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| Fritz Maurer
12-03-2012 18:52:41
216.137.138.146
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How does a machinist know the diameter of the next undersize? I'm taking a crank to a shop who probably does not have a listing for a W-12. I was planning on getting the bearings from Rice's, but I am hesitant to have them provide the dimensions to the machinist; if the crank turns out wrong, I'm stuck with it. I would rather the guy doing the job find out for himself. I have never heard of a crank being refused for lack of information, that's why I wondered if there was some other way of checking the diameter. Thanks, Fritz
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| Bill Krosnicki
12-05-2012 07:59:24
50.124.48.137
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Re: Turning a crankshaft in reply to Lucid, 12-03-2012 18:52:41
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| Quoting Removed, click Modern View to see
I'm pretty sure he can get them, the w-12 has the same engine as the F-12 and parts for them are widely available.
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| El Toro
12-04-2012 13:57:38
108.3.143.30
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| The machinist should have a manual that covers all or most farm tractors. Hal
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| ihcowner
12-04-2012 12:20:14
99.197.107.145
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| A W-12 has the same diameters as the A,B,C, cranks. The rod bearings are the exact same and the mains will work with a little grinding.
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| teddy52food
12-05-2012 06:37:42
184.94.175.179
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Re: Turning a crankshaft in reply to ihcowner, 12-04-2012 12:20:14
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| Just from memory , rods are 1.7495 & mains are 2.1245.
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| gene bender
12-04-2012 06:48:30
207.177.56.85
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| Let the machine shop take care of the bearings or just let them turn it so its ready for the new bearings if it has to turned over 30 thous get another crank. They will know what the specs are.
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| mike1972chev
12-04-2012 06:03:25
75.149.81.173
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| | The BEST machine shops will usually refuse to do machine work WITH OUT the new replacement parts in hand. Tolerances could be slightly off.The BEST guys are checking everything BEFORE turning them down.If not,you can end up with sloppy machine work,or even worse,a "junk" un useable crank shaft. If they ARE a GOOD shop,they should be able to produce any engine bearing made.If not,I would question their back ground in doing crank shafts myself. BTW,My engine guy WILL NOT EVEN think about boring a block with out the new pistons,or any other major work with out the replacement parts sitting right there with him.
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| Notjustair
12-03-2012 19:40:18
174.255.3.170
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| I have always either had the machinest supply me with bearings after doing the grinding or write down EXACTLY what I am to get. It seems like you are putting the cart before the horse.
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| Fritz Maurer
12-03-2012 19:57:17
216.137.138.146
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Re: Turning a crankshaft in reply to Notjustair, 12-03-2012 19:40:18
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| What * if * he * can't * get * them ?
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| Owen Aaland
12-03-2012 20:11:41
216.47.35.179
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 19:57:17
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| Quoting Removed, click Modern View to see
He starts by checking to see what is available for bearings before turning the shaft.
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| teddy52food
12-03-2012 19:32:20
184.94.175.179
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| I used to grind shafts. We had a book that had the forging numbers of cranks and the specs. Journal sizes and stroke . Also listed the undersizes of bearings available. A shop with a grinder will have the info too.
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| Earl-IL
12-03-2012 19:26:29
50.81.209.158
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| Email sent on specifications. Earl
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| David G
12-03-2012 18:55:33
205.215.206.18
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Re: Turning a crankshaft in reply to Fritz Maurer, 12-03-2012 18:52:41
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| There are reference books for crankshafts that the machinists will use.
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