Caterpillar OHV V-Twin Engine
The Caterpillar OHV V-Twin is a 420 L ohv engine. It powers generator sets from Caterpillar, including the RP12000 E, RP6500 E and RP7500 E.
Also known as: CAT OHV V-Twin
Engine specifications
| Displacement | 420.0 L |
|---|
| Aspiration | OHV |
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Common problems
5- Engine Will Not Start
Cause: Generator switch in the off “ 0 ” position Choke knob in the wrong position No fuel Bad or contaminated fuel Not enough oil in the engine Dirty air filter No fuel at the carburetor Engine flooded No spark (for electric start)
Fix: Turn the generator switch to the correct position. Place the choke knob in the correct position. Fill the fuel tank. Check the fuel. Check the oil level. If low, add the recommended oil. Clean the air filter. Make sure the fuel switch is in the on " I " position. Wait 5 minutes. Replace the spark plug. For electric start, start the engine using the recoil starter. If the generator starts, check the battery. If the battery is providing less than 12.4 volts, replace the battery. - Engine Shuts Down
Cause: Out of fuel Not enough oil in the engine Dirty air filter Generator overloaded
Fix: Check the fuel. Fill the tank if necessary. Check the oil level. If low, add the recommended oil. Clean the air filter. Unplug some of the devices. - Engine Runs, But Generator Does Not Provide Power
Cause: Circuit breaker is open Bad connection Defective power cord Defective device plugged in
Fix: Close the circuit breaker. Stop the engine and check the connections. Replace the cord. Unplug defective device. - Engine Runs Rough (with load)
Cause: Dirty air filter Generator overloaded
Fix: Stop the engine and check the air filter. Clean if needed. Start the engine / check if it runs rough. Unplug some of the devices. - Engine Runs Rough (no load)
Cause: Dirty air filter
Fix: Stop the engine and check the air filter. Clean if needed. Start the engine / check if it runs rough
Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar OHV V-Twin.
Service intervals
1| Item | Action | Hours | Months | Notes |
|---|
| Engine Oil Level | Check | | | First service — Before each start |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
1| Type | Item | Value | Unit | Condition |
|---|
| Gap | Spark Plug Gap | 0.7 - 0.8 | mm | |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|
| Engine oil | SAE 30 or 10W-30 | | | 1.6 L | Pressurized lubrication system |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
3Starting the Engine - Electric Start operation
- Turn fuel valve to ON position
- For cold engine, pull choke knob out
- Turn generator switch to START position
- Release switch when engine starts
- Once engine starts, slowly push choke knob in
Starting the Engine - Recoil Start operation
- Turn fuel valve to ON position
- For cold engine, pull choke knob out
- Turn generator switch to ON position
- Slowly pull starter handle until resistance felt
- Quickly pull the handle with full force
- Once engine starts, slowly push choke knob in
Stopping the Engine operation
- Turn generator switch to OFF position
- Turn fuel valve to OFF position
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 displacement of the Caterpillar OHV V-Twin?
The Caterpillar OHV V-Twin has a displacement of 420.0 liters.
Which generators use the Caterpillar OHV V-Twin engine?
The Caterpillar OHV V-Twin powers 3 generator set(s), including Caterpillar RP12000 E, Caterpillar RP6500 E, Caterpillar RP7500 E.
What is a common problem with the Caterpillar OHV V-Twin engine?
A commonly reported issue on generators using the Caterpillar OHV V-Twin is: Engine Will Not Start. Cause: Generator switch in the off “ 0 ” position Choke knob in the wrong position No fuel Bad or contaminated fuel Not enough oil in the engine Dirty air filter No fuel at the carburetor Engine flooded No spark (for electric start). Fix: Turn the generator switch to the correct position. Place the choke knob in the correct position. Fill the fuel tank. Check the fuel. Check the oil level. If low, add the recommended oil. Clean the air filter. Make sure the fuel switch is in the on " I " position. Wait 5 minutes. Replace the spark plug. For electric start, start the engine using the recoil starter. If the generator starts, check the battery. If the battery is providing less than 12.4 volts, replace the battery..