Service parts for the C Series
Grouped by system, with how many of each the parts manual calls for.
Fuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Oil capacity | 19.0 L |
|---|
Maintenance & consumables
for the Cummins/Onan 6CT8.3| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Cummins Premium Blue | — | 1000 hr | ||
| Fuel filter | Fuel pump-governor combination | 2278784 | Amazon eBay | ||
| Oil filter | Oil & Filter Change, Fuel Filter | 19096 | Amazon eBay FridayParts $18.60 | ||
| Battery | 12 Volt 1800, 640, 1280, 480; 24 Volt 900, 320, 640, 240 | — | 8000 hr | ||
| Belt | — | 2500 hr | |||
| Coolant | Every 64,000 KM [40,000 Miles], 2,000 Hours Or 2 Years Interval | — | 2000 hr | ||
| Coolant filter | DCA4 | — | 8000 hr | ||
| Oil | Cummins Premium Blue | — | 2000 hr | ||
| Spark plug | — | 2000 hr |
Common questions
What engine does the Cummins/Onan C Series use?
The Cummins/Onan C Series is powered by the Cummins/Onan 6CT8.3 engine.
What's the oil capacity on a Cummins/Onan C Series?
The Cummins/Onan 6CT8.3 engine in the Cummins/Onan C Series has an oil capacity of 19.0 liters.
What oil filter fits the Cummins/Onan C Series?
The Cummins/Onan C Series uses oil filter part number 19096.
What fuel filter does the Cummins/Onan C Series use?
The Cummins/Onan C Series uses fuel filter part number 2278784.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Warm Engine | Injection Pump Set too low idle screw setting. | Replace pump. Check/adjust low idle speed screw. |
| Air in Fuel System | Bleed fuel system. See Authorized Repair Facility and check for suction leaks. | |
| Injection Timing incorrect | Check/correct injection timing. | |
| Injector Nozzles Plugged or Inoperative | Replace injectors. | |
| Broken Engine Mounts | Replace mounts. | |
| Wrong High Pressure Lines | Install correct lines. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan C Series troubleshooting guide (59 entries) →
Parts
31| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 19094 | Oil & Filter Change | Oil filter | Amazon eBay $500.00 | |
| 19095 | Oil & Filter Change | Oil filter | Amazon eBay $67.43 | |
| 19096 | Oil & Filter Change, Fuel Filter | Oil filter | Amazon eBay FridayParts $18.60 | |
| 19465 | Fuel Filter & Chassis Lube | Fuel filter | Amazon eBay $17.99 | |
| 19469 | Oil & Filter Change | Oil filter | Amazon eBay $38.00 | |
| 19470 | Chassis Lube, Check Belts, Hoses | Belt | Amazon eBay | |
| 19486 | Allison 4-Speed Trans Oil Change | Oil | Amazon eBay $47.99 | |
| 19507 | Allison 4-Speed Trans Oil Change | Oil | Amazon eBay | |
| 2278784 | Fuel pump-governor combination | Fuel filter | Amazon eBay | |
| 30211 | Fuel Filter & Chassis Lube | Fuel filter | Amazon eBay | |
| 30216 | Chassis Lube, Check Belts, Hoses | Belt | Amazon eBay | |
| 30363 | Allison 6-Speed Trans Oil Change | Oil | Amazon eBay | |
| DM-3801373 | Gasket Set - 6CT 8.3 | 1 | Gasket | Amazon eBay |
| DM-3928389 | Fuel Injector - 6CT 8.3 | 1 | Injector | Amazon eBay |
| FP-6C83PREM | 6C/6CT8.3 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| FP-IFK6C83PREM | 6C/6CT8.3 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| LF3000 | Lube, Spin-On | 1 | Oil filter | Amazon $128.45 eBay $76.00 |
| 19097 | Complete Service | Service part / kit | Amazon eBay $24.00 FridayParts $30.60 | |
| 19098 | Complete Service & Check | Service part / kit | Amazon eBay | |
| 19472 | Change Differential Oil | Service part / kit | Amazon eBay $25.00 | |
| DM-3802010 | Main Bearing Set Standard - 4BT 3.9, 6BT 5.9, 6CT 8.3 | 1 | Service part / kit | Amazon eBay |
| DM-3802439 | Piston Ring Set - 6CT 8.3 | 1 | Service part / kit | Amazon eBay |
| FP-3356824 | 6C/6CT8.3 In-Frame Kit (contains FP-3802403 Cyl Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3356825 | 6C/6CT8.3 In-Frame Kit (contains FP-3802404 Cyl Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3356826 | 6C/6CT8.3 In-Frame Kit (contains FP-3802406 Cyl Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3356827 | 6C/6CT8.3 In-Frame Kit (contains FP-LK92479937 Cyl Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3357573 | 6C/6CT8.3 In-Frame Kit (contains FP-3802263 Piston Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3357574 | 6C/6CT8.3 In-Frame Kit (contains FP-3802601 Piston Kit) | 1 | Service part / kit | Amazon eBay |
| FP-3357803 | 6C/6CT8.3 In-Frame Kit (contains FP-3802344 Piston Kit) | 1 | Service part / kit | Amazon eBay |
| M-5316172 | Valve Spring | Service part / kit | Amazon eBay | |
| M-5316173 | Valve Spring | 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
Engine spec — 4000073 (Cummins/Onan)Service manual (Cummins/Onan)Service manual — Cummins Diesel C Series Manual 1988 (2) (Cummins/Onan)Service manual — RV Maintenance Price Brochure List01