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Re: Want to Talk to Experienced Engine Rebuilder
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Posted by Mr. Goodwrench on November 24, 2003 at 20:15:24 from (12.72.72.212):
In Reply to: Want to Talk to Experienced Engine Rebuilder posted by moonlite on November 23, 2003 at 16:31:13:
Well, Moonlite. There you have it. Over a dozen shadetree experts, machinists, and rebuilders have given you their years of accumulated experience and wisdom. And did the chorus all sing with one voice? HECK NO! They all seem to have different answers and different reasons for having those answers. The real answer is this. Every crank is engineered, cast, machined, hardened and ground for a specific application which will operate under a projected set of parameters. A high revving V8 ego booster and a slow turning high torque 1950's diesel operate in entirely different regimes with tremendously disparate loads, stresses, rotational velocities and temperatures. THERE IS NO RULE OF THUMB TO TELL YOU HOW MUCH YOU CAN SAFELY GRIND A CRANK WITHOUT SACRIFICING SAFETY OR SERVICE LIFE!!!!!
So the intelligent thing to do is, refer to the specifications and advice given in the MANUFACTURER'S shop service/overhaul manual( not I&T, the real service manual). The recommendations and limits given there will be made with respect to the specific crank that you have and will have passed in front of the engineers and metallugists who designed the durn thing and know how much weakening will occur. They have a good handle on when to regrind, how much you can regrind, and when to scrap the thing because further regrinding will be a losing proposition. Now how many of those well meaning, self proclaimed experts want to argue against that recommendation? Listen, one time I read a post where one of these city boy genius mechanics was trying to find out which tractor had the thickest cylinder sleeves, so that he could bore it out 1/16" and make a puller ot of it. He couldn't for the life of him understand why I and another fellow told him BAD IDEA. He knew so little that he didn't know how little he knew! BE CAREFUL following the advice of these 'been there, done that" types. Follow the manufacturer's spec's and advice and let the shadetree boys sit around the gas pumps and ruin their own equipment. GOOD LUCK, Mr. G
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