CAT Engine Oil Leak

Visible oil leak under or around the generator set

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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 oil filter, Loose or damaged oil drain plug, Valve cover gasket leak, Front or rear crankshaft seal leak

How to Fix / Troubleshooting

Safety: Allow the engine to cool. Disable automatic start and keep the area clean to avoid slips.

  • Locate leak source: Clean the engine exterior with degreaser and run briefly to see where fresh oil appears.
  • Check oil filter and drain plug: Tighten the oil filter by hand (usually 3/4 turn after gasket contact) and snug the drain plug to spec. Do not overtighten.
  • Inspect gaskets: Look around the valve cover and oil pan for seepage. Replace gaskets if leaking.
  • Monitor oil level: Keep oil at the correct level and monitor for rapid loss, which indicates a more serious leak.

Leaks from crankshaft seals or internal engine joints typically require engine disassembly and should be handled by a CAT technician.

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Repair Difficulty

Medium 3/5

Required Part

Engine Oil Filter
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