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Home›Engines›Generac OHVI V-Twin

Generac OHVI V-Twin Engine

The Generac OHVI V-Twin is a 0.53 L 2-cylinder natural engine rated at 3000 rpm, producing up to 11 kW. It powers generator sets from Generac, including the EcoGen 6103, GUARDIAN 11, GUARDIAN 20 and GUARDIAN 22. It holds 1.6 L (0.4 gal) of oil.

Also known as: Generac OHVI V-Twin

0.53 L
Displacement
2
Cylinders
3000 rpm
Rated speed
11 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQService intervalsProceduresWiring

Engine specifications

Oil capacity1.6 L
Displacement0.53 L
Cylinders2
AspirationNatural
Rated speed3000 rpm
Gross power11 kW

Common problems

15
  • Wiring Error ALARM 2099
  • Voltage and Frequency Drop Excessively When Loads Are Applied
    Fix: TEST 14 - CHECK VOLTAGE AND FREQUENCY UNDER LOAD, BOTH LOW -> TEST 15 - CHECK FOR OVERLOAD CONDITION, NOT OVERLOADED -> GOOD -> IF RECONFIGURED TO LP GAS, VERIFY THAT PROPER PROCEDURE WAS FOLLOWED (REFER TO INSTALLATION MANUAL), GOOD -> OVERLOADED -> DISCONTINUE TESTING, REDUCE LOADS TO UNIT’S RATED CAPACITY, TEST 12 - CHECK STEPPER MOTOR CONTROL, GOOD -> BAD -> REPAIR OR REPLACE, LOOK FOR A SHORTED CONDITION IN A CONNECTED LOAD OR IN ONE OF THE LOAD CIRCUITS, GOOD -> TEST 7 - CHECK STATOR AC POWER WINDINGS, ENGINE CONDITION GOOD -> REPAIR OR REPLACE, BAD -> TEST 16 - CHECK ENGINE CONDITION, GOOD -> GO TO “PROBLEM 18 - ENGINE STARTS HARD AND RUNS ROUGH/LACKS POWER” SECTION 4.3
  • Unstable Voltage or Incorrect Output Which is Not Triggering a Shutdown
    Fix: TEST 1 - CHECK AC OUTPUT VOLTAGE, ERRATIC -> PROCEED TO PROBLEM 3
  • Undervoltage 1902
  • Stepper Overcurrent ALARM 2100
  • RPM Sensor ALARM 1501
  • Prolonged Over-Voltage Undervoltage 1900
  • Problem 22 – Battery is Dead Battery is Dead
    Fix: Test 45 – Check Battery and Cables
  • Problem 21 – No Low Speed Exercise No Low Speed Exercise
  • Problem 20 – Generator Will Not Exercise Generator Will Not Exercise
    Fix: Test 45 – Check Battery and Cables
  • Overspeed ALARM
    Cause: Prolonged (60 Hz on a 50 Hz unit, 72Hz on 60Hz unit) Over specified Hz for 3 seconds. Possible cause: Stepper motor/mixer body assembly issue.
  • Overloaded ALARM 2102
  • Overload Remove Load ALARM 2399
  • Low Oil Pressure ALARM
    Fix: Occurred while running The default Extended alarm for low oil pressure. Check oil level and pressure.
  • Instantaneous Undervoltage 1901

Compiled from service & troubleshooting documentation across every generator set that uses the Generac OHVI V-Twin.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—
Fuel filter—
Oil filterStandard—200 hr
Battery2-Line Plain Text LCD Display, 2.5 Amp Trickle Battery Charger—
Belt—
CoolantStandard1.8 liters—
Oil1.8 L—200 hr
Spark plug—

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

Service intervals

1
ItemActionHoursMonthsNotes
Oil changeChange500 hr24 moUp to 2 year/200 hour oil change interval

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

2
Installation installation

⚠ Follow local codes for installation

  1. Install within 18 inches of building if located away from doors, windows and fresh air intakes
  2. Use 1 ft flexible fuel line connector to absorb generator vibration
  3. Use composite mounting pad or concrete pad if required by local codes
Cold Weather Operation operation

⚠ Requires Cold Weather Kit for temps below 32°F

  1. Install Cold Weather Kit if temperature regularly falls below 32°F (0°C)
  2. Kit includes battery warmer and oil filter heater with built-in thermostats

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

VoltagePhaseConnectionLeadsNotes
2401-phasePre-wired transfer switch (50 Amp) or Smart Switch (200 Amp)Pre-wired 30 foot whip to connect to 5 foot pre-wired whip and external connection boxPre-wired 2 foot whip color coded to connect into existing electrical panel

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the oil capacity of the Generac OHVI V-Twin?

The Generac OHVI V-Twin engine has an oil capacity of 1.6 liters.

What is the displacement of the Generac OHVI V-Twin?

The Generac OHVI V-Twin has a displacement of 0.53 liters with 2 cylinders.

Which generators use the Generac OHVI V-Twin engine?

The Generac OHVI V-Twin powers 7 generator set(s), including Generac EcoGen 6103, Generac GUARDIAN 11, Generac GUARDIAN 20, Generac GUARDIAN 22, Generac GUARDIAN Series - 10 kW.

How often should you change the oil in the Generac OHVI V-Twin?

The Generac OHVI V-Twin oil change interval is every 200 hours.

What is a common problem with the Generac OHVI V-Twin engine?

A commonly reported issue on generators using the Generac OHVI V-Twin is: Wiring Error ALARM.