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General Chat (Vincent Related)
Jig to Hold Head in Lathe
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<blockquote data-quote="Cyborg" data-source="post: 153450" data-attributes="member: 3426"><p>I have seen a lot of knackered pistons in my day, but nothing quite like that. Sometimes a 2 stone hone in the wrong hands can achieve an uneven surface in a wet cylinder because the liner actually flexes. In other words, the liner gets pushed out into the water jacket from the pressure of the stone so the amount of material removed is inconsistent. That can’t explain what you have there. I can understand how an inexperienced operator can get the bore out of round, but how does the hone chatter enough to leave peaks and valleys like that? If the guy was using a portable rigid hone, the vibration would cause all of his fillings to fall out. I have done a few cylinders with a portable rigid hone and I don’t recall having one start to chatter on me. He must have been trying to remove way too much material (and too fast) without boring the cylinders first…. then wore himself out before achieving enough clearance? There has to be more to the story… I have a manual somewhere that shows just about every conceivable piston failure…. I’ll try and find it and have a look, but don’t think they list one like that. The author of the manual would likely want to interview the guy that did that work…. assuming someone hasn’t extruded him through a sewer grate.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 153450, member: 3426"] I have seen a lot of knackered pistons in my day, but nothing quite like that. Sometimes a 2 stone hone in the wrong hands can achieve an uneven surface in a wet cylinder because the liner actually flexes. In other words, the liner gets pushed out into the water jacket from the pressure of the stone so the amount of material removed is inconsistent. That can’t explain what you have there. I can understand how an inexperienced operator can get the bore out of round, but how does the hone chatter enough to leave peaks and valleys like that? If the guy was using a portable rigid hone, the vibration would cause all of his fillings to fall out. I have done a few cylinders with a portable rigid hone and I don’t recall having one start to chatter on me. He must have been trying to remove way too much material (and too fast) without boring the cylinders first…. then wore himself out before achieving enough clearance? There has to be more to the story… I have a manual somewhere that shows just about every conceivable piston failure…. I’ll try and find it and have a look, but don’t think they list one like that. The author of the manual would likely want to interview the guy that did that work…. assuming someone hasn’t extruded him through a sewer grate. [/QUOTE]
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Jig to Hold Head in Lathe
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