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#1
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K301 Piston Clearance
Got the engine I am rebuilding back from the machine shop today. Supposedly it was bored .020 over. Now, according to information I have seen the stock bore is 3.375 (correct me if I am wrong). The bore I have in front of me is measuring 3.390... now I'm not the best at math but that's only .015 over, and if I put a .020 over piston in it (3.385) it will only have .005 of clearance. My question is, is that enough?
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#2
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These questions can be answered here. Find and read the specifications page:
http://www.onlycubcadets.net/forum/s...ead.php?t=4646 You do know how to check piston skirt clearance correct? You use a ribbon gauge.... Unless you have a bore gauge, you can't get an accurate reading of the cylinder anyway. |
#3
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Quote:
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#4
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Then it is.
Quote:
I don't know what there is to overthink. Place the piston in the bore with a ribbon gauge thinner than the smallest clearance. Move up in size until it get tight. The next smallest one is the clearance. If a .005" gauge fits, you're good. If a .006" fits you're good. Honestly, you can run them as tight as .003", but I don't like to. Not for other people. .004"-.005" is where I like to see them. |
#5
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that's what I needed thanks
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#6
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Just make sure you check it.... don't rely on the math. I always double check my machine shop(s).
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#7
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On my last K301 rebuild, I used a machine shop I had never tried before. (ones I used to use for years, no longer exist) The guy came back with a finding that my block did not need to be bored, just honed. I was skeptical, as were some of the guys here. I wound up buying a bore gauge just for that purpose. to recheck what he said once I got it home. and the block measured just what the guy claimed that it did. As I remember tolerance says you can be as much as 0.0035" over and still be good. the machine shop said my block came out true and "square" (hard concept for some, being cylinder bores are round) at 0.0025" over standard. I found a deal I could not pass up on an NOS Kohler 0.003 over piston, which uses standard rings.
In the meantime before I found the NOS piston, I had bought the kit from "the guy" that everyone likes to use via EPay. I bought a standard kit. In comparing the NOS 0.003 o/s piston, to the "std" piston from the kit, I found that as compared to the piston measurements in the Kohler book, the kit piston was barely in tolerance, at the smallest acceptable diameter. The NOS piston was dead nuts perfect at 0.003" over. the kit piston was actually 0.0075" smaller than the NOS piston, rather than the 0.003" that I expected. so all that said I was able to restore my engine to OEM clearances (luckily) without being bored, but the kit piston would have put it at excess clearance. |
#8
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And that is why you have the new piston in hand before a shop will finish boring. So it fits. The fact that the "kit" piston was "barely in spec" is completely irrelevant. It's not an OEM part, so that is to be expected. It doesn't mean it is lesser quality, just different. I've put lots of engines together with aftermarket pistons. Well enough to be sure that they are just fine to use. If ever a new standard aftermarket piston is needed, the block should have a sleeve in it so you can fit it. This is also why most of us are so adamant about going .010" over and not honing. On a hone job, the piston is too loose.
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#9
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Man, you're good J-mech, I understand your last post, one day, I'll overhaul mine, like when I retire, just gathering information now, thanks.
Kevin |
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