Raw Water Pump Rebuild Kit for Volvo Penta & OMC 3.0–7.4L Engines – Replaces 3857794, 3858847
Raw Water Pump Rebuild Kit for Volvo Penta & OMC 3.0–7.4L Engines – Replaces 3857794, 3858847 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Raw Water Pump Rebuild Kit for Volvo Penta & OMC 3.0–7.4L Engin...
Raw Water Pump Rebuild Kit for Volvo Penta & OMC 3.0–7.4L Engines – Replaces 3857794, 3858847 is backordered and will ship as soon as it is back in stock.
Product Details
This comprehensive raw water pump rebuild kit is designed for selected side-mounted raw water pump configurations used on Volvo Penta and OMC gasoline marine engines from 3.0L through 7.4L. It supplies the principal wear items needed to service and rebuild a compatible pump assembly.
The kit is listed as a replacement for Volvo Penta references 3857794, 3858847, 3855778, 3862281, 3851623, 3851982, and 3851995. Always compare the part number, pump configuration, and existing components before ordering.
- For selected side-mounted raw water pump configurations.
- Includes SKF or KBC bearings with contact seals on both sides, as applicable to the kit variation.
- Includes a shaft seal with a marine-grade 316 stainless steel spring.
- For compatible gasoline marine engines; verify the exact engine model and pump before installation.
Part Number Matrix
Use the following references to compare the pump application across OEM and aftermarket listings. A reference number alone does not confirm every engine or pump configuration.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3857794 |
| Volvo Penta | 3858847 |
| Volvo Penta | 3855778 |
| Volvo Penta | 3862281 |
| Volvo Penta | 3851623 |
| Volvo Penta | 3851982 |
| Volvo Penta | 3851995 |
Engine & Model Compatibility
The applications below represent the listed Volvo Penta and OMC engine families that may use the compatible side-mounted raw water pump. Confirm the complete engine model code, pump part number, and pump design before purchase.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Volvo Penta/OMC | 3.0L 181 CID Inline 4 | 3857794, 3858847 | 302CMBYC, 302CMBYM, 302CMLKD, 302CMNCA, 302CMNCS, 302CPBYC, 302CPBYM, 302CPLKD, 302CPNCA, and 302CPNCS models |
| Volvo Penta/OMC | 3.0L 181 CID Inline 4, S-suffix models | 3857794, 3858847 | 302CMNCA, 302CMNCS, 302CPNCA, and 302CPNCS |
| Volvo Penta/OMC | 4.30L 262 CID V6 | 3857794, 3858847 | 432APNCA, 432BPBYC, 432BPLKD, 432BPNCS, 434APNCA, 434BPBYC, 434BPLKD, 434BPNCS, 43APHUB, 43FAPNCA, 43FBPBYC, 43FBPLKD, and 43FBPNCS |
| Volvo Penta/OMC | 5.0L 305 CID V8 | 3857794, 3858847 | 502APHUB, 502APHUE, 502BPBYC, 50FAPHUB, 50FAPHUE, 50FAPNCA, 50FAPNCS, and 50FBPBYC |
| Volvo Penta/OMC | 5.70L 350 CID V8 | 3857794, 3858847 | 572BPBYC, 572BPLKD, 572BPLKR, 572BPNCS, 574BPLKD, 57FAPLKD, 57FAPNCA, 57FAPNCS, 57FCPBYC, 57FCPBYD, 57FCPLKD, and 57FDPLKD |
| Volvo Penta/OMC | 5.80L 351 CID V8 | 3857794, 3858847 | 584APHUB, 584APHUE, 58FAPHUB, 58FAPHUE, 58FBPHUB, 58FBPHUE, 58FBPNCA, 58FCPNCA, and 58FCPNCS |
| Volvo Penta/OMC | 7.40L 454 CID V8 | 3857794, 3858847 | 744EPNCA, 744FPLKD, 744FPNCS, 74FFPNCA, 74FGPLKD, 74FGPNCS, 74FHPBYC, 74FJPBYC, and 74FJPBYD |
Technical Specifications
- Product Type
- Raw water pump rebuild kit
- Application
- Selected side-mounted raw water pump assemblies
- Engine Type
- Compatible gasoline marine engines, subject to model and pump verification
- Bearing Type
- SKF or KBC bearings with contact seals on both sides, depending on kit variation
- Seal Spring
- 316 stainless steel spring
What's in the Box
- 2 x SKF or KBC bearings with contact seals on both sides, as applicable to the kit variation
- 4 x stainless steel hex bolts
- 1 x shaft seal with 316 stainless steel spring
- 1 x retaining ring
- 1 x replacement impeller
- 1 x shaft O-ring
- 2 x end-cover gaskets
- 1 x impeller lubricant
Important: A replacement pump cam or other optional component may vary by kit version and is not guaranteed unless it is specifically shown and listed as included for the selected purchase.
