Cummins/Onan P248 Generator Set

Tools: 1/8 inch drill bit, wrench

1. Shut off engine, remove air cleaner outer cover and filter element.
2. Loosen choke rod swivel clamp screw.
3. Lock throttle control lever with pin (1/8 inch drill bit) so pin acts as stop for choke lever.
4. Push choke rod towards carburetor to fully open choke.
5. Rotate choke lever towards carburetor until it bears against pin stop, tighten swivel clamp screw.
6. Remove lock pin and check choke linkage operation. Replace damaged components.
7. Reassemble air cleaner.
8. Adjust throttle and choke control cables.

Tools: 1/8 inch drill bit, wrench

1. For single-cable: shut off engine, loosen throttle cable clamp.
2. Lock throttle lever with pin (1/8 inch drill bit).
3. Push speed control lever to high speed position.
4. Hook cable wire into throttle lever, pull out slack, tighten clamp. Remove lock pin.
5. For two-cable: repeat steps 1-3, then push choke knob to full-open.
6. Hook choke cable wire into choke lever, push choke rod towards carburetor, pull out slack, tighten clamp.

⚠ Adjusting the engine speed to a value above that specified by the equipment manufacturer could cause the equipment to operate at speeds in violation of Federal and State Standards for Safety for the equipment.

⚠ Moving parts can cause severe personal injury or death. Take care when measuring engine speed with a tachometer and follow the meter instructions. You must be a qualified mechanic.

Tools: tachometer

1. Normally no need to adjust engine speed. Instructions are for equipment manufacturer. Attempt only by qualified mechanic using accurate tachometer.
2. Set low-idle and high-idle speeds to values specified in equipment Operator's Manual. If absent, adjust low-idle to 1,100 RPM and high-idle to 3,400 RPM.
3. Start engine, observing all equipment manufacturer's instructions and precautions.
4. If throttle cable already connected, loosen clamp at engine and back out low-idle speed stop screw so speed stop screw on carburetor touches its stop. Adjust engine speed to 1,000 RPM with carburetor
5. Turn low-idle speed stop screw to obtain specified low-idle speed.
6. Move engine throttle link up against its stop tang and hold it there while bending tang as necessary to obtain specified high-idle speed.
7. Hook engine throttle link with throttle cable, pull slack out of throttle cable and tighten clamp. Check for full, smooth movement of engine throttle link between its two stop positions when equipment

⚠ Adjusting engine speed above equipment manufacturer spec could cause violation of safety standards.

⚠ Moving parts can cause severe personal injury or death.

Tools: tachometer, 1/8 inch drill bit, wrench

1. Remove outer cover of air cleaner and set up tachometer.
2. Start engine.
3. Lock throttle control lever with pin (1/8 inch drill bit) in control plate.
4. Loosen choke rod swivel clamp screw and push choke rod towards carburetor to fully open choke.
5. Adjust high-idle speed by rotating engine control plate. Loosen pivot bolt 1/8 turn and set bolt 1/4 turn. Retighten.
6. Adjust low-idle speed by turning idle speed screw. Remove lock pin and move throttle to lowest position.
7. Shut off engine and readjust choke.

1. Step 01: Check fuel supply, spark plugs
2. Step 02: Perform checks in Step 01; check battery, ignition coil, ignition module
3. Step 03: Perform checks in Step 01 and 02; check fuel filter, fuel pump, carburetor; perform engine leak down test

1. Step 01: Check fuel supply, carburetor choke, spark plugs
2. Step 02: Perform checks in Step 01; check air cleaner element, fuel filter, intake manifold gaskets, fuel pump, carburetor, ignition coil, ignition module; perform engine leak down test

1. Step 01: Check governor, throttle cable, carburetor choke, fuel filter, air cleaner element, fuel pump, carburetor
2. Step 02: Perform checks in Step 01; check intake manifold gaskets; perform engine leak down test

