Service parts for the 7.5MDJE-3CR
Grouped by system, with how many of each the parts manual calls for.
Fuel system
1 requiredOil system
1 requiredBelts
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | diesel |
|---|---|
| Frequency | 60.0 Hz |
| Voltage options | 120/240 V |
| Phase | 1 |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Filter, Primary Fuel | 122-0325 | Amazon eBay $75.00 | ||
| Oil filter | Filter, Oil - Standard (4-3/8") | 122-0185 | Amazon $8.99 Amazon eBay $19.55 eBay | ||
| Belt | Belt, Water Pump - sets without heat exchanger or keel cooling | 511-0067 | Amazon eBay |
Common questions
What kind of fuel does the Cummins/Onan 7.5MDJE-3CR run on?
The Cummins/Onan 7.5MDJE-3CR runs on diesel.
Which oil filter part number does the Cummins/Onan 7.5MDJE-3CR take?
The Cummins/Onan 7.5MDJE-3CR uses oil filter part number 122-0185.
Which fuel filter part number does the Cummins/Onan 7.5MDJE-3CR take?
The Cummins/Onan 7.5MDJE-3CR uses fuel filter part number 122-0325.
Parts
61| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 102-0451 | Gasket, Oil Base | 1 | Gasket | Amazon eBay |
| 103-0218 | Gasket, Backplate (gearcase) | 1 | Gasket | Amazon eBay |
| 103-0251 | Gasket, Gear Cover | 1 | Gasket | Amazon eBay |
| 110-0546 | Gasket, Glow Plug | 2 | Gasket | Amazon eBay $9.95 FridayParts $124.86 |
| 110-2464 | Gasket, Cylinder Head | 1 | Gasket | Amazon eBay |
| 115-0130 | Gasket, Rocker Cover | 1 | Gasket | Amazon eBay |
| 120-0547 | Pump Assembly, Oil | 1 | Pump | Amazon eBay $295.00 |
| 120-0580 | Gasket Kit, Oil Pump | 1 | Gasket | Amazon eBay |
| 122-0185 | Oil Filter | 1 | Oil filter | Amazon $8.99 Amazon eBay $19.55 eBay |
| 122-0188 | Gasket, Filter Adapter | 1 | Gasket | Amazon eBay |
| 122-0193 | Filter (5-1/2" Long) - Optional | 1 | Oil filter | Amazon eBay $18.32 |
| 122-0325 | PRIMARY Fuel Filter Element | 1 | Fuel filter | Amazon eBay $75.00 |
| 122-0326 | SECONDARY Fuel Filter Element | 1 | Fuel filter | Amazon eBay $65.00 |
| 130-0959 | Gasket, End Cover (heat exchanger) | 1 | Gasket | Amazon eBay |
| 131-0210 | Gasket (sea water pump) | 1 | Gasket | Amazon eBay |
| 131-0217 | Plate, Wear (sea water pump) | 1 | Pump | Amazon eBay |
| 131-0218 | Impeller (sea water pump) | 1 | Impeller | Amazon eBay |
| 131-0220 | Seal, Rotary (sea water pump) | 1 | Seal | Amazon eBay |
| 131-0257 | Pump, Water (Sea Water) | 1 | Pump | Amazon eBay |
| 131-0258 | Repair Kit, Water Pump | 1 | Pump | Amazon eBay |
| 132-0074 | Pump, Water (Captive Water) - sets with keel cooling | 1 | Pump | Amazon eBay |
| 132-0093 | Repair Kit, Water Pump (132-0074) | 1 | Pump | Amazon eBay |
| 132-0101 | Seal (captive water pump) | 1 | Seal | Amazon eBay |
| 132-0110 | Fresh Water Pump - With Metal Impeller | 1 | Pump | Amazon eBay |
| 132-0112 | Gasket, Cover (captive water pump) | 1 | Gasket | Amazon eBay |
| 132-0114 | Impeller | 1 | Impeller | Amazon eBay |
