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Cummins 3800974 is the complete water pump with cast body, pulley hub, impeller and seal. It is used on Cummins 6C 8.3 litre engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Cummins 3929612, Cummins 3285323 and Cummins 3923568.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Water Pump |
| Replaces | Cummins 3923568 |
| Cross references | Cummins 3929612, Cummins 3285323, Cummins 3800974 |
| Fits | Cummins 6C, 6CT and 6CTA 8.3 litre engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 841330 |
| Country of Manufacture | China |
Cummins machines
Check the part number on your old unit before ordering.
| Cummins Part No.(SPM Part No.) | Fits |
|---|---|
| 3923568(SPM-HEP-4203) | Cummins 6C, 6CT and 6CTA 8.3 litre engines |
| Brand | Part No. |
|---|---|
| Cummins | 3923568 |
| Cummins | 3929612 |
| Cummins | 3285323 |
| Cummins | 3800974 (this page, SPM-HEP-4203) |
All of these numbers are the same part.
Coolant leak from the weep hole
Coolant dripping from the pump body means the seal has failed. Replace the pump before the engine runs low and overheats.
Overheating
A worn impeller moves less coolant. If the engine runs hot with a good thermostat and radiator, check the pump.
Bearing noise or play
A rumble or play at the pulley means the bearing is worn and the seal will follow.
Service at the same time
Change the thermostat, belts and coolant while the pump is off.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| FridayParts | USD 69.10 | 24 Oct 2026 |
| eBay (5 aftermarket sellers) | USD 75.13 to 173.54 | 25 Oct 2026 |
| Mad Hornets | USD 143.55 | 24 Oct 2026 |
| Spare Part Mart | USD 55.28 | Today |
Our price of USD 55.28 is 20% to 68% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of Cummins 3923568. It is not made by or affiliated with Cummins; the Cummins part number is used only to show what it replaces.
It fits Cummins 6C, 6CT and 6CTA 8.3 litre engines. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It is made to the same mounting and connections as the original part. Fit new gaskets and seals where they are used, and check for leaks and correct operation before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your ZIP or postcode.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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