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Would you guys use this used idler gear?
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Would you guys use this used idler gear?
I'm doing a major engine overhaul and bought this used idler gear. In addition to the visable bearing damage there is a slight amount of play when I put the shaft on by hand. Is this safe to use? The alternatives are replacing the bearing for abot $25.00 or buying a new gear from Walt's for about $50.00
Steve Ruddy
Guerneville CA
Guerneville CA
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- 10+ Years
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- Joined: Sat Feb 28, 2004 2:16 pm
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I received a new bearing from Case IH. First of all it isn't split like the original bearing. Second the machine shop ownwer were I got my engine work done couldn't get it to fit. He first tryed to bevel the leading edge which didn't work. Then he put it on his honing machine and the hone shoe ripped the new bearing up. He said the material was to soft. Does anyone know eactly how this is supposed to be fitted? I may have to use my original shaft and another used Idler gear I buoght from Wengers. The fit isn't perfect but Iv'e been trying to get this fixed for over 3 weeks now and done see a nice snug perfect fit in the horizon.
Steve Ruddy
Guerneville CA
Guerneville CA
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Steve,
I'm sorry you are having so much trouble.
First thing I would do it find a machinist who understands fitting babbit bearings. Obviously the one I sent is now beyond useable. If he tried to hone it he isn't a machinist, he's a klutz... babbit must be hand scraped to a final fit. Never abrasives of any kind on babbit... they will contaminate the surface.
I'll bet he doesn't even have bearing scrapers!
I'm sorry you are having so much trouble.
First thing I would do it find a machinist who understands fitting babbit bearings. Obviously the one I sent is now beyond useable. If he tried to hone it he isn't a machinist, he's a klutz... babbit must be hand scraped to a final fit. Never abrasives of any kind on babbit... they will contaminate the surface.
I'll bet he doesn't even have bearing scrapers!
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
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Steve,
The scraping process is used to improve the accuracy of a machined surface. The bearing should first be bored as accurately as possible and then final fitted to the proper oil film clearance with scraping tools. The shaft is coated with prussian blue and the parts trial fitted. The scraper removes all the blue that transfers to the bearing, (only to the high spots) along with a very small amount of babbitt. The process is performed many times... each time producing a truer surface.
Most of my scraping tools are made from old files, but some are factory made. I think the files work as well.
The earliest engine cylinders were made by this method without the use of any machine tools at all.
The scraping process is used to improve the accuracy of a machined surface. The bearing should first be bored as accurately as possible and then final fitted to the proper oil film clearance with scraping tools. The shaft is coated with prussian blue and the parts trial fitted. The scraper removes all the blue that transfers to the bearing, (only to the high spots) along with a very small amount of babbitt. The process is performed many times... each time producing a truer surface.
Most of my scraping tools are made from old files, but some are factory made. I think the files work as well.
The earliest engine cylinders were made by this method without the use of any machine tools at all.
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
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George,
The process sounds like it shouldn't be attempted by anyone who hasn't done it before. I think I'll get the bushing that came with the gear you sent me and have it reinstalled and go with it. This along with the used shaft I bought from Wengers gives the best fit out of all the combinations I've tried. I was mostly worried about the pitting in the bushing but this may actually make it take the oil better.
The process sounds like it shouldn't be attempted by anyone who hasn't done it before. I think I'll get the bushing that came with the gear you sent me and have it reinstalled and go with it. This along with the used shaft I bought from Wengers gives the best fit out of all the combinations I've tried. I was mostly worried about the pitting in the bushing but this may actually make it take the oil better.
Steve Ruddy
Guerneville CA
Guerneville CA
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Steve,
A copy of my private message...
Steve,
I'm glad you found this guy! I'm sure he will lead you right. There's no
doubt that a well fitted bronze bearing would serve you just fine. Go for
it!
George
A copy of my private message...
Steve,
I'm glad you found this guy! I'm sure he will lead you right. There's no
doubt that a well fitted bronze bearing would serve you just fine. Go for
it!
George
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
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- 10+ Years
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