MerCruiser Bravo 1 Gearcase Oil Change | MerCruiser Bravo 1 Lower Unit Oil Change | Boats.net

This is an easy job, and you should replace the gear lube on your MerCruiser Bravo One once a year or every 100 hours. All you’ll need to do this is a flat head screwdriver, a pump, and the lube.

John will use the trailer switch here to get the gearcase up so it will be easier to drain. From there, he’ll open the check vent and the fill. Both of these screws have gaskets behind them, so make sure you keep track of them during this job. If you’re replacing the gaskets? Be sure to get the old ones out. Sometimes they don’t come out with the screw and you’ll need to dig them out.

Then, we’ll use a hand pump to get the fluid into the gearcase. It’s going to take around two and a half to three quarts, and you’ll know it’s full because you’ll start to see fluid come out of the vent at the top. From there, we’ll close everything back up.

Check out the pump and the lube we’re using here:

Gear lube pump:

VIDEO HIGHLIGHTS:
Draining the gearcase - 0:50
Filling the lower unit - 2:04
Replacing vent and drain plug - 2:45

Find Mercury sterndrive parts here:

Talk to us:

In the video we’re working with a MerCruiser Bravo One sterndrive, but you may have similar steps for your MerCruiser sterndrive. If you’re not sure whether these steps apply to your motor, leave a comment and we’ll get back to you.

[JoseRojas-pyne]

Thank you for what you do!! I have a bass boat with a 1998 Mercury 150hp 2 Stroke XR6 engine, it doesn't want to start at the beginning, the only way is: be with a partner who will start it and I, accelerate with my hand from inside the engine (previously remove the top cover) and Afterwards, continue working normally. Can you help me with an answer to my problem?