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Old 05-09-2018, 02:23 AM   #1
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Default Bravo 2 noise

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I have a 3000 scr with bravo 2's the port side when in idle there is a low bearing noise coming from it. I can hear from on the boat and outside.
When I removed the upper unit fluid cap there was a lot of metallics in the fluid. The lower unit had none.
Also my gimbal bearing was installed last year at the end of the season.

Does this sound sound like the upper unit bearings?

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Old 05-09-2018, 02:45 AM   #2
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The upper unit has gears as well as the cone clutch, if the vent plug has a magnet and there are metallic filings on it something is failing. Does the boat still shift into forward and reverse? Does the sound change when doing so?
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Old 05-09-2018, 03:14 AM   #3
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The upper unit has gears as well as the cone clutch, if the vent plug has a magnet and there are metallic filings on it something is failing. Does the boat still shift into forward and reverse? Does the sound change when doing so?
The vent plug does not have a magnet.
But the fluid that came out was full of metal.

I will check in the morning about noise change in gear.

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Old 05-09-2018, 04:18 AM   #4
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If make noise when is not in shift, I would stop right there.
You can make more damage by gearing.
If you don't know how to fix it, go to a shop. DON'T USE IT LIKE THAT!
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Old 05-09-2018, 11:28 AM   #5
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If make noise when is not in shift, I would stop right there.
You can make more damage by gearing.
If you don't know how to fix it, go to a shop. DON'T USE IT LIKE THAT!
At this point the OP is already looking at a total rebuild or replacement, one or two shifts will not make a difference.
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Old 05-09-2018, 02:00 PM   #6
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The vent plug does not have a magnet.
But the fluid that came out was full of metal.

I will check in the morning about noise change in gear.
I've never seen a Bravo 3 drain plug that was not magnetized. The vent plug (upper) and the drain plug (lower) are the same, but metal wouldn't collect at the vent plug. The metal settles to the bottom of the drive after it has been sitting for a while (cold) and should get attracted to the lower drain plug.

Was the engine run for some time prior to draining the lube? That would disperse the metal shavings throughout the lube.

If I were to guess, I'd say you're bearings are shot, and needles are failing and getting ground in the gears like a coffee grinder. This begins to cause shearing of the gear teeth. Over time, there are more metal shavings and the noise grows not just because of the bearings, but also the grinding of the shavings in the gears.

I hit a submerged object a few years ago and sheared a tooth on an upper gear. That made one heck of a racket.
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Old 05-09-2018, 02:03 PM   #7
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BTW, you would be looking at a complete rebuild. New Bearings, new seals, and more than likely, new gears. When I priced it out, it was a bit more money for a new drive, but well worth it. The Aluminum on B3's are known to corrode. I was showing corrosion on the anti-ventilation plate, the plate above and the fin. So it made more sense for me to replace the entire drive.

Your mileage may vary.
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Old 05-09-2018, 04:30 PM   #8
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shrew I agree with everything you said other than the OP stated he has BII not BIII and the BII are not as prone to the corrosion issues the BIII has.
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