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Originally Posted by cocktails
(Post 2840054)
Do you run the boat hard.??? How long have you had the XR's did they come with the 575's. Not sure of the torque number on 575's?
I hope I'm not floating in the river this summer remembering this thread and thnking they told me so.!! I'm a little pissed that Merc. does not admit to quality problems like this. 575's come standard with XR's....the boat's a 02' I'd say it gets average use....I don't baby it......but it's not at WOT all the time either....and I'm not too bad on the sticks when the water gets rough. I too have wondered if merc is having these gears made in China. It's sad, but I just put myself in a mindset that it's not "if" they're going to break, but it's "when" they're going to break. My old boat with HP500's and regular bravo's never had a drive problem in the 6 years I owned it. |
Ian, the stock gears are 61R.. I believe, if I remember correctly.
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Originally Posted by PatriYacht
(Post 2839830)
BDARCHER, I'm in the die business at GM. We use S7 as our material for trim dies. You are right it is a very tough steel, it's sometimes called chisel steel. Many times, I've thought that S7 would make a good steel for Bravo gears. We heat treat it as an air hardening steel in oven and flame hardening to about 62R. That's probably too much for gears, make them too brittle. Getting the heat treat correct would probably make or break the gears and require some experimentation, $$$.
Thanks Bob |
Originally Posted by BDARCHER
(Post 2840657)
The heat treat is the key. We have a good heat treat shop in town. What material are the Merc gears made from. Any suggestions to try. Ill setup cncs and run a few sets from different materal. $$s for gears not a problem. $$s for broke cases a problem.
Thanks Bob |
Tool steel would have to be one piece. I dont think you can friction spin weld tool steel. Looks like the teeth can be cut with a gear shaper. If not Ill have to buy them when the tine comes.
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