The Generac OHVI V-Twin is a 0.99 L 2-cylinder natural engine rated at 3600 rpm, producing up to 30 kW. It powers generator sets from Generac, including the EcoGen 6103, GUARDIAN 11, GUARDIAN 16 and GUARDIAN 20. It holds 1.7 L (0.4 gal) of oil.
Also known as: Generac OHVI V-Twin
| Oil capacity | 1.7 L |
|---|---|
| Displacement | 0.992 L |
| Cylinders | 2 |
| Aspiration | Natural |
| Rated speed | 3600 rpm |
| Gross power | 30 kW |
Compiled from service & troubleshooting documentation across every generator set that uses the Generac OHVI V-Twin.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | Standard | — | 200 hr | ||
| Battery | 2-Line Plain Text LCD Display, 2.5 Amp Trickle Battery Charger | — | |||
| Belt | — | ||||
| Coolant | Standard | 1.8 liters | — | ||
| Oil | 1.9 Qts. | — | 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.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Exercise | Test | 168 hr | Weekly exercise | |
| Oil change | Change | 500 hr | 24 mo | Up to 2 year/200 hour oil change interval |
| Service Schedule A | Other | 200 hr | 24 mo | 200 hours or 2 years |
| engine oil | Change | 200 hr | 24 mo | 2 year/200 hour oil change interval |
| Service Schedule B | Other | 400 hr | 48 mo | 400 hours or 4 years |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap | 0.508 | mm | |
| Gap | Spark plug gap | 0.76 | mm | |
| Gap | Spark plug gap | 1.02 | mm | |
| Other | Compression ratio | 9.5:1 | ||
| Other | Cyclic cranking | 7 sec. on, 7 rest | seconds | 90 sec. maximum duration |
| Other | Engine cool-down | 1 | minute | |
| Other | Engine warm-up | 10 | seconds | |
| Other | Exerciser weekly duration | 12 | minutes | |
| Other | Rated horsepower | 30 | hp @ 3,600 rpm | |
| Other | Return to utility | 13 | seconds approx. | |
| Other | Starter lock-out | 5 | seconds after engine has stopped | |
| Other | Transfer time | 160 | millisecond | |
| Other | Utility interrupt delay | 10 | seconds approx. | |
| Pressure | Compression pressure | 150 | psi | cold engine |
| Pressure | Compression pressure | 160 | psi | cold engine |
| Pressure | Compression pressure | 165 | psi | cold engine |
| Pressure | Compression pressure | 190 | psi | cold engine |
| Pressure | Fuel inlet pressure (LP gas) | 10 to 12 | inches of water column | all load ranges |
| Pressure | Fuel inlet pressure (natural gas) | 5 to 7 | inches of water column | all load ranges |
| Pressure | Normal oil pressure | 35-40 | psi | engine running |
| Pressure | Oil pressure switch rating | 10 | psi | |
| Pressure | Oil pressure switch rating | 8 | psi | |
| Pressure | Required fuel pressure, LP gas, at generator fuel inlet | 10 to 12 | inches of water column | at all load ranges |
| Pressure | Required fuel pressure, natural gas, at generator fuel inlet | 5 to 7 | inches of water column | at all load ranges |
| Resistance | Power windings across 11 & 22 | 0.1584-0.1840 | ohms | |
| Resistance | Rotor resistance | 4.96-5.76 | ohms | |
| Resistance | Rotor resistance | 6.30-7.32 | ohms | |
| Speed | Exercise RPM | 2400 | rpm | |
| Speed | Overspeed shutdown | 72 | Hz | |
| Speed | Overspeed shutdown (instantaneous, 60 Hz) | 75 | Hz | instantaneous |
| Speed | Overspeed shutdown (prolonged, 60 Hz) | 72 | Hz | prolonged |
| Speed | Standby operating RPM | 3600 | rpm | |
| Speed | Under-frequency shutdown (50 Hz) | 40 | Hz | |
| Speed | Under-frequency shutdown (60 Hz) | 55 | Hz | |
| Torque | Ground/neutral bus bar torque (10-14 AWG) | 20 | in-lb | |
| Torque | Ground/neutral bus bar torque (4-6 AWG) | 35 | in-lb | |
| Torque | Ground/neutral bus bar torque (8 AWG) | 25 | in-lb | |
| Torque | Large ground lug torque | 120 | in-lb | |
| Torque | Large neutral lug torque | 120 | in-lb | |
| Torque | Rocker arm jam nut torque | 174 | in-lbs | |
| Torque | Rocker arm jam nut torque | 53 | in-lbs | |
| Torque | Rocker arm jam nut torque | 72 | in-lbs | |
| Torque | Valve cover fastener torque | 48 | in-lbs | |
| Torque | Valve cover fastener torque | 60 | in-lbs | |
| Torque | Valve cover fastener torque | 80 | in-lbs | |
| Valve clearance | Valve clearance (cold) | 0.05-0.1 | mm | cold |
| Voltage | Available RMS symmetrical fault current @ 250 Volts | 10000 | A | transfer switch |
| Voltage | Battery charger voltage (high temp) | 13.5 | VDC | high temperature |
| Voltage | Battery charger voltage (low temp) | 14.6 | VDC | low temperature |
| Voltage | Battery charger voltage (normal temp) | 14.1 | VDC | normal temperature |
| Voltage | Utility voltage monitor dropout | 60 | % | |
| Voltage | Utility voltage monitor pick-up | 70 | % | |
| Voltage | Voltage regulation | ±2 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | LP Gas | Required fuel pressure at generator fuel inlet 10 to 12 inches of water column at all load ranges | |||
