The Cummins/Onan QSL9 is a 8.9 L 6-cylinder turbocharged and air cooled intercooler engine rated at 1600 rpm, producing up to 404 kW. It powers generator sets from Cummins/Onan, including the CFP9E-F10, CFP9E-F20, CFP9E-F30 and CFP9E-F40. It holds 24 L (6.3 gal) of oil and 47 L (12.4 gal) of coolant.
Also known as: Cummins QSL9
Part of the Cummins/Onan QSL9 engine family — 11 variants share parts & fitment.
| Oil capacity | 24.0 L |
|---|---|
| Coolant capacity | 47.0 L |
| Displacement | 8.9 L |
| Cylinders | 6 |
| Aspiration | turbocharged and air cooled intercooler |
| Rated speed | 1600 rpm |
| Gross power | 404 kW |
| Code | Meaning |
|---|---|
| 251 | Unknown J1939 Fault |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Recommended fuel filter - primary: Cummins Filtration FF5580; Recommended fuel filter - secondary: Cummins Filtration FS1212 | — | find | ||
| Oil filter | Recommended lube oil filter: Cummins Filtration LF9009 | LF9009 | Amazon eBay $100.00 PartsGeek | ||
| Belt | Exhaust protection - Metal guards on manifolds and turbocharger; Exhaust flex connection - Steel, flanged; Stainless steel flex, NPT | — | find | ||
| Coolant | Recommended cooling water filter: Cummins Filtration WF2074 | WF2074 | Amazon eBay $34.00 PartsGeek | ||
| Oil | Oil pressure range at rated: 40-60 PSI (276-414 kPa) | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 0518-0548-15 | Clamp | clamp |
| 0518-0548-22 | Clamp | clamp |
| 0518-0548-29 | Clamp | clamp |
| 0518-0548-35 | Clamp | clamp |
| A056F113 | Clamp | clamp |
| A052T655 | Gasket | gasket |
| A047A980 | Heater, Blanket | heater |
| A045P359 | Hose, DEF | hose |
| A045P417 | Hose, DEF | hose |
| A051B439 | Hose, DEF | hose |
| A030X751 | Box | other_service |
| A030Y642 | Hinge | other_service |
| A031A954 | Panel, Enclosure | other_service |
| A034N673 | Grill, Enclosure | other_service |
| A034N943 | Bolt, Carriage | other_service |
| A034P011 | Bolt, Carriage | other_service |
| A034P012 | Washer, Flat | other_service |
| A034P026 | Screw, Hex Flange Head | other_service |
| A034P039 | Nut | other_service |
| A034P108 | Screw, Hex Flange Head | other_service |
| A035H898 | Screw, Hex Head | other_service |
| A035P345 | Lead, Electrical | other_service |
| A041D550 | Header, Door | other_service |
| A041E195 | Panel, Enclosure | other_service |
| A041E396 | Panel, Enclosure | other_service |
| A041E596 | Header, Door | other_service |
| A041E928 | Post, Enclosure | other_service |
| A041M317 | Door, Control | other_service |
| A041S526 | Insulation, Door | other_service |
| A046F214 | Panel, Enclosure | other_service |
| A046F238 | Panel, Enclosure | other_service |
| A047V570 | Panel, Window | other_service |
| A052S411 | Latch | other_service |
| A053J589 | Screw, Hex Head | other_service |
| A053J591 | Screw, Hex Head | other_service |
| A053T433 | Padlock, Attachment | other_service |
| A055G556 | Screw, Socket Head | other_service |
| A056C784 | Latch, Mechanical | other_service |
| A056H470 | Hinge | other_service |
| A056M306 | Bolt, Carriage | other_service |
| A063L015 | Door, Enclosure | other_service |
| A063L064 | Header, Door | other_service |
| A063L069 | Header, Door | other_service |
| A063L072 | Panel, Enclosure | other_service |
| A063L080 | Panel, Enclosure | other_service |
| A064U218 | Cover, Electrical Connector | other_service |
| A072Y708 | Door, Enclosure | other_service |
| A072Y709 | Panel, Enclosure | other_service |
| A045J792 | Pump, Doser (See Page 70 for Components) | pump |
| 0821-0016 | Screw, Locking | screw |
| 0821-0029 | Screw, Locking | screw |
| 0821-6002-03 | Screw, Hex Head | screw |
| 0821-6003-01 | Screw, Hex Head | screw |
| A030Y648 | Edging, Seal (3.304 FT) | seal |
| A047V572 | Seal, Weather | seal |
| A054S414 | Seal, Door | seal |
| A054S416 | Seal, Door | seal |
| A046D072 | Strap, Tank | strap |
| A049G884 | Tank, DEF Complete (Includes Header and Heated Blanket) (See Page 66 for Components) | tank |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan QSL9 engine has an oil capacity of 24.0 liters.
The Cummins/Onan QSL9 has a displacement of 8.9 liters with 6 cylinders.
The Cummins/Onan QSL9 powers 13 generator set(s), including Cummins/Onan CFP9E-F10, Cummins/Onan CFP9E-F20, Cummins/Onan CFP9E-F30, Cummins/Onan CFP9E-F40, Cummins/Onan CFP9E-F50.