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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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<blockquote data-quote="cdmccul" data-source="post: 123831" data-attributes="member: 9318"><p>Those are the tools (give or take) that a shop will use to measure the flatness of the deck and head, yes.</p><p></p><p>As for the cross hatch... You want some roughness to the cylinder walls (not polished mirror finish) to give the new piston rings a proper surface to seat into. I think it is that first, if the surface is mirror polish it is too hard to wear away slightly, AND second the idea that if the walls are too hard, the new rings won't also polish to a mating exact same shape.</p><p></p><p>I didn't get much past that level of detail in tech school, as my goal wasn't to be a machinist. You obviously don't want to too rough that you feel it, that will cause too much wear to the rings. But you don't want it too smooth because then the rings won't wear in.</p><p></p><p>It will NOT affect the head gasket.</p><p></p><p>Internal engine work is always a game of how much is enough and how much is correct/perfect.</p><p></p><p>It mostly ran when it died, right? So you only HAVE to fix what broke. It will obviously still run as good (or as bad) as it did when you tore it down. But, see how much work this has been to get this far? When do you stop? If you change just the gasket, and in 100 hours you suddenly have super low compression in one cylinder, you have to pull it all back out and do it over again. If you only change the gasket and hone the cylinders, and then get a rod knock from a bad bearing, now you have to do it all over again, again.</p><p></p><p>So... Anything you do is better than doing nothing... Right?</p></blockquote><p></p>
[QUOTE="cdmccul, post: 123831, member: 9318"] Those are the tools (give or take) that a shop will use to measure the flatness of the deck and head, yes. As for the cross hatch... You want some roughness to the cylinder walls (not polished mirror finish) to give the new piston rings a proper surface to seat into. I think it is that first, if the surface is mirror polish it is too hard to wear away slightly, AND second the idea that if the walls are too hard, the new rings won't also polish to a mating exact same shape. I didn't get much past that level of detail in tech school, as my goal wasn't to be a machinist. You obviously don't want to too rough that you feel it, that will cause too much wear to the rings. But you don't want it too smooth because then the rings won't wear in. It will NOT affect the head gasket. Internal engine work is always a game of how much is enough and how much is correct/perfect. It mostly ran when it died, right? So you only HAVE to fix what broke. It will obviously still run as good (or as bad) as it did when you tore it down. But, see how much work this has been to get this far? When do you stop? If you change just the gasket, and in 100 hours you suddenly have super low compression in one cylinder, you have to pull it all back out and do it over again. If you only change the gasket and hone the cylinders, and then get a rod knock from a bad bearing, now you have to do it all over again, again. So... Anything you do is better than doing nothing... Right? [/QUOTE]
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Bobcat 632 - Blown Head Gasket?
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