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Mr. Brad VaughanJul 30, 2025
What to do if the oil pressure warning light comes on while driving a Kohler KD425-2?
- AanthonyevansJul 31, 2025
If the oil pressure warning light illuminates during operation, the engine must be stopped immediately.
What to do if the oil pressure warning light comes on while driving a Kohler KD425-2?
If the oil pressure warning light illuminates during operation, the engine must be stopped immediately.
What to do if there is a sudden unusual noise in my Kohler Engine?
If a sudden unusual noise is heard, the engine must be stopped immediately.
General| Cylinders | 1 |
|---|---|
| Cooling System | Air-cooled |
| Fuel System | Direct injection |
| Compression Ratio | 20:1 |
| Ignition System | Compression ignition |
| Engine Type | 4-stroke, air-cooled diesel engine |
| Displacement | 418 cc |
| Bore | 86 mm |
| Weight | 48 kg (105.8 lbs) |
| Stroke | 72 mm (2.83 in) |
| Starter | Recoil |
Warnings about accidental engine starts and hazards from rotating parts.
Hazards from toxic exhaust gases and extremely hot engine components.
Warnings regarding explosive fuel/gas. Keep ignition sources away.
Dangers from high-pressure fluids and electrical shock. Use caution.
Engine exhaust contains chemicals known to cause cancer, birth defects, or reproductive harm.
Tasks to be performed after the initial 50 hours of engine operation.
Procedures for checking oil level and maintaining the air filter.
Maintenance for fuel injectors and valve clearance adjustment.
Identifying the engine using model, serial, and specification numbers.
Details on RPM, EU approval code, and EPA label information.
Important notes regarding using genuine parts, measurement systems, and safe operation.
Key specifications like cylinders, bore, stroke, displacement, and operating angles.
Information on engine oil capacity and dry weight specifications.
Visual representation and table of engine dimensions in mm and inches.
Do not exceed 70% of maximum power for the first 50 hours of operation.
Importance of following instructions and using genuine parts to maintain warranty.
Using correct oil type/weight and maintaining proper level prevents wear and failure.
Selecting oil viscosity based on ambient temperature for optimal engine performance.
Understanding SAE classification based on viscosity and temperature.
Using oils that meet API, MIL, and ACEA specifications for diesel engines.
Explains API, MIL, and ACEA standards and how to interpret oil codes.
Explains ACEA sequences for gasoline and diesel engine oils.
Lists API and MIL classifications for diesel and gasoline engines.
Chart showing recommended SAE viscosity grades based on temperature.
Specifies MULTIGRADE 15W-40, AGIP SUPERDIESEL, API CF 4, ACEA E2-B2, MIL-L-46152 D/E.
Specifies the oil capacity when the oil filter is included.
Specifies the oil capacity when the oil filter is not included.
Steps for checking oil level with dipstick and adding oil correctly.
Steps for opening, cleaning, and filling the oil bath air cleaner canister.
Instructions for correctly reinstalling the air filter element and housing.
Warning about explosive fuel vapors causing injury or death. Handle fuel with extreme care.
Recommends clean diesel fuel and explains use of winter fuels below 0°C.
Guidelines for using biodiesel (B20) and aviation fuels (JP5, JP4, JP8, JET-A).
Information on low/ultra-low sulfur fuel and EPA/CARB label placement.
Do not overfill tank, leave room for expansion, clean spills, and use correct cap.
Add specific additives to diesel fuel at low temperatures to prevent paraffin solidification.
Steps to bleed fuel lines for electric and recoil start engines.
Engine must be in a near horizontal position. Ensure stability. Use factory recoil starter.
Steps for electric starting, including glow plug indicator and key positions.
Monitors engine running, oil pressure, coolant temp, or air filter status.
Indicates low fuel level or low oil pressure, potentially shutting down the engine.
Signals battery recharge failure or engine overheating; may cause shutdown.
Indicates glow plug preheating status; may signal fuse or relay failure.
Illuminates if the air filter becomes obstructed.
Running the engine at idle speed after starting.
Operating limits for the first 50 hours to break in the engine.
Steps for properly stopping the engine after operation.
Do not stop engine under load. Run at low idle before stopping.
All maintenance procedures should be performed after the engine has cooled.
