Gear Lube Monitor Bottle Reservoir – Fits MerCruiser Alpha Gen 2 & Bravo (Replaces 806193A20, 19742A1, 806193A48)

Product Details

This Gear Lube Monitor Bottle Reservoir is engineered for MerCruiser Alpha Gen 2 and Bravo sterndrive models from 1988 to 1997. Designed as a direct aftermarket replacement for OEM part 806193A20, this complete reservoir kit ensures reliable gear lube monitoring and proper fluid levels for your sterndrive system.

This kit directly replaces Mercury MerCruiser part numbers 806193A20, 19742A1, and 806193A48, offering cross-platform compatibility across multiple model years.

• Complete assembly with float switch, mounting bracket, strap, and all necessary hardware
• Direct bolt-on installation for Alpha Gen 2 and Bravo sterndrives
• Compatible with standard marine gear lubricants

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Application

Gear lube monitoring reservoir

Fitment

MerCruiser Alpha Gen 2 & Bravo sterndrives

Configuration

Complete kit with float switch assembly

Mounting

Includes bracket, strap, and hardware

Compatibility

Direct OE aftermarket replacement

What's in the Box

This kit includes everything needed for a complete installation:

• Reservoir bottle
• Float switch
• Mounting bracket
• Mounting strap
• Installation hardware

Installation Notes

1. Disconnect battery negative terminal before beginning work.
2. Drain existing gear lube from the sterndrive unit per manufacturer service procedures.
3. Remove the old reservoir assembly by disconnecting the float switch wiring harness and loosening mounting hardware.
4. Position the new reservoir using the supplied bracket and strap. Align mounting holes with existing transom or engine bay mount points.
5. Secure the bracket and strap with provided hardware, ensuring the reservoir is level and firmly mounted.
6. Connect the float switch wiring harness to the boat's electrical system, matching wire colors or terminal positions.
7. Attach the gear lube supply line from the sterndrive to the reservoir inlet port.
8. Refill the sterndrive with recommended marine gear lubricant, monitoring reservoir fill level through the sight window.
9. Reconnect battery and test float switch operation by observing warning light or gauge response.
10. Run engine at idle and inspect for leaks at all connections. Top off reservoir as needed.

Troubleshooting & FAQ

How do I know if my reservoir needs replacement?

Common signs include cracks or discoloration in the bottle, a non-functional float switch (no low-lube warning), persistent leaks at fittings, or cloudy/contaminated fluid inside the reservoir indicating seal failure.

Will this fit both Alpha Gen 2 and Bravo drives?

Yes, this kit is designed to fit both MerCruiser Alpha Gen 2 and Bravo sterndrive models manufactured between 1988 and 1997. Always verify your drive model and part number before ordering.

Can I reuse my old bracket and hardware?

While the kit includes new bracket, strap, and hardware, you may reuse existing components if they are in good condition and compatible. Inspect for corrosion, cracks, or stripped threads before reusing.

What type of gear lube should I use?

Use high-quality marine sterndrive gear lubricant that meets MerCruiser specifications for your drive model. Consult your owner's manual for viscosity and additive requirements.

How often should the reservoir be inspected?

Inspect the reservoir and fluid level before each outing and during routine sterndrive service intervals (typically every 50–100 hours or annually). Replace if cracks, leaks, or float malfunction are detected.

Does the float switch require calibration?

No, the float switch is pre-calibrated and activates automatically when fluid levels drop below the safe threshold. Simply connect the wiring harness per installation instructions.