Preheater - Overhaul - MTU 12V4000M*3 series Operating Instructions Manual

8.16.11 Preheater – Overhaul
Preconditions
☑ Engine is stopped and starting disabled.
DANGER
Electric voltage supply for operation.
Danger of burns and fatal electric shock!
• Make certain that the power supply to the product is switched off before starting work. Secure
against unintentional switching on!
WARNING
Coolant is hot and under pressure.
Risk of injury and scalding!
• Let the engine cool down.
• Wear protective clothing, gloves, and goggles / safety mask.
Overhauling preheater
1. Disconnect power supply to heating element.
2. Close shut-off valve in coolant line before and after preheater.
3. Drain coolant at drain valve into a clean container.
4. Clean and flush coolant circuit.
5. Check hoses for cracks and other damage. Replace as necessary.
6. Check wiring for damage and overheating.
7. Remove heating element.
8. Clean heating element and tank.
9. Remove pump from volute (if applicable) and check for residues in impeller and lines.
10. Install heating element.
11. Connect heating element to power supply.
12. Connect hoses and open shut-off valves.
13. Check preheater for leakage and correct operation (→ Page 326).
14. Check coolant level (→ Page 313).
MS15036/00E 2018-08 | Coolant Circuit, General, High-Temperature Circuit | 327