Service parts for the 3.5 KP
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Common questions
Which air filter part number does the Cummins/Onan 3.5 KP take?
The Cummins/Onan 3.5 KP uses air filter part number 185-3737.
Parts
27| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 185-3009 | Comp.Muffkw | 1 | Assy | Amazon eBay |
| 185-3013 | Plug, Spark | 2 | Spark plug | Amazon |
| 185-3230 | Starter Assy, Recoil | 2 | Starter | Amazon |
| 185-3737 | Filter, Air | 2 | Air filter | Amazon eBay |
| 185-3738 | Breather Valve, Inlet | 2 | Valve | Amazon |
| 185-3744 | Exhaust Valve | 2 | Valve | Amazon |
| 185-3768 | Gasket Pin Float | 2 | Gasket | Amazon |
| 185-3793 | Cover Gasket | 2 | Gasket | Amazon |
| 185-3795 | Cap, Spark Plug | 2 | Spark plug | Amazon |
| 185-4071 | Diode Assy | 1 | Assy | Amazon eBay |
| 185-3033 | Nut Washer, Plain | 2 | Service part / kit | Amazon |
| 185-3231 | Bolt Pipe, Breather | 2 | Service part / kit | Amazon |
| 185-3496 | Coil, Ignition | 2 | Service part / kit | Amazon |
| 185-3692 | Magneto Assy | 2 | Service part / kit | Amazon |
| 185-3725 | Rotor | 2 | Service part / kit | Amazon |
| 185-3734 | Cap, Fuel Tank | 2 | Service part / kit | Amazon |
| 185-3735 | Crankshaft | 2 | Service part / kit | Amazon |
| 185-3736 | Diode Assy | 2 | Service part / kit | Amazon |
| 185-3749 | Spring, Valve Retainer | 2 | Service part / kit | Amazon |
| 185-3786 | Regulator | 2 | Service part / kit | Amazon |
| 185-3794 | Plate, Reel Case | 2 | Service part / kit | Amazon |
| 185-3796 | Key, Woodruff | 2 | Service part / kit | Amazon |
| 185-3961 | Screw Cord Id-Terminal | 2 | Service part / kit | Amazon |
| 185-3996 | Frame Pipe 1 | 2 | Service part / kit | Amazon |
| 185-4027 | Box Assy Control | 2 | Service part / kit | Amazon |
| 185-4045 | Muffler Assy | 2 | Service part / kit | Amazon |
| 185-4628 | Assy Carburetor Main Jet | 2 | Service part / kit | Amazon |
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 — 981-0231 Onan 3.5 KP Parts Manual (6-1985) (Cummins/Onan)