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) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Dribble Gear Oil Reservoir Valve – Fits MerCruiser Alpha One Gen 2 ...
Product Details
This Dribble Gear Oil Reservoir Valve Assembly is engineered for a precise fit on Mercury MerCruiser Alpha One Gen 2 sterndrives manufactured between 1991 and 1998, as well as all MerCruiser Bravo series drives (Bravo 1, 2, 3, X, XR, & XZ). It functions as a crucial component within the bell housing to regulate gear lube levels from the monitor bottle.
This part is a direct replacement for several OEM and aftermarket part numbers, including Mercury/MerCruiser 18920A1, NorthBoat 18920A1, Sierra 18-7168, and GLM 80120.
- Installs directly into the bell housing via a press-fit design.
- Constructed from marine-grade brass for durability in harsh saltwater and freshwater environments.
- Includes the two essential O-rings required for a leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 18920A1 |
| NorthBoat | 18920A1 |
| Sierra | 18-7168 |
| GLM | 80120 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Designed for specific Mercury MerCruiser sterndrive models as listed.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Alpha One Gen 2 | 1991–1998 | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo 1 | All years | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo 2 | All years | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo 3 | All years | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo X | All years | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo XR | All years | 18920A1 | Sterndrive bell housing component |
| MerCruiser | Bravo XZ | All years | 18920A1 | Sterndrive bell housing component |
Technical Specs
- Product Type
- Dribble Gear Oil Reservoir Valve Assembly
- Installation
- Direct replacement for OEM valve in bell housing
- Connection
- Press fit with O-ring seal
- Housing Material
- Marine-grade brass/metal
- Housing Color
- Metallic brass
- Fitting Type
- Reservoir valve with O-ring seals
- Other Technical Attributes
- Includes 2 O-rings (Mercury 25-48171)
What’s in the Box
- 1 x Dribble Gear Oil Reservoir Valve (18920A1)
- 2 x O-Rings (25-48171)
Installation Notes
- Disconnect the boat's battery for safety.
- Lower the sterndrive to the full down/trim position.
- Drain the gear lube from the monitor bottle located inside the engine compartment.
- Access the sterndrive bell housing and locate the old dribble valve.
- Carefully pry out the old valve using an appropriate tool, being cautious not to damage the housing.
- Thoroughly clean the valve port in the bell housing to remove any old sealant or debris.
- Lightly lubricate the new O-rings with fresh gear lube.
- Install the lubricated O-rings onto the new valve.
- Align the new valve with the port and press it firmly into place until it is fully seated.
- Reconnect the gear lube hose to the monitor bottle and refill with the correct type and amount of lube.
- After refilling, check for any leaks around the new valve before reconnecting the battery.
Troubleshooting & FAQ
How do I know if this valve fits my drive?
This valve is confirmed to fit MerCruiser Alpha One Gen 2 drives (1991–1998) and all Bravo series drives (1, 2, 3, X, XR, XZ). The best way to ensure compatibility is to match your old part number to 18920A1 or one of the listed aftermarket cross-references like Sierra 18-7168.
What are the signs of a failing dribble valve?
A failing dribble valve typically causes a slow but persistent gear lube leak originating from the bell housing area. You might also notice that the gear lube monitor bottle consistently loses fluid over time without an obvious external leak source. This can often be mistaken for a more serious seal failure.
Is this a press-fit part?
Yes, this is a press-fit valve. It does not use threads. It is designed to be pressed firmly into the port in the bell housing, where it is secured by the two included O-rings to create a tight seal.
Are the O-rings included with the valve?
Yes, the package contains the valve and the two required O-rings (equivalent to Mercury 25-48171), providing everything needed for a standard replacement.
How often should this part be replaced?
There is no manufacturer-specified replacement interval for the dribble valve. It should be inspected during routine maintenance and replaced if it shows any signs of leaking, physical damage, or becoming brittle. It is often replaced preventatively during a major sterndrive service.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility. Each batch is inspected for quality and consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options are available at checkout where applicable.
Warranty & returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears on a compatibility list—do not install.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended for safety, proper function, and to prevent potential 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 warehouses worldwide, we offer free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
Payment & Security
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