| Fuel | Natural Gas | Required fuel pressure at generator fuel inlet 5 to 7 inches of water column at all load ranges | |||
| Fuel | Natural Gas or LP Gas | Required fuel pressure to generator fuel inlet at all load ranges - 5 to 7 inches of water column for natural gas, 10 to 12 inches of water column for LP gas | |||
| Fuel | Natural Gas or LP Vapor | Fuel pressure: NG 3.5-7 in WC (Evolution), 5-7 in WC (Nexus); LP 10-12 in WC |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 1100 | Overcrank | Engine Cranks but will not Start (5 crank attempts) | Shutdown | Problem 17 |
| 1200 | Overspeed | Prolonged over specified Hz for 3 seconds | Shutdown | Test 12 |
| 1205 | Overspeed | Instantaneous over specified Hz for 0.1 second | Shutdown | Test 12 |
| 1207 | Overspeed | Monitors zero cross timing of AVR; 150 ms of 4500 rpm or higher | Shutdown | Test 64 and Test 60 |
| 1300 | Low Oil Pressure | Occurred while running; check oil level and pressure | Shutdown | Test 61 |
| 1400 | High Temperature | Air flow impeded; check inlet/outlet for debris | Shutdown | Test 62 |
| 1501 | RPM Sensor | Twin Cylinder+Running; RPM sensor loss | Shutdown | Test 50 and Test 64 |
| 1505 | RPM Sensor | Twin Cylinder+Cranking; RPM sensor loss | Shutdown | If engine cranks, Test 64. If not crank, Problem 15. |
| 1511 | RPM Sensor | Single Cylinder+Running; RPM sensor loss | Shutdown | Test 50 and Test 64 |
| 1515 | RPM Sensor | Single Cylinder+Cranking; RPM sensor loss | Shutdown | If engine cranks, Test 64. If not crank, Problem 15. |
| 1600 | Underspeed | Unit is overloaded, slowing engine speed, fuel supply low or throttle control problem | Shutdown | Problem 3, or Test 50, or Test 12 |
| 1800 | Overvoltage | Prolonged over-voltage | Shutdown | |
| 1900 | Undervoltage | Prolonged under-voltage; below 80% for 10+ seconds | Shutdown | Preliminary Output Voltage Test |
| 1901 | Undervoltage | Instantaneous under-voltage due to sudden loss of voltage | Shutdown | Preliminary Output Voltage Test |
| 1902 | Undervoltage | Both zero crosses missing; faulty excitation winding or zero cross circuit | Shutdown | Preliminary Output Voltage Test |
| 1906 | Undervoltage | Single zero cross missing; faulty excitation winding or zero cross circuit | Shutdown | Preliminary Output Voltage Test |
| 2099 | Wiring Error | Mis-wired; customer connection low voltage and high voltage wires crossed | Shutdown | Check customer connection in generator |
| 2100 | Overload Remove Load | Overloaded - Default; one or both CTs detecting overload | Shutdown | Remove Load |
| 2299 | Undervoltage Overload | Unit was overloaded and attempted to start with large load | Shutdown | Remove Load |
| 2399 | Stepper Overcurrent | Current flow in stepper coil(s) above specification | Shutdown | Test 12 |
| 2400 | Fuse Problem | Missing or damaged 7.5 amp controller fuse | Shutdown | Test 44 |
| 2800 | Aux Shutdown | External shut down circuit is open | Shutdown | Check continuity of harness and operation of switch(es). Repair/replace as needed. |
| WARNING | Low Battery | Battery less than 12.1 Volts for 60 seconds | Warning | Test 45 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Tools: 0.008-0.012 inch thickness gauge, screwdriver
⚠ Automatic start-up. Disconnect utility power before working on unit.
Tools: 10mm wrench, 13mm wrench, 14mm wrench, 8mm wrench, 10mm Allen wrench, feeler gauge
⚠ Electrocution. Lethal voltage may be present at CTs.
Tools: clamp-on ammeter
Tools: DMM
Tools: spark tester
Tools: compression gauge, jumper wire
Tools: cylinder leak down tester, air source
⚠ Follow local codes for installation
⚠ Requires Cold Weather Kit for temps below 32°F
⚠ Do not attempt manual transfer until all voltage is disconnected.
Tools: manual transfer handle
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 240 | 1-phase | Pre-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 box | Pre-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.
The Generac OHVI V-Twin engine has an oil capacity of 1.7 liters.
The Generac OHVI V-Twin has a displacement of 0.992 liters with 2 cylinders.
The Generac OHVI V-Twin powers 7 generator set(s), including Generac EcoGen 6103, Generac GUARDIAN 11, Generac GUARDIAN 16, Generac GUARDIAN 20, Generac GUARDIAN 22.
The Generac OHVI V-Twin oil change interval is every 200 hours.
A commonly reported issue on generators using the Generac OHVI V-Twin is: Unit will not start in AUTO with utility loss. Cause: Start delay countdown. Fix: If the start up delay is greater than expected, contact servicing dealer to adjust from 2 to 1500 seconds..