1. Refer to Table 2 for scheduled foam wrapper maintenance and air cleaner element replacement. See Figure 4.
2. For foam wrapper only: do not remove inner air cleaner cover. Remove and wash foam wrapper in water and detergent.
3. Squeeze foam wrapper dry like a sponge. Rinse with clean water and allow to dry.
4. Coat wrapper evenly with one tablespoon (14 grams) of SAE 30 engine oil. Knead oil into wrapper and wring out excess oil.
5. Install foam wrapper over paper air cleaner element by stretching it over inner cover. Completely cover all exposed paper pleats.
6. Replace foam wrapper when it becomes torn or stretched.
7. For element replacement: pull choke knob to full-choke position to close choke plate. Remove outer cover and wipe away loose dust and debris.
8. Remove inner air cleaner mounting nut and cover.
9. Remove air filter paper element and foam wrapper from engine. Wipe off dust and debris from air cleaner base.
10. Install new paper element and secure with inner cover and mounting nut. Reinstall foam wrapper and outer cover. Reconnect crankcase breather tube.

⚠ Hot exhaust parts can cause severe burns. Allow the engine time to cool before servicing the exhaust system.

⚠ A clogged flywheel air inlet screen or dirty cooling fins can cause overheating and engine damage. Keep cooling fins and air inlet screen clean.

⚠ Crankcase pressure can blow hot engine oil out the fill tube causing severe burns. Always stop the engine before removing the oil fill cap.

1. Inspect fuel lines and fittings for leaks. Repair leaks immediately.
2. Look and listen for exhaust system leaks while engine is running. Look for cracks and severe rusting in muffler and tailpipe. Have all leaks repaired before continuing operation.
3. Check engine for dirt and debris and clean flywheel air inlet screen and cylinder cooling fins as necessary.
4. Check engine oil level. Equipment must be parked on level surface and engine stopped. Wait a minute for oil to settle. Turn oil fill cap counterclockwise and lift from fill tube. Wipe dipstick clean a
5. If oil level is low, add API Class SG or SH oil having SAE viscosity grade appropriate for expected temperatures, as indicated by Table 1. Do not fill above Full mark.
6. Reinstall dipstick and cap after checking or adding oil, turning clockwise until secure.

1. Operate equipment at about half power for first 1-1/2 hours, occasionally full power briefly. Avoid prolonged low-speed, low-power operation.
2. Use proper engine oil for ambient temperatures.
3. Check oil level twice a day or after every 4 hours during first 24 hours.
4. Change oil and oil filter after first 24 hours and have valves readjusted by qualified mechanic.

⚠ State and federal agencies have determined that contact with used engine oil can cause cancer or reproductive toxicity. Take care to limit skin contact and breathing of vapors. Use rubber gloves and wash exposed skin.

⚠ Accidental starting of the engine can result in severe personal injury or death. Always disconnect the spark plug and the battery (negative [–] cable) before changing oil.

⚠ Crankcase pressure can blow hot engine oil out the fill opening causing severe burns. Always stop the genset before removing the oil fill cap.

Tools: pan, rubber gloves

1. Run engine until warm, stop engine, disconnect spark plug and battery (negative cable first).
2. Remove oil fill cap.
3. Place a pan under oil drain opening and remove oil drain plug; reinstall plug securely after oil has drained completely.
4. Spin off oil filter canister, drain oil, and discard filter according to local regulations.
5. Thoroughly wipe off filter mounting surface.
6. Make sure gasket is in place on filter canister and apply a thin film of oil to gasket.
7. Spin on new filter canister by hand until gasket just touches mounting pad, then turn an additional 1/2 to 3/4 turn. Do not overtighten.
8. Refill with API Class SG or SH oil having SAE viscosity grade appropriate for expected temperatures. See Specifications for oil capacity.
9. Reconnect spark plug and battery.
10. Start engine and run for a short time while checking for oil leaks around drain plug and oil filter. Do not overtighten.
11. Pour used oil into sealed container and deliver to nearest recycling center.

⚠ Gasoline is highly flammable and can cause severe personal injury or death.

1. Let engine cool, close fuel shutoff valve.
2. Disconnect fuel line from filter, taking care not to spill fuel.
3. Remove old filter (in-line type: loosen hose clamps).
4. Install new filter, secure connections.
5. Open fuel valve, check for leaks.