Dribble Gear Oil Reservoir Valve Assembly for MerCruiser Alpha One Gen 2 and Bravo Drives – Replaces 18920A1
Dribble Gear Oil Reservoir Valve Assembly for 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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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Dribble Gear Oil Reservoir Valve Assembly for MerCruiser Alpha One ...
Dribble Gear Oil Reservoir Valve Assembly for MerCruiser Alpha One Gen 2 and Bravo Drives – Replaces 18920A1 is backordered and will ship as soon as it is back in stock.
Product Details
This Dribble Gear Oil Reservoir Valve Assembly is designed as a replacement for the valve installed in the bell housing of compatible Mercury MerCruiser sterndrives. It regulates gear-lube flow between the sterndrive and the monitor bottle and uses a press-fit installation with O-ring seals.
This replacement valve is listed for Mercury MerCruiser Alpha One Gen 2 sterndrives manufactured between 1991 and 1998, as well as MerCruiser Bravo 1, Bravo 2, Bravo 3, Bravo X, Bravo XR, and Bravo XZ drives. Always compare the original valve and part number before ordering.
Reference numbers associated with this replacement include Mercury/MerCruiser 18920A1, NorthBoat 18920A1, Sierra 18-7168, and GLM 80120.
- Press-fit installation in the sterndrive bell housing.
- Metal construction suitable for marine service.
- Includes two O-rings for sealing the replacement valve.
Part Number Matrix
Use this matrix to compare the listed OEM and aftermarket reference numbers with the part being replaced.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 18920A1 |
| NorthBoat | 18920A1 |
| Sierra | 18-7168 |
| GLM | 80120 |
Engine & Model Compatibility
Confirm the drive model, production year, and original part number before installation.
| Brand | Model | Years | Reference 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
- Press-fit replacement valve for the sterndrive bell housing
- Seal
- O-ring seal
- Housing Material
- Metallic brass
- Fitting Type
- Reservoir valve with O-ring seals
- Included Seals
- Two O-rings
What’s in the Box
- 1 x Dribble Gear Oil Reservoir Valve
- 2 x O-rings
Installation Notes
- Disconnect the boat’s battery and follow the manufacturer’s safety procedures.
- Lower the sterndrive to the full-down or trim position.
- Drain the gear lube from the monitor bottle located inside the engine compartment as required by the service procedure.
- Access the sterndrive bell housing and locate the existing valve.
- Carefully remove the old valve with an appropriate tool without damaging the housing.
- Clean the valve port to remove old sealant, lubricant, or debris.
- Lightly lubricate the new O-rings with fresh gear lube.
- Install the lubricated O-rings on the replacement valve.
- Align the valve with the port and press it into place until fully seated.
- Reconnect the gear-lube hose to the monitor bottle and refill with the correct lubricant according to the drive manufacturer’s service instructions.
- Inspect the valve and surrounding area for leaks before returning the drive to service.
Troubleshooting & FAQ
How do I know if this valve fits my drive?
This valve is listed for MerCruiser Alpha One Gen 2 drives from 1991–1998 and MerCruiser Bravo 1, Bravo 2, Bravo 3, Bravo X, Bravo XR, and Bravo XZ drives. Compare the original part with the listed references, including 18920A1, Sierra 18-7168, and GLM 80120, before purchase.
What are the signs of a failing dribble valve?
A damaged or worn valve may allow gear lube to leak around the bell-housing area. A monitor bottle that repeatedly loses fluid without another visible source may also indicate a leak that requires inspection.
Is this a press-fit part?
Yes. The valve is designed to press into the bell-housing port and seal with the included O-rings. It is not a threaded fitting.
Are the O-rings included with the valve?
Yes. The package includes two O-rings for the replacement valve.
How often should this part be replaced?
There is no stated routine replacement interval for this valve. Inspect it during sterndrive service and replace it if it leaks, becomes damaged, or shows deterioration.
Is this an OEM part?
This listing is for an aftermarket replacement component, not a Mercury/MerCruiser original-equipment part. Match the original component and reference number before installation.
Shipping speed and cost?
Typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options may be available at checkout where applicable.
Warranty and returns?
This product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window for items that are unused and in original condition. Contact support for applicable instructions.
Safety & Important Info
- Verify the drive model, year, original valve, and reference number before purchase.
- Do not install the part if its dimensions or configuration differ from the original component.
- This is an aftermarket replacement component, not an original-equipment manufacturer part.
- Follow the applicable MerCruiser service procedure, and use professional installation if you are not qualified to service a sterndrive.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered for dependable real-world service.
- Fast Global Fulfillment — We offer standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing and consistent quality control.
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