Lower Crankshaft Oil Seal – Fits Yamaha 200-300HP Outboards (Replaces 93104-22M07-00)

Product Details

This high-quality Lower Crankshaft Oil Seal is engineered for a wide range of Yamaha 200–300HP outboards. It fits numerous Yamaha 2-stroke V, VX, VZ, Z, LZ, S, SX, L, and LX models from 1990–2010, as well as Yamaha 4-stroke F/FL/LF/VF series engines from 2010 and newer.

This part serves as a direct cross-reference for Yamaha 93104-22M07-00, Sierra 18-2091, GLM 85234, and Mallory 551-18.

• Installs in the lower crankshaft housing to prevent oil leaks.
• Engineered as an SO-Type oil seal for a precise, reliable fit.
• Includes one oil seal required for a standard replacement.

Part Number Matrix

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

Engine & Model Compatibility

Confirm your engine model and year in the tables below.

Compatibility is confirmed for the following Yamaha 2-stroke and 4-stroke outboard models.

Technical Specs

Product Type

Crankshaft Oil Seal

Installation

Lower Crankshaft

Fitting Type

SO-Type Oil Seal

Dimensions

3.0" L x 3.0" W x 0.5" H

What’s in the Box

• 1 x Oil Seal, SO-Type (Replaces 93104-22M07-00)

Installation Notes

1. Ensure the engine is off, cool, and disconnected from the power source.
2. Drain the lower unit gear lube completely.
3. Remove the propeller and then the lower unit assembly from the engine.
4. Depending on your engine, you may need to remove the powerhead to access the lower crankshaft area.
5. Carefully pry out the old oil seal using a dedicated seal puller, taking care not to scratch the crankshaft or housing surfaces.
6. Thoroughly clean the seal bore to remove any residue, old sealant, or corrosion.
7. Lightly lubricate the inner and outer surfaces of the new oil seal with marine-grade grease.
8. Using a correctly sized seal driver or socket, press the new seal into place until it is perfectly flush and evenly seated.
9. Reassemble all components (powerhead, lower unit, propeller) in the reverse order of removal.
10. Refill the gearcase with the manufacturer-specified gear lube to the correct level.
11. After reassembly, run the engine and carefully check for any signs of oil leaks around the seal area.

Troubleshooting & FAQ

Safety & Important Info

• Verify images and specifications against your original part before ordering. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
• Professional installation is strongly recommended for safety and to ensure proper performance. Incorrect installation can lead to engine damage.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
• Fast Global Fulfillment — With free standard delivery to most regions, you can expect your parts in 5–15 days.
• Manufacturer-Direct Value — We deliver fair pricing without compromising on high-quality materials or stringent quality control.