MTU Onsite Energy
External Coolant Leak
Coolant puddle under generator set, but no coolant level alarm yet
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose hose clamp, Cracked coolant hose, Leaking radiator core, Faulty water pump seal
How to Fix / Troubleshooting
Safety first: Allow the engine to cool before touching coolant components. Coolant can be hot and under pressure.
- Locate leak: Trace coolant stains from the puddle back to hoses, clamps, radiator, or pump.
- Tighten clamps: Gently tighten any loose hose clamps and recheck for seepage.
- Replace damaged hoses: Install new coolant hoses where cracks or bulges are found, using MTU-specified hose types.
- Radiator and pump: Inspect the radiator core for wet spots and the water pump weep hole for leakage. Significant leaks require component replacement.
- Refill and bleed: Refill the system with the correct coolant mix and bleed air per MTU procedures. Monitor level closely on the next run.
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Repair Difficulty
Medium
3/5
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