Sierra 18-1368 Thrust Bearing, Replaces OMC 398901, for Johnson/Evinrude Outboard Motors

The Sierra 18-1368 is a marine thrust bearing engineered for Johnson/Evinrude outboard motors, built to meet or exceed original equipment quality. The thrust bearing is a gearcase component that manages axial load on the propeller shaft, helping the lower unit run smoothly and protecting the gearcase from premature wear. Sierra manufactures this bearing to OEM specification, making it a direct equivalent for the original part rather than a generalized substitute.

This is a compact, precision component measuring 0.75 x 4 x 5.12 inches and weighing 0.03 pounds, sized to fit into the Johnson/Evinrude gearcase exactly as the original bearing does. It is compatible with grease lubrication, consistent with standard outboard gearcase service practice. Because it is held to OEM specification, installation follows the same procedure as replacing the factory thrust bearing, with no modification required.

The Sierra 18-1368 is intended for outboard owners and marine technicians performing gearcase rebuilds or replacing a worn or damaged thrust bearing on Johnson/Evinrude outboard motors. It cross-references directly to GLM 16370 and OMC/Evinrude/Johnson 398901, so buyers can confirm fit against the original part number before ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1368
• Item Type: Thrust Bearing
• Included Components: Thrust Bearing
• Specification Met: OEM
• Compatible Lubricant: Grease
• Item Dimensions (L x W x H): 0.75 x 4 x 5.12 inches
• Weight: 0.03 pounds
• OEM Cross-Reference: GLM 16370, OMC 398901

Fitment

• Johnson/Evinrude outboard motors

Replaces (OEM)

• GLM 16370
• OMC 398901

Frequently Asked Questions

What does the Sierra 18-1368 thrust bearing fit? The Sierra 18-1368 is designed for Johnson/Evinrude outboard motors as a gearcase thrust bearing.

Is the Sierra 18-1368 the same as OMC 398901? Yes, the Sierra 18-1368 cross-references directly to OMC/Evinrude/Johnson 398901, so it is a direct equivalent for that original part number.

Does the Sierra 18-1368 cross-reference to a GLM part number? It does, the Sierra 18-1368 is interchangeable with GLM 16370.

What are the dimensions of the Sierra 18-1368 thrust bearing? It measures 0.75 x 4 x 5.12 inches.

How much does the Sierra 18-1368 thrust bearing weigh? The Sierra 18-1368 weighs 0.03 pounds.

Is the Sierra 18-1368 built to OEM specification? Yes, Sierra manufactures the 18-1368 thrust bearing to meet or exceed original equipment quality.

What lubricant should be used with the Sierra 18-1368? The Sierra 18-1368 thrust bearing is compatible with grease lubrication.

What is included when ordering the Sierra 18-1368? The package includes one thrust bearing, part number 18-1368.

Is this a genuine Sierra part or aftermarket? The 18-1368 is a genuine Sierra-manufactured thrust bearing, produced to OEM specification for Johnson/Evinrude outboard motors.

When would I need to replace this thrust bearing? A gearcase thrust bearing like the Sierra 18-1368 is typically replaced during a lower unit rebuild or when the original bearing is worn or damaged.