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ratnesh

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"Hi, I have an Alpha 1 Sterndr

"Hi, I have an Alpha 1 Sterndrive with worn out upper gears. The upper driven gear will not come off the driveshaft despite pressing with a 20 ton hydraulic press. Any suggestions as to how I could get this off. Thanks"
 
"maybe just buying a brand new

"maybe just buying a brand new upper from SEI for the $600 or whatever it is would be easier - the gears and bearings will cost you most of that anyways..and with the SEI you'll have a new driveshaft, new U joint, new seals, new housing...new everything...."
 
The repairs have been quoted $

The repairs have been quoted $1700. and new $3400. I am better off doing a top end rebuild with all parts for around $400.00.

Would still like to find out how to get the gears off the shaft though. Thanks.
 
"<[img]"http://www.marineengin

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this shaft?
 
"Put the shaft in an ice bath.

"Put the shaft in an ice bath. Heat the gear as evenly as possible with a heat gun (or torch)... try not to direct the heat at the shaft. Once the gear is hot, take it to the press again.
Before you put the new gear on, put it in the oven for an hour or so... 450° ought to do it."
 
Troy:

Will putting the gear

Troy:

Will putting the gear in an oven affect the steel's temper? When I repaired industrial electrical motors we would place the large bearings in an open core transformer about a minute and they would slide right onto the shaft.
 
"Whatever heat treatments the

"Whatever heat treatments the material has already undergone in the manufacturing process to harden it are for the most part final. Any further chemical changes are going to be very unlikely, especially for the amount of time and temperature we're talking about.
I'd be more concerned with cyclic stresses... and cracking. Don't want to take the hot gear and dunk it in cold water. Let it cool slowly.
450F is probably the highest you'd ever want or need to go. I only throw that number out because I've had some problems with bearings getting stuck on a shaft in the wrong spot during installation. I started with heating them up to 250F, got them stuck. Heated them up to Lord knows what to get them back off, put them back in the oven at 300F, got them stuck again, etc., etc. I found it a lot easiear and in the long run better for the material to be a little more bold in the first place and get her done without a lot of beating and banging."
 
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