Service parts for the 3MTK-1R4
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | gasoline |
|---|---|
| Standby power | 3 kW |
| Voltage options | 115 V |
| Phase | 1 |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Cleaner and Flame Arrester - Oil Bath | 140B173 | Amazon eBay | ||
| Fuel filter | Bowl, Filter - Fuel Pump Metal (Replaces Glass Bowl #149-116) | 149-662 | Amazon eBay | ||
| Oil filter | Filter, Oil - By-pass (Replaces #122A17) | 122A27 | Amazon eBay |
Common questions
What is the power rating of the Cummins/Onan 3MTK-1R4?
The Cummins/Onan 3MTK-1R4 is rated 3 kW standby.
What fuel does the Cummins/Onan 3MTK-1R4 use?
The Cummins/Onan 3MTK-1R4 runs on gasoline.
What voltages is the Cummins/Onan 3MTK-1R4 available in?
The Cummins/Onan 3MTK-1R4 is offered in 115 V, 1-phase.
Which oil filter part number does the Cummins/Onan 3MTK-1R4 take?
The Cummins/Onan 3MTK-1R4 uses oil filter part number 122A27.
What fuel filter fits the Cummins/Onan 3MTK-1R4?
The Cummins/Onan 3MTK-1R4 uses fuel filter part number 149-662.
Which air filter part number does the Cummins/Onan 3MTK-1R4 take?
The Cummins/Onan 3MTK-1R4 uses air filter part number 140B173.
Parts
48| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 101A87 | Gasket, Rear Main Bearing Plate | 1 | Gasket | Amazon eBay |
| 101A89 | Gasket, Crankcase Inspection Plate | 1 | Gasket | Amazon eBay |
| 101A91 | Gasket, Crankcase Breather Adapter | 1 | Gasket | Amazon eBay |
| 103A70 | Gasket, Gear Cover | 1 | Gasket | Amazon eBay |
| 103B54 | Gasket, Magneto or Water Pump Drive Flange | 1 | Gasket | Amazon eBay |
| 110A292 | Gasket, Cylinder Water Outlet Adapter | 1 | Gasket | Amazon eBay |
| 110A293 | Gasket, Water Inlet Plate | 1 | Gasket | Amazon eBay |
| 110B298 | Gasket, Cylinder Base | 1 | Gasket | Amazon eBay |
| 120A69 | Gasket, Oil Pump Body | 1 | Gasket | Amazon eBay |
| 122A27 | Filter, Oil - By-pass (Replaces #122A17) | 1 | Oil filter | Amazon eBay |
| 123A7 | Gasket, Valve Inspection Plate | 1 | Gasket | Amazon eBay |
| 130A66 | Gasket, Cylinder Water Outlet | 1 | Gasket | Amazon eBay |
| 131-50 | Impeller, Rubber - For Impeller Type Pump | 1 | Impeller | Amazon eBay |
| 131A43 | Gasket, Water Pump - For Impeller Type Pump | 1 | Gasket | Amazon eBay |
| 131A44 | Gasket, Cover (Water Pump) | 1 | Gasket | Amazon eBay |
| 131B56 | Pump and Adapter Assembly, Water - Impeller Type (Replaces Gear Type Pump #132B22) | 1 | Pump | Amazon eBay |
| 131C73 | Pump and Gear Box Assembly, Water - Used on Models with Impeller Type and Magneto Ignition | 1 | Pump | Amazon eBay |
| 132B33 | Pump Assembly, Water - With Primer Fittings - Includes 132B22 - Use Kit #131 K69 | 1 | Pump | Amazon eBay |
| 132C21 | Pump and Gear Box Assembly, Water - Gear Type - Includes 132B33 | 1 | Pump | Amazon eBay |
| 140A96 | Gasket, Flame Arrester - Use with 140B173 Cleaner | 1 | Gasket | Amazon eBay |
| 140B173 | Air Cleaner and Flame Arrester - Oil Bath | 1 | Air filter | Amazon eBay |
| 141-94 | Gasket, Bowl to Body | 1 | Gasket | Amazon eBay |
| 142-31 | Gasket, Body to Bowl | 1 | Gasket | Amazon Amazon eBay eBay NAPA $14.39 |
| 142-32 | Gasket, Nozzle | 1 | Gasket | Amazon eBay NAPA $15.42 KuduParts $31.00 |
| 145A34 | Gasket, Carburetor Adapter - Used only with Marvel Schebler Carburetor | 1 | Gasket | Amazon eBay |
| 149-156 | Gasket, Filter Bowl - Fuel Pump | 1 | Gasket | Amazon eBay |
| 149-662 | Bowl, Filter - Fuel Pump Metal (Replaces Glass Bowl #149-116) | 1 | Fuel filter | Amazon eBay |
| 149A126 | Gasket, Fuel Pump Flange | 1 | Gasket | Amazon eBay |
| 149B663 | Pump Assembly, Fuel (Replaces Pump #149C54) | 1 | Pump | Amazon eBay |
| 151A12 | Gasket, Water Pump Adapter | 1 | Gasket | Amazon eBay |
| 154A24 | Gasket, Carburetor Adapter Flange - Used only with Marvel Schebler Carburetor | 1 | Gasket | Amazon eBay |
| 154A49 | Gasket, Exhaust Outlet | 1 | Gasket | Amazon eBay |
| 154A50 | Gasket, Carburetor Flange - Zenith Carburetor | 2 | Gasket | Amazon eBay |
| 160A124 | Gasket, Magneto Flange | 1 | Gasket | Amazon eBay |
| 161-42 | Gasket, End Cap Mounting - F.M. | 1 | Gasket | Amazon eBay |
| 161-6 | Gasket, End Cap Cover - F.M. | 1 | Gasket | Amazon Amazon eBay eBay FridayParts $75.60 |
| 162-1 | Gasket, Coil - Wico | 1 | Gasket | Amazon eBay FridayParts $49.99 |
| 162-16 | Gasket, Condenser Case - Wico | 1 | Gasket | Amazon eBay KuduParts $54.00 |
| 162-41 | Gasket, Impulse Stop - Wico | 1 | Gasket | Amazon eBay |
| 167-19 | Seal, High Tension Lead | 2 | Seal | Amazon eBay KuduParts $97.00 |
| 167-34 | Plug, Spark | 1 | Spark plug | Amazon Amazon eBay eBay |
| 193-6 | Gauge, Oil Pressure (Replaces #193-33) | 1 | Sensor | Amazon eBay |
| 309-2 | Switch, High Water Temperature Cut-off | 1 | Sensor | Amazon eBay |
| 309B6 | Thermostat | 1 | Thermostat | Amazon eBay |
| 501A9 | Line, Flexible Fuel | 1 | Hose | Amazon eBay |
| 509-14 | Seal, Oil - Drive Shaft - Used only with Gear Type Pump | 1 | Seal | Amazon eBay FridayParts $170.38 |
| 509-35 | "O" Ring- Used only with Impeller Type Pump and Magneto Ignition | 1 | Seal | Amazon eBay |
| 509-59 | Seal, Oil - Gear Cover (Replaces #12092) | 1 | Seal | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
Parts manual — 902-0004 Onan MTK series Genset Instruction & Parts manual (03-1962) (Onan)
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.