Sierra International 18-2138 Pivot Pin Bearing, Replaces OMC/Volvo Penta 911787

The Sierra International 18-2138 is a machined pivot pin bearing used in gimbal housing and U-joint assemblies. It is a direct replacement for the OEM bearing found in these assemblies and is built to the same fit and function as the original part it replaces. The bearing has a compact, precise profile designed to seat correctly in the pivot pin bore, allowing smooth articulation of the gimbal ring or U-joint during steering and trim movement.

This bearing is finished in white and features a machined construction for consistent, repeatable fit. It is a small, lightweight component at just 0.02 pounds, and the original equipment application calls for three of these bearings per gimbal housing, so most rebuilds require replacing the full set rather than a single unit. The 18-2138 is commonly stocked alongside related gimbal-bearing service parts such as oil seals and foam seals used in the same housing.

Because gimbal and U-joint bearings see constant flexing and exposure to grease, water intrusion, and load from steering and shifting, worn or pitted bearings are a common source of play, vibration, or steering stiffness in stern drive units. Replacing the 18-2138 as part of a gimbal bearing service restores proper pivot action and helps prevent premature wear on the pivot pin itself.

Specifications

• Brand: Sierra International
• Manufacturer Part Number: 18-2138
• Product Type: Pivot Pin Bearing
• Color/Finish: White
• Construction: Machined
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.02 pounds
• Quantity Used Per Application: 3
• UPC: 030999311528

Replaces (OEM)

• 911787

Frequently Asked Questions

What does the Sierra 18-2138 pivot pin bearing replace? The 18-2138 replaces OEM number 911787, the bearing used in the gimbal housing and U-joint pivot pin assembly it is designed for.

How many of these bearings does one gimbal housing use? Three 18-2138 bearings are used per gimbal housing in the original application, so a full bearing service typically requires replacing all three rather than a single unit.

Is the 18-2138 a genuine Sierra part or aftermarket? It is a Sierra International part, sold under Sierra's own part number 18-2138 as a direct-fit replacement bearing.

What size is the 18-2138 bearing? The bearing measures 0.39 x 0.39 x 0.39 inches, a compact size intended to seat directly in the pivot pin bore.

How much does the 18-2138 pivot pin bearing weigh? It weighs 0.02 pounds, reflecting its small, compact bearing design.

What is the 18-2138 bearing made of or finished with? The 18-2138 has a machined construction with a white finish.

What other parts are typically replaced along with the 18-2138 bearing? Gimbal housing rebuilds that use the 18-2138 pivot pin bearing often also involve replacing related oil seals and foam seals in the same housing, since all of these wear from the same water and grease exposure.

Why would a pivot pin bearing need to be replaced? Worn or pitted pivot pin bearings, such as the 18-2138, are a common cause of play, vibration, or stiffness in gimbal and U-joint steering movement, so replacing them restores proper articulation.

Does the 18-2138 come as a single bearing or a set? The 18-2138 is supplied as an individual bearing; since the application uses three per housing, buyers needing a full rebuild should order the quantity needed for their assembly.

Is the OEM number 911787 the only cross-reference for this bearing? 911787 is the confirmed OEM cross-reference number for the Sierra 18-2138 pivot pin bearing.