fountainfevr

Prop is 23 Hydromotive 4 blade, turns left hand
WOT is 5300 rpm
I do have halo style drive shower
I use Mercruiser Gear lube
sheered a tooth off of upper gears.
I DO NOT RUN MY BOAT HARD!

Back4More

Do you ever get put in gear above idle speed?
You change out the gear lube every season?
Always check the Halo for clogs, a floating piece of wood gets in there from time to time.
I'm also trying the Cryo treatment on the gears, should make them a bit more wear resistant.
I would open them up every 2 seasons though.
Everything checks out with your application, switch to a GL-5 Grade lube....The Merc stuff is out dated.

fountainfevr

Please explain GL-5 lube

Back4More

Best examples...

API Category GL-4 designates the type of service characteristic of spiral-bevel and hypoid gears in automotive axles operated under moderate speeds and loads. These oils may be used in selected manual transmission and transaxle applications.

API Category GL-5 designates the type of service characteristic of gears, particularly hypoids in automotive axles under high-speed and/or low-speed, high-torque conditions. Lubricants qualified under U.S. Military specification MIL-L-2105D (formerly MIL-L-2015C), MIL-PRF-2105E and SAE J2360 satisfy the requirements of the API GL-5 service designation.

API GL-4 and API GL-5 products typically use the same extreme pressure (EP) additive system, with the API GL-5 having about twice the concentration of a API GL-4. In service, these additives become active under extreme load and temperature when the protective oil film can be squeezed away. EP additives work by forming wear-resistant compounds with the metal of the gear tooth surface. As the gears mesh, these compounds shield the gear teeth from direct metal-to-metal contact that would cause wear and damage to the gears. If too little of the active additive is present, proper protection would be compromised.

fountainfevr

Is the viscosity the same? Flow through the oil journals and flow from the resivior bottle in bilge? I know these are dumb questions but I want to be sure. Thanks for the information!

Back4More

Actually it flows better because it appears thinner and is more stable at higher temps.
GL-5 Marine Lube
http://www.amsoil.com/StoreFront/agm.aspx

I'm going to try this one next
http://www.amsoil.com/StoreFront/svg.aspx

bsirk

Sticking it from 3,800 rpm to full WOT with one jab is just as hard on them as coming out of the hole hard, if not worse, as you're way up there in the torque curve then. It is possible to accelerate like a banshee and still not risk drive failure/gear wear. Smooth is fast.

chewspit666

Hey Back4More have u had any problems w/ your bmax, i like the fact you can get a 3 year warranty no body else will step up like that.

Beak Boater

Have a friend on the board here that has a 29 with a Tyler Crockett blower motor. Got tired of braking bravo's and went with Bmax also, broke that also then had warranty issues with Bmax, didnt want to stand behind it. It also slowed the boat down by a few miles per hr.

Rebel_Heart

I switched to Royal Purple, had the lowers cyro treated when I went with the shorties. But I still really watch the stock Bravo uppers. We'll see how long they last.