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Nissan H15/H20-11/H25 Engine

The Nissan H15/H20-11/H25 is an engine. It powers generator sets from Nissan Motor, including the H15, H20 and H25. It holds 3.8 L (1.0 gal) of oil.

Also known as: NISSAN H15/H20-11/H25

3.8 L
Oil capacity
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Oil capacity3.8 L

Generator sets powered by this engine

3
Nissan Motor H15Nissan Motor H20Nissan Motor H25

Common problems

7
  • Warning light remains 'on' while engine running
    Cause: Oil pressure switch unserviceable.
    Fix: Replace.
  • Slow SLOW
    Fix: Charge battery.
  • Oil leakage
    Cause: Damaged or cracked pump body cover.
    Fix: Replace.
  • Noise
    Cause: Excessive backlash in pump rotors.
    Fix: Replace.
  • ENGINE WILL CRANK NORMALLY BUT WILL NOT START
    Cause: Ignition system trouble.
    Fix: Check spark plug first by following procedure. Disconnect high tension cable from one spark plug and hold it about 10 mm (0.39 in) from the engine metal part and crank the engine. If good spark occurs: a. Check spark plug. b. Check ignition timing. c. Check fuel system. d. Check cylinder compression. If no spark occurs: Check the current flow in primary circuit. Very high current: Inspect for shorted primary circuit.
  • Decreased oil pressure
    Cause: Lack of oil in engine oil pan.
    Fix: Correct.
  • CANNOT CRANK
    Cause: Improper grade oil.
    Fix: Replace with proper grade oil.

Compiled from service & troubleshooting documentation across every generator set that uses the Nissan H15/H20-11/H25.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterClean or replace air cleaning filter—
Oil filterChange engine oil and oil filter—
OilChange engine oil and oil filter3.8 l—

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 Nissan H15/H20-11/H25?

The Nissan H15/H20-11/H25 engine has an oil capacity of 3.8 liters.

Which generators use the Nissan H15/H20-11/H25 engine?

The Nissan H15/H20-11/H25 powers 3 generator set(s), including Nissan Motor H15, Nissan Motor H20, Nissan Motor H25.

What is a common problem with the Nissan H15/H20-11/H25 engine?

A commonly reported issue on generators using the Nissan H15/H20-11/H25 is: Warning light remains 'on' while engine running. Cause: Oil pressure switch unserviceable.. Fix: Replace..