Roller Bearing Assembly – Fits Evinrude/Johnson 70 HP (Replaces 0383955)

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Roller Bearing Assembly – Fits Evinrude/Johnson 70 HP (Replaces 0383955) is backordered and will ship as soon as it is back in stock.

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Product Details

This aftermarket Roller Bearing Assembly is engineered for Evinrude/Johnson 70 HP outboard engines from the 1977 model year. It serves as a critical component within the crankshaft and piston assembly, ensuring smooth rotational motion and reducing friction.

This part is a direct replacement for Evinrude/Johnson OEM part numbers 0383955 and 0390900.

Part Number Matrix

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

Brand	Part Number	Superseded By
Evinrude/Johnson	0383955	0390900
Evinrude/Johnson	0390900

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Evinrude Engines: This part is confirmed to fit the 70 HP model 70773S from 1977.

For Johnson Engines: This part is confirmed to fit the 70 HP model 70773S from 1977.

Brand	Model	Rated HP	Years	OEM Part No.	Notes
Evinrude	70773S	70	1977	0390900	For Crankshaft & Piston assembly. Supersedes 0383955.
Johnson	70773S	70	1977	0390900	For Crankshaft & Piston assembly. Supersedes 0383955.

Technical Specs

Product Type: Roller Bearing Assembly
Product Dimensions: 8.0" L x 6.0" W x 8.0" H

What’s in the Box

Roller Bearing Assembly (Replaces 0390900)

Installation Notes

Ensure the engine is turned off and disconnected from the power source.
Safely disconnect the fuel line and any electrical connections to the lower unit.
Disassemble the crankshaft and piston assembly according to your engine's service manual to access the old bearing.
Carefully remove the worn or damaged roller bearing assembly.
Thoroughly clean the crankshaft journal and surrounding housing, ensuring no debris remains.
Position the new roller bearing assembly, ensuring it is correctly seated.
Follow the service manual's instructions to reassemble the components, applying specified lubricants and torque settings.
Once fully reassembled, reconnect electrical and fuel lines before testing.

Troubleshooting & FAQ

How do I know if my roller bearing needs replacement?

Signs of a failing crankshaft roller bearing include excessive engine vibration, a knocking or grinding noise from the engine block, or the presence of metal shavings in the engine oil. Reduced engine performance can also be an indicator.

Will this fit my 70 HP Johnson if the model year is not 1977?

This part is only confirmed to fit the specific model 70773S from 1977. While it may fit other years in the 70 HP range, we cannot guarantee it. Always verify the OEM part number for your specific engine model and year before purchasing.

What is the function of this bearing in the crankshaft assembly?

The roller bearing assembly supports the crankshaft, allowing it to rotate smoothly within the engine block while withstanding high radial and axial loads generated by the pistons. It is essential for reducing friction and preventing wear on critical engine components.

Can I reuse my old seals with this new bearing?

It is strongly recommended to replace all associated seals and gaskets when installing a new bearing to ensure a proper fit and prevent oil or pressure leaks. Reusing old seals can compromise the repair.

What is the difference between OEM and this aftermarket part?

This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.

How fast do you ship and what does it cost?

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

What is the warranty and return policy?

This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their 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

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