Importance of using genuine Kohler parts to avoid engine wear and voiding warranty.
Procedures for checking and adding engine oil at 10-hour intervals.
Tasks for changing engine oil and replacing the oil filter after 50 hours.
Steps for washing, drying, and cleaning the oil bath air cleaner canister.
Never use low flash point solvents to clean the filter, as it could cause an explosion.
Procedures for replacing clogged filter elements and cleaning parts.
Adding engine oil to the correct level using the dipstick.
Properly mounting the element filter and cover to prevent dust entry.
Instructions for cleaning or replacing the air filter if it is dirty or damaged.
Steps for removing the dipstick, drain plug, and draining the oil.
Steps for reinstalling the drain plug, oil fill cap, and adding new oil.
Procedures for cleaning or replacing the internal oil filter.
How to check oil level and refill the crankcase with oil.
Steps for removing and replacing the external oil filter and O-ring.
Emphasizes using genuine Kohler parts for filter replacement.
Steps for removing and installing the new fuel filter.
Recommends changing the fuel filter once per year if engine usage is low.
Inspecting the air and intake manifold hoses for proper condition.
Procedure for bleeding the fuel lines as shown on page 50.
Emphasizes using genuine Kohler parts for fuel system service.
Steps for removing and replacing the internal oil filter.
Emphasizes using genuine Kohler parts for filter replacement.
Procedures for cleaning the fuel tank and replacing fuel lines.
Adjusting valve clearance and servicing fuel injectors.
Details tasks for partial engine overhaul including valve seats, pumps, timing, crankshaft, etc.
Includes partial overhaul tasks plus piston replacement, cylinder boring, valve resurfacing, etc.
Procedures to protect the engine when stored for over 6 months.
Steps to protect the engine for storage, including oil, fuel, and sealing.
Procedures to recommission the engine after storage.
Tables listing probable faults based on observed symptoms.
Lists situations requiring immediate engine stop (RPM changes, noise, fumes, oil light).
Common causes for engine not starting, like lack of fuel or blocked fuel lines.
Other potential causes for engine not starting related to valves or governor.
Faults related to fuel system, air filter, and governor linkage.
Issues with valves, crankshaft, starter motor, and cylinder head gasket.
Problems related to engine starting and stopping intermittently.
Common causes for reduced engine acceleration performance.
Causes for poor acceleration and inconsistent engine speed.
Reasons for inconsistent engine speed and RPM fluctuations.
Identifying causes for black or white smoke from the exhaust.
Issues caused by engine overload or cooling system clogs.
Reasons for low engine oil pressure, including pump or oil level issues.
Factors leading to engine overheating, such as cooling system or oil level problems.
Potential causes for engine overheating, like linkage settings or worn components.
Reasons for high engine oil consumption, like worn parts or incorrect oil.
Factors leading to insufficient engine performance.
Reasons for high engine oil consumption.
Covers causes for poor performance, excess oil consumption, and engine overload.
Addresses problems related to oil level and incomplete engine break-in.
Reasons for high engine oil consumption.
Potential sources of excessive noise from the engine.
Diagrams for internal/external alternators and the fuel system.
Diagrams for stop solenoid, lubrication system, and complete engine wiring.
Diagrams illustrating the location and function of the head temperature thermostat.
Recommended battery specifications for standard and heavy-duty operating conditions.
Identifies key components of the internal alternator system.
Identifies key components of the external alternator system.
Identifies fuel tank, filter, pump, injectors, and return line.
Diagram showing the stop solenoid, starter motor, and key switch circuit.
Identifies oil intake, pump, filter, cooler, and internal engine parts.
Diagram illustrating engine wiring, components, and connections.
Diagrams illustrating the location and function of the head temperature thermostat.
Instructions on how to obtain warranty service, including contacting dealers and service centers.
Warranty periods for emission control systems based on engine type and power.
Owner's duties for maintenance, reporting problems, and using approved fluids.
Lists parts and components covered by the emission control system warranty.
Owner's responsibility for maintenance and where warranty repairs must be performed.
Warranty periods for emission control systems based on engine type and power.
Owner's duties for maintenance, reporting problems, and using approved fluids.
Specify Engine Model, Serial Number, and Specification Number for inquiries.
Contact KohlerEngines.com or call 1-800-544-2444 for sales and service.