Installation Notes
- Disconnect the vessel's battery and close the raw water intake seacock.
- Place a catch pan under the pump to collect spilled water or coolant.
- Loosen the belt, if belt-driven, and carefully remove the pump hoses.
- Unbolt the pump from the engine and remove it for service.
- Disassemble the pump on a clean workbench, recording the orientation of each component.
- Clean the housing and remove old gasket material, corrosion, and debris.
- Carefully remove the old bearings and seals using suitable tools.
- Press the replacement bearings and seals into place, ensuring they are fully seated and correctly oriented.
- Inspect the pump shaft and cam. Reuse serviceable components or replace them separately if worn, scored, or damaged. Install the new impeller, O-ring, and gaskets from the kit.
- Reinstall the pump cover and tighten the fasteners to the engine or pump manufacturer's specifications.
- Reinstall the pump, reconnect the hoses, and set the belt tension correctly.
- Open the seacock, check for leaks, reconnect the battery, and run the engine while confirming proper raw-water flow.
Troubleshooting & FAQ
How do I know if this rebuild kit fits my specific engine?
Match your existing raw water pump's part number with the references in the Part Number Matrix, then compare the complete engine model code with the compatibility table. The pump configuration must also match. If the pump or part number differs, confirm fitment before ordering.
What are the signs that a raw water pump needs to be rebuilt?
Common signs include water leaking from the pump's weep holes, engine overheating at idle or low speed, reduced water flow from the exhaust, or grinding and bearing noise. A cracked, brittle, or damaged impeller also indicates that service is required.
Is a replacement pump cam included?
Not necessarily. Kit contents can vary. Treat the pump cam or other optional component as not included unless it is specifically listed and shown as part of the selected kit. Inspect the existing cam and replace it separately if it is worn or damaged.
How often should the raw water pump impeller and seals be replaced?
Inspect the impeller at least annually and replace it according to the engine or pump manufacturer's maintenance schedule. Frequent operation in silty, sandy, or debris-filled water may require more frequent inspection. A full rebuild is generally appropriate when the bearings or seals show wear.
Is it better to rebuild the pump or buy a new one?
Rebuilding is a practical option when the pump housing and shaft remain serviceable and are free from cracks, severe corrosion, or excessive scoring. If the housing or shaft is damaged beyond service limits, replacing the complete pump assembly may be more appropriate.
Is this an OEM part?
No. This listing is for an aftermarket replacement rebuild kit. The kit is intended for the listed applications, but it is not sold as a Volvo Penta or OMC genuine OEM kit.
What are the shipping options?
Standard shipping is generally free, with typical transit of 5–15 days. Expedited options may be shown at checkout where available.
What are the warranty and return terms?
The product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the applicable standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.
Safety & Important Information
- Verify the pump part number, configuration, dimensions, and component arrangement against the original assembly before purchase.
- Do not operate the engine without opening the raw-water seacock and confirming proper water flow.
- Replace damaged housings, shafts, cams, or other components that are outside the manufacturer's service limits.
- This is an aftermarket replacement kit, not a genuine OEM component.
- Professional installation is recommended when servicing a marine cooling system.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts selected for dependable service in real-world operating conditions.
- Fast Global Fulfillment — Free standard delivery is available to most regions, with typical transit of 5–15 days.
- Manufacturer-Direct Value — Competitive pricing without compromising material selection and quality control.
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