Gimbal Bearing Oil Seal – Fits Mercruiser Alpha One Gen I & II, R/MR, Bravo I/II/III (Replaces 26-88416)

$9.90

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Gimbal Bearing Oil Seal – Fits Mercruiser Alpha One Gen I & II, R/MR, Bravo I/II/III (Replaces 26-88416) is backordered and will ship as soon as it is back in stock.

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Product Details

This Gimbal Bearing Oil Seal – Fits Mercruiser Alpha One Gen I & II, R/MR, Bravo I/II/III (Replaces 26-88416) is engineered for a wide range of Mercruiser sterndrive applications, effectively preventing gimbal bearing grease from leaking into the bilge. It is compatible with Alpha One (Gen I & II), R/MR, and Bravo (I, II, III) series models from 1978 through the current production year.

This component is a direct replacement for Mercury/Mercruiser part numbers 26-88416 and 26-36143, as well as aftermarket equivalents Sierra 18-2094, GLM 85910, and Mallory 9-76230.

Designed for direct OEM replacement installation.
Constructed with a stainless steel housing and a high-grade Nitrile (NBR) rubber seal for superior durability.
Includes one gimbal bearing oil seal.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket brands.

Brand	Part Number
Mercury/Mercruiser	26-88416
Mercury/Mercruiser	26-36143
Sierra	18-2094
GLM	85910
Mallory	9-76230

Engine & Model Compatibility

Confirm your engine model and year in the table below.

This seal fits a wide range of Mercruiser sterndrives, including Alpha, Bravo, Blackhawk, and various legacy models. Please check your serial number against the notes provided to ensure exact fitment.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercruiser	Alpha One (Gen I)	Various	4-Stroke	1983–1990	26-88416	Sterndrive Serial 6225577-0F386995
Mercruiser	Alpha One (Gen II)	Various	4-Stroke	1991–1995	26-88416	Serials 0D469859-0F679999
Mercruiser	Alpha One (Gen II)	Various	4-Stroke	1996–1997	26-88416	Serials 0F680000-0K999999
Mercruiser	Alpha One (Gen II)	Various	4-Stroke	1998–Current	26-88416	Serial 0L100040 & Up
Mercruiser	R/MR Models	Various	4-Stroke	1983–1990	26-88416	Sterndrive Serial 6225577-0F386995
Mercruiser	R/MR Models	Various	4-Stroke	1983–1990	26-88416	Transom Assembly Serial 6216687-0F386995
Mercruiser	Blackhawk	Various	4-Stroke	1994–1995	26-88416	All serial numbers
Mercruiser	Bravo (all)	Various	4-Stroke	Various	26-88416	Serial 0B664190-0F729999
Mercruiser	Bravo Sterndrives	Various	4-Stroke	Various	26-88416	Serial 0F730000-0M100000
Mercruiser	Bravo One	Various	4-Stroke	Various	26-88416	Serial 0M100001-0W249999
Mercruiser	Bravo One	Various	4-Stroke	Current	26-88416	Serial 0W250000 & Up
Mercruiser	Bravo Two	Various	4-Stroke	Various	26-88416	Serial 0B664190-0F729999
Mercruiser	Bravo Two	Various	4-Stroke	Various	26-88416	Serial 0F730000-0M100000
Mercruiser	Bravo Two	Various	4-Stroke	Various	26-88416	Serial 0M100001-0W249999
Mercruiser	Bravo Two	Various	4-Stroke	Current	26-88416	Serial 0W250000 & Up
Mercruiser	Bravo Three	Various	4-Stroke	Various	26-88416	Serial 0B664190-0F729999
Mercruiser	Bravo Three	Various	4-Stroke	Various	26-88416	Serial 0F730000-0M100000
Mercruiser	Bravo Three	Various	4-Stroke	Various	26-88416	Serial 0M100001-0W249999
Mercruiser	Bravo Three	Various	4-Stroke	Current	26-88416	Serial 0W250000 & Up
Mercruiser	120/140	120/140	4-Stroke	1978–1982	26-88416	Serial 4893635-6225576
Mercruiser	165	165	4-Stroke	1978–1981	26-88416	Serial 4890460 & Up
Mercruiser	228	228	4-Stroke	1978–1982	26-88416	Serial 4898730-6225576
Mercruiser	260	260	4-Stroke	1978–1982	26-88416	Serial 4898730-6225576
Mercruiser	470	470	4-Stroke	1978–1982	26-88416	Serial 4893835-6225576
Mercruiser	485	485	4-Stroke	1980–1982	26-88416	Serial 4893835 & Up
Mercruiser	898	898	4-Stroke	1978–1982	26-88416	Serial 4898730-6225576

Technical Specs

Product Type: Gimbal Bearing Oil Seal
Installation: Direct OEM replacement
Housing Material: Stainless Steel with Nitrile (NBR) Rubber Seal
Dimensions: Inner Diameter: 1.375" (35mm), Outer Diameter: 3.000" (76.2mm), Width/Height: 0.293" (7.4mm)
Operating Temperature: -40°C to 121°C (-40°F to 250°F)
Other Attributes: High-grade NBR material for superior wear and abrasion resistance

What’s in the Box

1 x Gimbal Bearing Oil Seal (26-88416)

Installation Notes

Ensure the engine is off and the battery is disconnected before starting work.
Remove the sterndrive unit according to the manufacturer's service manual to access the gimbal housing.
Carefully remove the old gimbal bearing and seal, taking note of their orientation. A slide hammer or puller tool is often required.
Clean the housing bore thoroughly, removing any old grease, sealant, or corrosion.
Inspect the housing for any scoring or damage that could prevent a proper seal.
Using an appropriate seal driver, press the new oil seal into the gimbal housing until it is properly seated. Ensure it is installed square and without damage.
Install the new gimbal bearing and lubricate it as specified in your manual.
Reinstall the sterndrive, bellows, and all other components, torquing fasteners to the manufacturer's specifications.

Troubleshooting & FAQ

How do I know if my gimbal bearing seal is failing?

Signs of a failing seal include visible grease leaking into the boat's bilge area from the transom assembly, or water intrusion into the gimbal bearing, which often leads to a rumbling or grinding noise from the bearing when turning the sterndrive.

Can I replace the seal without replacing the gimbal bearing?

While technically possible, it is highly recommended to replace both the seal and the gimbal bearing at the same time. The seal must be removed to access the bearing, and a new seal is critical for protecting the new bearing from water and contamination.

Is a special tool required for installation?

Yes, a specialized seal driver or a bearing and seal driver kit is recommended to ensure the new seal is pressed in evenly and without damage to the seal's lip or outer metal casing. Improper installation can cause premature failure.

What is the difference between this aftermarket seal and the OEM part?

This aftermarket seal is designed to meet or exceed OEM specifications for fit, form, and function. It uses comparable materials, such as a stainless steel housing and NBR rubber, to provide reliable performance and durability at a better value.

How often should this seal be replaced?

The gimbal bearing oil seal should be inspected during regular annual sterndrive maintenance and replaced whenever the gimbal bearing is replaced. It should also be replaced immediately if any signs of leakage are detected.

My model is listed, but my serial number is not. Will this part fit?

The provided serial number ranges are critical for confirming fitment. If your model is listed but the serial number does not fall within the specified range, this part may not be correct. Always verify against your boat's service manual or a qualified marine mechanic.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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