instructions (on the packaging) for mix ratios and cleaning times. 4. Run the engine for the specified time. 5. Drain the cooling system by removing a low hose or pipe. Do not use the drain cocks, the loosened deposits can clog them! 6. Refit the hose which was used as drain hose. 7 Fill the system again with hot water and run the engine for about 20 -30 minutes. 8. Drain the water from the cooling system in the usual way, use the drain cocks. 9. Refit the thermostats. 10.Fill the system with coolant as described in the specifications in item 1.3 at 2000 hours service.
WARNING When handling cleaners for the cooling system: Study the warning on the packaging. * Numbers refer to positions on the lubrication schedule, chapter 6 Operating & Maintenance Manual
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