Dribble Gear Oil Reservoir Valve – Fits MerCruiser Alpha One Gen 2 and Bravo Drives (Replaces 18920A1)

Dribble Gear Oil Reservoir Valve – Fits MerCruiser Alpha One Gen 2 and Bravo Drives (Replaces 18920A1)

This dribble gear oil reservoir valve is a direct replacement for the OEM valve located in the bell housing of specific MerCruiser sterndrive units. It is designed to fit MerCruiser Alpha One Gen 2 sterndrives (1991–1998) and all Bravo series drives (1, 2, 3, X, XR, and XZ).

This assembly directly replaces Mercury/MerCruiser part number 18920A1 and other aftermarket equivalents, including NorthBoat 18920A1, Sierra 18-7168, and GLM 80120.

• Complete Kit: Includes the valve assembly and two new O-rings for a complete installation.
• Installation Method: Features a press-fit design for a secure, leak-free connection in the bell housing.
• Durable Construction: Made from marine-grade brass for excellent corrosion resistance and longevity.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Dribble Gear Oil Reservoir Valve (Replaces 18920A1)
• 2 x O-Rings (Replaces Mercury 25-48171)

Installation Guide

Follow these steps for proper installation. Professional installation is recommended.

1. Locate and carefully remove the old dribble valve from the sterndrive bell housing.
2. Thoroughly clean the valve seat area to ensure it is free of debris and corrosion.
3. Lightly lubricate the new O-rings with a small amount of marine grease or gear lube.
4. Install the new O-rings onto the new valve assembly.
5. Firmly press the new valve assembly into the bell housing until it is fully and evenly seated.
6. Reconnect any gear lube monitor lines that were disconnected during removal.

Troubleshooting & FAQ

How do I confirm this fits my MerCruiser engine?
This valve is compatible with MerCruiser Alpha One Gen 2 drives manufactured between 1991 and 1998, as well as all production years of Bravo 1, 2, 3, X, XR, and XZ drives. The surest way to confirm fitment is to match your original part number to 18920A1 or one of the other cross-referenced numbers (Sierra 18-7168, GLM 80120).

What are the signs of a failing dribble valve?
Common symptoms include a persistent gear lube leak observed around the bell housing area or frequent alarms from your gear lube monitor system, which may indicate a loss of fluid or pressure caused by a faulty valve seal.

Is this a difficult part to install?
The installation is a press-fit application and is generally straightforward for individuals with marine mechanical experience. However, due to the importance of achieving a proper seal to prevent gear lube leaks, we recommend professional installation to ensure correct fitment and function.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.