| 132-0240 | Repair Kit, Water Pump - sets with keyed area on shaft | 1 | Pump | Amazon eBay |
| 132-0241 | Repair Kit, Water Pump - sets with flat area on shaft | 1 | Pump | Amazon eBay |
| 140-0584 | Gasket, Air Cleaner | 1 | Gasket | Amazon eBay |
| 147-0243 | Gasket, Nozzle | 2 | Gasket | Amazon eBay |
| 147-0355 | Pump Assembly, Fuel Injection | 1 | Pump | Amazon eBay |
| 147-0377 | Nozzle (includes 147-0243 gasket) | 2 | Injector | Amazon eBay |
| 147-0378 | Nozzle and Holder Assembly | 2 | Injector | Amazon eBay $250.00 |
| 147-0389 | Kit, Bearing and Seal Replacement - for Injection Pump Mounting Adapter Assembly | 1 | Seal | Amazon eBay |
| 149-0517 | Gasket, Fuel Pump Bowl | 1 | Gasket | Amazon eBay |
| 149-1046 | Repair Kit, Fuel Pump | 1 | Fuel pump | Amazon eBay |
| 149-1703 | Pump, Fuel | 1 | Pump | Amazon eBay |
| 149-1964 | Bowl, Fuel Pump - Replacement Kit for sets with long (2-3/8") fuel pump bowl | 1 | Fuel pump | Amazon eBay |
| 154-1057 | Gasket, Exhaust Manifold | 2 | Gasket | Amazon eBay |
| 168-0147 | Gasket Kit, Engine | 1 | Gasket | Amazon eBay |
| 309-0130 | Thermostat | 1 | Thermostat | Amazon eBay |
| 309-0156 | High Temperature Cutoff Switch | 1 | Switch | Amazon eBay |
| 309-0162 | Switch, Temperature (opens at 240 F, closes at 195 F) - Aqualift exhaust system | 1 | Sensor | Amazon eBay |
| 333-0106 | Glow Plug (12 Volt) | 2 | Glow plug | Amazon eBay |
| 333-0107 | Plug, Glow - 24 Volt (includes gasket) | 2 | Glow plug | Amazon eBay |
| 509-0086 | Seal, Oil - Rear Housing Plate | 1 | Seal | Amazon eBay |
| 509-0087 | Seal, Oil (gearcase) | 1 | Seal | Amazon eBay |
| 509-0088 | Seal, Governor Shaft | 1 | Seal | Amazon eBay |
| 509-0117 | Seal, "O" Ring - Breather | 1 | Seal | Amazon eBay |
| 509-0132 | Seal, Oil - Intake Valve | 2 | Seal | Amazon eBay |
| 511-0067 | Water Pump Belt Heat Exchanger Pump | 1 | Belt | Amazon eBay |
| 511-0076 | Belt, Water Pump - sets with keel cooling | 1 | Belt | Amazon eBay |
| 511-0103 | Belt, Water Pump - sets with heat exchanger | 1 | Belt | Amazon eBay |
| 123-1283 | Filter, Breather Tube | 1 | Service part / kit | Amazon eBay |
| 130-1340 | Zinc Pencil | 1 | Service part / kit | Amazon eBay |
| 149-0463 | Valve, Check | 1 | Service part / kit | Amazon eBay |
| 154-0712 | Heater, Manifold | 1 | Service part / kit | Amazon eBay |
| 155-1002 | Strainer, Hull (Aqualift muffler kit) | 1 | Service part / kit | Amazon eBay |
| 309-0169 | 1 Begin Spec G 25 26 | 1 | Service part / kit | Amazon eBay |
| 504-0062 | Valve, Vacuum Relief (siphon break kit) | 1 | Service part / kit | Amazon eBay |
| 522-0314 | Overhaul Kit, Engine | 1 | Service part / kit | 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 — 968-0224 Onan 6KW 7.5KW MDJE (spec AB-AF) Marine Genset Parts manual (09-1988) (Cummins/Onan)Parts manual — 968-0325 Onan MDJE Operators Manual and Parts Catalog (Cummins/Onan)