Oil Seal – Fits Mercury Marine & OMC/Force Outboards (Replaces 26-14077, 26-76868)

$17.99 $28.00

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Oil Seal – Fits Mercury Marine & OMC/Force Outboards (Replaces 26-14077, 26-76868) is backordered and will ship as soon as it is back in stock.

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Product Details

This high-quality Oil Seal – Fits Mercury Marine & OMC/Force Outboards (Replaces 26-14077, 26-76868) is designed for the propeller shaft on a range of marine engines. It is engineered to fit Mercury/Mariner outboards 135–300 HP (4-Stroke, 2000 and newer), Force 90 HP models (1989–1994), and MerCruiser Alpha One Gen I & Gen II sterndrives.

This component provides a direct replacement for Mercury 26-14077/8M0204670, Mercury 26-76868, Sierra 18-2077, GLM 85130, Mallory 9-76119, OMC/Johnson/Evinrude 320862, and Force F697555.

Prevents water intrusion and lubricant leakage from the propeller shaft.
Designed for internal installation on the propeller shaft.
Constructed from a durable rubber/metal composite.

Part Number Matrix

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

Brand	Part Number	Superseded By
Mercury	26-14077	8M0204670
Mercury	26-76868
Sierra	18-2077
GLM	85130
Mallory	9-76119
OMC/Johnson/Evinrude	320862
Force	F697555

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Fits various Mercury/Mariner outboards, including DFI and 4-Stroke models. Check serial numbers for precise fitment.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	135-300 HP Outboards	135-300	4-Stroke	2000 and newer	26-14077	Superseded by 8M0204670
Mercury	V-115 DFI (2.5L)	115	2-Stroke	Multiple series	26-14077	All serials 0G960500-0T178499
Mercury	V-135 DFI (2.5L)	135	2-Stroke	Multiple series	26-14077	All serials through 1B417701+
Mercury	V-150 DFI (2.5L)	150	2-Stroke	Multiple series	26-14077	All serials through 1B417702+
Mercury	V-175 DFI (2.5L)	175	2-Stroke	Multiple series	26-14077	All serials through 1B417702+
Mercury	200-225 DFI (3.0L)	200-225	2-Stroke	Multiple series	26-14077	All serials through 1B504988
Mercury	250XS (3.0L DFI)	250	2-Stroke	Multiple series	26-14077	All serials 0T651945-1E000796
Mercury	300X (3.0L EFI) ProMax	300	2-Stroke	Multiple series	26-14077	All serials through 0T999587

Also compatible with select Force outboard models.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Force	90 HP Outboard	90	2-Stroke	1989–1994	F697555	Also fits Bravo 1 & 2 Drives

Broad compatibility with MerCruiser Alpha One (Generations I & II) and Vazer sterndrives. Verify your serial number range.

Brand	Model	Years	OEM Part No.	Notes
MerCruiser	R/MR/Alpha One	1983–1990	26-14077	Serials 6225577-0F386995
MerCruiser	Alpha One (Gen I)	1983–1990	26-14077	Serials 6225577-0F386995
MerCruiser	Alpha One SS	1986–1989	26-14077	All serials
MerCruiser	Alpha One (Gen II)	1991–1995	26-14077	Serials 0D469859-0F679999
MerCruiser	Alpha One (Gen II)	1996–1997	26-14077	Serials 0F680000-0K999999
MerCruiser	Alpha One (Gen II)	1998 and up	26-14077	Serials 0L100040 and up
MerCruiser	Vazer Drive	All years	26-14077	Serials 0W995000 and up

This seal is also listed as compatible with OMC Cobra and Stringer sterndrives.

Brand	Model	OEM Part No.	Notes
OMC	Cobra Sterndrives	320862	Shaft seal application
OMC	Stringer Drives	320862	Shaft seal application

Technical Specs

Product Type: Shaft Oil Seal
Installation: Internal, Propeller Shaft
Housing Material: Rubber/Metal Composite
Dimensions: OD: 42.9 mm (1.69 in), ID: 28.5 mm (1.12 in), Width: 6.1 mm (0.24 in)
Weight: 0.01 kg (0.02 lb)
Operating Temperature: -40°C to 120°C (-40°F to 248°F) [typical for marine oil seals]
Warranty: OEM Warranty (90-day limited warranty for OEM parts)
Other Technical Attributes: Prevents water intrusion and lubricant leakage; carrier assembly seal

What’s in the Box

2 x Oil Seal (26-14077/8M0204670)

Installation Notes

Ensure the engine is off and the propeller is secured from movement.
Remove the propeller and any associated hardware to access the old seal.
Carefully pry out the old oil seal from the propeller shaft housing, avoiding scratching the metal surfaces.
Clean the housing area thoroughly to remove any old sealant, oil, or debris.
Lightly grease the inner and outer surfaces of the new oil seal.
Gently and evenly press the new seal into place using a suitable seal driver or socket that matches the seal's outer diameter.
Ensure the seal is seated squarely and at the correct depth according to your service manual.
Reassemble all components in the reverse order of disassembly.

Troubleshooting & FAQ

How do I know if my oil seal has failed?

Signs of a failing propeller shaft oil seal include visible oil or gear lube leaking from the propeller area, water found in the gearcase oil during a change (milky appearance), or visible damage/cracking on the seal itself.

Is this seal directional?

Many shaft seals are directional, with a specific side facing the fluid they are designed to retain. Always install the new seal in the same orientation as the original. The "lipped" or "spring" side typically faces the gear oil.

What is the recommended replacement interval?

Propeller shaft seals should be inspected during every service interval (e.g., annually or every 100 hours) and replaced if any signs of wear, damage, or leakage are present. It's also good practice to replace them whenever the gearcase is disassembled for other service.

Can I install this myself?

While DIY installation is possible for those with mechanical experience and the right tools (like a seal puller and driver), we recommend professional installation to prevent damage to the new seal or gearcase housing, which could lead to immediate failure.

Why does the package include two seals?

Some gearcase designs use two seals installed back-to-back on the propeller shaft for added protection against water intrusion and oil leaks. This kit provides the necessary quantity for a complete replacement on such systems.

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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