Oil Seal – Fits Mercury/MerCruiser 100-250 HP: Outboards & Alpha/Bravo Drives (Replaces 26-76868, 26-30550)
Oil Seal – Fits Mercury/MerCruiser 100-250 HP: Outboards & Alpha/Bravo Drives (Replaces 26-76868, 26-30550) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Oil Seal – Fits Mercury/MerCruiser 100-250 HP: Outboards & Alpha/Bravo Drives (Replaces 26-76868, 26-30550) is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality 18-2002 Marine Oil Seal is engineered to deliver a reliable, leak-free seal for the gear housing on a wide range of marine engines. It is designed for various Mercury/MerCruiser 100-250 HP outboards (1980s–current) and Alpha One/Bravo stern drives. It also fits select Honda outboards and Johnson/Evinrude/OMC models that specify equivalent part numbers.
This component serves as a direct interchange for several OEM and aftermarket part numbers, including Mercury 26-76868, 26-30550, Honda 91252-ZW1-003, Johnson/Evinrude 0320862, and Sierra 18-2002.
- Commonly installed to seal the prop shaft or drive shaft in the lower unit.
- Features a machined housing for a precise, secure fit and optimal sealing performance.
- Backed by Sierra's Limited Lifetime Warranty for peace of mind.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 26-73838 |
| Mercury | 26-70019 |
| Mercury | 26-76868 |
| Mercury | 26-30550 |
| Mercury | 26-8M0204670 |
| Sierra | 18-2002 |
| GLM | 85130 |
| Honda | 91252-ZW1-003 |
| Johnson/Evinrude/OMC | 0320862/320862 |
| Mallory | 9-76202 |
| Chrysler/Force/US Marine | 26-76868 |
Engine & Model Compatibility
Confirm your engine model and year/serial number in the tables below to ensure correct fitment.
This seal fits a wide variety of Mercury outboards and MerCruiser stern drives. Please verify your model against the corresponding serial number range.
| Brand | Model | Rated HP | Stroke | Years / Serial # | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 100 (4 CYL.) | 100 | 4-Stroke | 0A722297–0G760299 | 26-76868 |
| Mercury | 100 (4 CYL.) | 100 | 4-Stroke | 9523034–0P016999 | 26-76868 |
| Mercury | 115 (4 CYL.) | 115 | 4-Stroke | 0C100000–0G760299 | 26-76868 |
| Mercury | 115 (4 CYL.) | 115 | 4-Stroke | 9559771–0P016999 | 26-76868 |
| Mercury | 115 (6 CYL.) | 115 | 4-Stroke | 5600967 & Up | 26-76868 |
| Mercury | 120XR2 (JET DRIVE) | 120 | 2-Stroke | 2000 (0E369300–0E379999) | 26-76868 |
| Mercury | 120XR2 (POWERHEAD) | 120 | 2-Stroke | 1999 (0E345000–0E369299) | 26-76868 |
| Mercury | 120XR2 (POWERHEAD) | 120 | 2-Stroke | 2000 (0E369300–0E384499) | 26-76868 |
| Mercury | 125 (4 CYL.) | 125 | 4-Stroke | 0D283222–0G760299 | 26-76868 |
| Mercury | 150 HP Pro XS 6 CYL (2.5L) | 150 | 2-Stroke | 1B690542–2B535572 | 26-76868 |
| Mercury | 200 DFI JET DRIVE (POWERHEAD) | 200 | 2-Stroke | 0E384500 & Up | 26-76868 |
| Mercury | 200 HP 6 CYL (2.5L) | 200 | 2-Stroke | 0G960500–0T800999 | 26-76868 |
| Mercury | 200 HP DTS 6 CYL (3.0L) | 200 | 2-Stroke | 0T980000–1B417701 | 26-76868 |
| Mercury | 225 (3.0L CARB) | 225 | 2-Stroke | 0G760300–0T408999 | 26-76868 |
| Mercury | 225 HP 6 CYL (2.5L) | 225 | 2-Stroke | 0G960500–0T800999 | 26-76868 |
| Mercury | 250 (3.0L EFI) | 250 | 2-Stroke | 0G760300–0T408999 | 26-76868 |
| Brand | Model | OEM Part No. |
|---|---|---|
| MerCruiser | R, MR | 26-76868/26-30550 |
| MerCruiser | Alpha One | 26-76868/26-30550 |
| MerCruiser | Alpha One SS | 26-76868/26-30550 |
| MerCruiser | Bravo I, II, III | 26-76868/26-30550 |
| MerCruiser | SSM II/III/IV/V | 26-76868/26-30550 |
Technical Specs
- Product Type
- Gear Housing Oil Seal
- Installation Location
- Drive Shaft/Gear Housing
- Dimensions
- O.D.: 43mm (1.692"), I.D./Shaft Size: 30.2mm (1.188"), Width: 6.4mm (0.250")
- Housing Material
- Machined
- Common Application
- Sealing the prop shaft or drive shaft in the lower unit.
- Weight
- 0.04 lbs (0.018 kg)
- Warranty
- Limited Lifetime (via Sierra)
What’s in the Box
- 2 x Oil Seal (replaces 26-76868)
Installation Notes
- Disconnect the battery and ensure the engine is stable and secure before beginning work.
- Drain the gearcase lubricant completely into an approved container.
- Remove the propeller, gearcase housing, and any other components obstructing access to the seal.
- Carefully pry out the old oil seal using a seal puller or flat-head screwdriver, taking care not to scratch the housing.
- Thoroughly clean the seal bore in the gear housing to remove any old sealant, corrosion, or debris.
- Lightly lubricate the outer edge of the new seal and the inner lip with marine grease.
- Position the new seal squarely over the bore and press it in evenly using a socket or seal driver of the correct diameter. Ensure it is fully seated.
- Reassemble the gearcase, propeller, and all other components in reverse order of removal.
- Refill the gearcase with the manufacturer-specified lubricant to the correct level.
- After a short run time, re-check for any signs of leaks around the new seal.
Troubleshooting & FAQ
How do I confirm this seal fits my specific engine?
The best way is to check the compatibility tables on this page against your engine's model and serial number. You can also match the OEM part number stamped on your old seal to the numbers listed in our Part Number Matrix.
What are the signs of a failing oil seal?
Common symptoms include visible oil leaking from the propeller shaft area, milky or water-contaminated gear lube (check your dipstick or drain plug), or a persistent rainbow sheen on the water around your lower unit.
When should I replace my lower unit oil seals?
It is best practice to replace lower unit seals whenever you have the gearcase apart for other service (like a water pump replacement). Otherwise, they should be replaced immediately if you notice any signs of leaking.
Are any special tools required for installation?
While basic tools can work, using a dedicated seal puller for removal and a seal driver or appropriately sized socket for installation is highly recommended to prevent damage to the new seal or the gearcase housing.
Is this seal for the propshaft or driveshaft?
This oil seal is commonly used in both prop shaft and driveshaft applications in the lower unit, depending on the specific engine model. Please consult your service manual to confirm the exact location for your drive.
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 and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, 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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