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 |
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 $36.06 eBay $177.58 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.
Which oil filter part number does the Cummins/Onan qsB4.5 take?
The Cummins/Onan qsB4.5 uses oil filter part number LF3970.
Parts
6model family| Part # | Description | Qty | System | |
|---|---|---|---|---|
| QSB4.5 | Service part / kit | FridayParts $7.50 | ||
| QSB6.7 | Motor | Service part / kit | FridayParts $7.50 | |
| QSF2.8 | Electronic, 49 - 74 hp (37 - 55 kW) | Service part / kit | FridayParts $15.45 | |
| QSF3.8 | Service part / kit | FridayParts $21.75 | ||
| QSG12 | Service part / kit | Amazon eBay FridayParts $12.35 | ||
| QSX15 | QSZ13* | Service part / kit | Amazon eBay FridayParts $8.65 |
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.