Service parts for the qsB4.5
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Emissions | EPA Tier 4 Final/EU Stage IV |
|---|---|
| Oil capacity | 11.6 L |
Engine
| Oil capacity | 11.6 L |
|---|---|
| Coolant capacity | 13.0 L |
| Displacement | 4.5 L |
| Aspiration | Turbocharged and Charge-Air Cooled |
| Rated speed | 1470 rpm |
Filters for the Cummins/Onan QSB4.5
4Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P550428 | Lube Filter, Spin-On Full Flow | CUMMINS 3937144, CUMMINS 3937736, NAPA 7182, TEREX 0704970120 | KuduParts $61.00 FridayParts $62.99 |
| Fuel filter | P550880 | Fuel Filter, Spin-On | CUMMINS 4897897, CUMMINS 4934845, NAPA 3682, LINDE 0009830544 | buy |
| Fuel filter | P550881 | Fuel Filter, Spin-On | CUMMINS 4897833, CUMMINS 5523458, BALDWIN BF7813, LINDE 0009830532 | KuduParts $23.00 |
| Fuel / water separator | P550848 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3973233, CUMMINS 4931955, NAPA 3732, LINDE 0019830505 | FridayParts $50.99 |
Maintenance & consumables
for the Cummins/Onan QSB4.5| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | Recommended fuel filter - primary Cummins Filtration FF5612 (Cummins 4989106); secondary element AF26125 | — | |||
| Oil filter | Recommended lube oil filter - Cummins Filtration LF3970 | LF3970 | Amazon eBay $177.58 NAPA $22.00 FridayParts $62.99 | ||
| Battery | Battery cable size - minimum of 2/0 AWG and maximum cable length not to exceed 6 ft. (1.5 m) | — | |||
| Belt | Exhaust protection - Metal guards on manifolds and turbocharger; Exhaust flex connection - Steel, flanged; Stainless steel flex, NPT | — | |||
| Coolant | Cooling system - Tube and shell type, 60 PSI with NPTF connections; recommended minimum water supply pipe size to heat exchanger .75 in. (19.05 mm); recommended minimum water discharge pipe size from heat exchanger 1.00 in. (25.40 mm) | — | |||
| Oil | Oil capacity of pan (high - low) 11.6-9.5 qt. (11-9 L) | — | |||
| Spark plug | Engine only - cold cranking amperes: 1300 CCA*; Engine only - reserve capacity: 430 minutes* | — |
Service intervals
5| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Lubricating oil | Test | 250 hr | 6 mo | First service — For high horsepower engines with Eliminator™ oil filter option: take oil samples every 250 hours and analyze per Cummins Engine Oil Recommendations Bulletin 3810340; repeat for at least three oil change intervals. |
| filters | Change | 1000 hr | with CENTINEL, depending on load factors | |
| ELIMINATOR self cleaning filter core | Other | 1500 hr | Requires servicing only every 1,500 hours. Saves up to 90% of lube system maintenance costs and increases productivity. | |
| fuel filter | Change | 1500 hr | Fleetguard NanoNet media | |
| engine oil | Change | 4500 hr | with CENTINEL, railway applications |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Engine oil | Cummins Engine Oil Recommendations Bulletin 3810340 | Used to analyze oil samples for high horsepower engines with Eliminator™ oil filter option. | |||
| Fuel | B100 biodiesel | ASTM D6751 | Must conform prior to blending; revised to include a cold soak test; stability requirement still in effect. | ||
| Fuel | B20 biodiesel blend | ASTM D7467 | Applies to biodiesel blends B6–B20; includes oxidation stability requirement; replaces Cummins' previous EMA B20 specification requirement. Must be purchased from a BQ9000 Certified Marketer; B100 must be sourced from a BQ9000 Accredited Producer. | ||
| Fuel | B5 biodiesel | All Cummins automotive and industrial engines are compatible with B5 biodiesel. | |||
| Fuel | biodiesel (Europe) | EN 14214 | Published by CEN, European Committee for Standardization. Equivalent biodiesel specifications required internationally. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
2Oil sampling for high horsepower engines with Eliminator™ oil filter option maintenance
- Take oil samples every 250 hours of operation.
- Analyze samples according to Cummins Engine Oil Recommendations Bulletin 3810340.
- Repeat for at least three oil change intervals to ensure consistent oil behavior.
Switching from petrodiesel to B20 on used engines maintenance
⚠ B20 has a solvent nature and may clean the vehicle fuel tank and lines.
- Install new fuel filters when switching to B20.
- Replace fuel filters at half the standard interval for the next two fuel filter changes.
- After the initial period, revert to intervals specified in the O & M manual.
- For EPA 2007 on-highway midrange engines, sample oil for the first 6 months to monitor fuel dilution.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What engine is in the Cummins/Onan qsB4.5?
The Cummins/Onan qsB4.5 is powered by the Cummins/Onan QSB4.5 engine.
What is the oil capacity of the Cummins/Onan qsB4.5?
The Cummins/Onan QSB4.5 engine in the Cummins/Onan qsB4.5 has an oil capacity of 11.6 liters.
What is the coolant capacity of the Cummins/Onan qsB4.5?
The Cummins/Onan qsB4.5 cooling system holds 13 liters (3.4 US gallons) for the engine, per the manufacturer specification sheet.
Which oil filter part number does the Cummins/Onan qsB4.5 take?
The Cummins/Onan qsB4.5 uses oil filter part number LF3970.
Parts
3model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| QSB6.7 | Motor | Service part / kit | FridayParts $7.50 SinoCMP $99.00 | |
| QSF2.8 | Electronic, 49 - 74 hp (37 - 55 kW) | Service part / kit | FridayParts $15.45 SinoCMP $489.00 | |
| QSX15 | QSZ13* | Service part / kit | Amazon eBay $49500.00 FridayParts $8.65 SinoCMP $149.00 |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
This page was generated from the 9 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.