Complete Gearcase Seal Kit for Volvo Penta 250–290, 280DP, 290DP, DP-A, DP-B, DP-C & DP-D Drives — Replaces 875741

Product Details

This aftermarket complete gearcase seal kit is designed for selected Volvo Penta gearcases from 250 through 290, including 280DP, 290DP, DP-A, DP-A1, DP-A2, DP-B, DP-C, and DP-D applications. It is intended for gearcase sealing service to help restore sealing at the drive housing and protect the gearcase lubricant from water intrusion when properly installed.

The kit is listed as an aftermarket replacement for Volvo Penta OEM reference 875741. Company records also identify 876266 as an applicable OEM reference and specify that Volvo Penta 875741 corresponds to 876266 together with 876267. Do not treat 876266 or 876267 as a separate package unless purchased separately.

• Complete gearcase seal kit for the listed Volvo Penta applications
• For 250, 270, 275, 280, 285, and 290 gearcases, plus applicable DP-series drives
• Includes sealing components for the complete gearcase service identified by the manufacturer listing
• Aftermarket replacement, not a Volvo Penta-branded OEM product

Part Number Matrix

Use the references below to compare the kit with the part number shown on your original component or service documentation.

Engine & Drive Compatibility

Verify the exact gearcase designation before ordering. The fitment below is for Volvo Penta gearcases and drives identified in the company catalog record.

Technical Specs

Part Type

Complete gearcase seal kit

Application

Volvo Penta gearcase and lower-unit sealing service

Aftermarket References

Sierra 18-8357; Mallory Marine 9-77900

OEM References

875741 and 876266

Related OEM Reference

876267, identified by the company as part of the 875741 relationship

Compatible Drives

Volvo Penta 250, 270, 275, 280, 285, 290, 280DP, 290DP, DP-A, DP-A1, DP-A2, DP-B, DP-C, and DP-D

What's in the Box

• One complete aftermarket gearcase seal kit

Individual seal quantities and dimensions are not specified in the company product record. Confirm the kit contents against your drive configuration and the service procedure before installation.

Installation Notes

1. Confirm the drive or gearcase designation and compare the original seal arrangement with the compatibility information above.
2. Drain the gear oil before beginning disassembly and follow the applicable Volvo Penta service procedure.
3. Remove the drive or gearcase as required by the service manual, keeping components in order for reassembly.
4. Remove the old seals, gaskets, and O-rings included in the service area being repaired.
5. Clean and inspect all sealing surfaces for corrosion, scoring, distortion, or other damage.
6. Install the replacement components in the correct locations and orientation. Use suitable seal drivers or installation tools to avoid damaging the sealing lips.
7. Lubricate seal lips and mating components only as specified by the service procedure.
8. Reassemble the gearcase using the manufacturer's torque specifications and sealing instructions.
9. Refill with the correct gear lubricant and quantity specified for the drive.
10. Check for leakage and verify the lubricant condition after initial operation.

Troubleshooting & FAQ

What does this product replace?

The company product record identifies Volvo Penta 875741 and 876266 as OEM references. The aftermarket reference Sierra 18-8357 is documented as a complete gearcase seal kit replacing 875741. The company also lists Mallory Marine 9-77900 as an aftermarket reference.

Is this a complete upper-and-lower drive-unit kit?

This listing is a complete gearcase seal kit for the Volvo Penta applications specified by the company. The company record states that 875741 corresponds to 876266 together with 876267. Because individual quantities are not stated, verify the required sealing arrangement for your exact drive before ordering.

Will this fit 280DP and 290DP drives?

Yes. The company fitment record specifically lists 280DP and 290DP, along with DP-A, DP-A1, DP-A2, DP-B, DP-C, and DP-D. Confirm the drive designation on the unit before purchase.

Will this fit a single-prop 280 or 290 drive?

The company record lists both 280 and 290 gearcases as well as the 280DP and 290DP applications, but it does not provide a separate single-prop versus DuoProp component breakdown. Match the complete drive designation and the original OEM reference before ordering.

How do I know if the gearcase seals need replacement?

Common indicators include gear oil leakage, milky or contaminated lubricant caused by water intrusion, oil residue around housing joints, or difficulty maintaining the correct lubricant level. Replace seals whenever the relevant gearcase is disassembled for service.

Is this an OEM Volvo Penta part?

No. This is an aftermarket replacement kit. Volvo Penta numbers shown on this page are OEM reference numbers used for identification and compatibility comparison.

Do I need special tools?

A torque wrench, suitable seal drivers or correctly sized installation tools, cleaning materials, and the applicable service documentation are recommended. Some drive configurations may require additional removal or alignment tools.

Safety & Important Information

• Verify the exact drive or gearcase model and OEM reference before ordering.
• Do not rely on the number alone when different gearcase configurations are possible; keep the complete model designation together when checking fitment.
• Inspect the housing and sealing surfaces before installation. A damaged or corroded surface can cause leakage even with new seals.
• This is an aftermarket replacement, not an OEM Volvo Penta component.
• Professional installation is recommended for drive-unit service.

About Sea Sierra

• Marine replacement parts selected for practical service and maintenance applications.
• Clear aftermarket and OEM-reference information to support correct part comparison.
• Worldwide fulfillment options are shown at checkout where available.