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Kohler KD425-2 Engine

The Kohler KD425-2 is a 0.85 L 2-cylinder engine rated at 3600 rpm, producing up to 1.7 kW. It powers generator sets from Kohler and SDMO, including the KD 425-2 and WELDARC 300 TDE XL C. It holds 1.8 L (0.5 gal) of oil and 4 L (1.1 gal) of coolant.

Also known as: Kohler KD425-2

0.851 L
Displacement
2
Cylinders
3600 rpm
Rated speed
1 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Oil capacity1.8 L
Coolant capacity4.0 L
Displacement0.851 L
Cylinders2
Rated speed3600 rpm
Gross power1 kW

Generator sets powered by this engine

2

Shared across brands: Kohler, SDMO

Kohler KD 425-2SDMO WELDARC 300 TDE XL C

How to read your Kohler engine serial & model number →

Common problems

3
  • Too low oil pressure
    Cause: LUBRICATION: Oil level too high, Jammed pressure relief valve, Worn oil pump, Air inside oil suction pipe, Faulty pressure gauge or switch, Clogged oil suction pipe
  • Oil and fuel dripping from exhaust
    Cause: LUBRICATION: Oil level too high, Jammed pressure relief valve, Worn oil pump, Air inside oil suction pipe, Faulty pressure gauge or switch, Clogged oil suction pipe, ELECTRIC: Battery discharged, Wrong or inefficient cable connection, Defective ignition switch, Defective starter motor
  • Black smoke
    Cause: FUEL CIRCUIT: Clogged pipes, Clogged fuel filter, Air inside fuel circuit, Clogged tank breather hole, Faulty fuel pump, Injector jammed, Jammed injection pump delivery valve, Wrong injector setting, Excessive plunger blow-by, Jammed injection pump delivery control, Wrong injection pump setting

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler KD425-2.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—250 hr
Fuel filter—250 hr
Oil filter—50 hr
Oil—50 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the oil capacity of the Kohler KD425-2?

The Kohler KD425-2 engine has an oil capacity of 1.8 liters.

What is the displacement of the Kohler KD425-2?

The Kohler KD425-2 has a displacement of 0.851 liters with 2 cylinders.

Which generators use the Kohler KD425-2 engine?

The Kohler KD425-2 powers 2 generator set(s), including Kohler KD 425-2, SDMO WELDARC 300 TDE XL C.

How often should you change the oil in the Kohler KD425-2?

The Kohler KD425-2 oil change interval is every 50 hours.

What is a common problem with the Kohler KD425-2 engine?

A commonly reported issue on generators using the Kohler KD425-2 is: Too low oil pressure. Cause: LUBRICATION: Oil level too high, Jammed pressure relief valve, Worn oil pump, Air inside oil suction pipe, Faulty pressure gauge or switch, Clogged oil suction pipe.