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Join Date: Jan 2010
Posts: 41
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Measuring the little end with wax. How?
Hi Guys
I have my 993 engine sitting there awaiting refurbed heads and a set of low mile pistons and cylinders to be fitted. I want to measure the conrod little ends, but do not have a suitable tool. I was told secondhand that the journal can be filled with wax and once extracted the wax measured to giva an accurate reading. I can imagine how this might work, but has anyone actually done this and can tell me the correct wax and procedure. Actually my existing P&C's do not look bad, but the replacements have done only 36k rather than my 186k so worth going with. Many thanks... Berni |
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Join Date: Jun 2006
Location: Ballston Spa, NY
Posts: 528
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The wax procedure isn't the best method in my opinion, as the wax can distort when removing it from the bushing. Should just go buy a bore gauge for that size and use it with an appropriately sized mic to get your dimensions. The telescopic type probes are cheap, like these:
Amazon.com: Anytime Tools 6 pc 5/16" - 6" PRECISION TELESCOPIC T BORE GAUGE SET: Home Improvement
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Adam Hennessy |
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Location: Oregon
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Would love to hear how you use plastigauge in a wrist pin bushing.
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Hi
Excellent idea, they sell those sets in the UK as well. I did not know they existed. Will order one now. Many tks Berni |
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Location: Ballston Spa, NY
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Not plastigauge, "candle" wax. The theory behind it is you tape off one end of the bushing, pour hot wax into the rod to fill the bushing up, then extract/measure the wax after it cools and solidifies to determine bushing ID. Highly unorthodox, and easy to see why.
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Adam Hennessy |
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Yes, thanks Adam-- I was responding to a post that apparently the writer suddenly realized he needed to delete!
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Join Date: Feb 2005
Location: California
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Or you could get some good spring calipers and measure them with
a standard mic. andy |
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Join Date: Jun 2003
Location: St Petersburg, FL
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The wax would contract upon cooling, so it doesn't sound like a very accurate method to me.
A telescoping bore gauge set is your best bet. |
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I have always made my own go/nogo guages for small holes.
I find it easier and faster to lathe a piece of brass with a "step" in it to see if the hole is the right size. For Harleys...I use one that has 6 steps...each one is .001" bigger as it goes down the shaft. Of course...the bike engines are assembled using yardsticks anyway....LOL. Bob
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Bob Hutson |
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Hi There
I have in my possession a set of bore gauges that look like the letter "T" and two micrometers. A very old imperial traditional one, and a modern vernier digital type. I have been measuring my little ends and have found it difficult to get consistent readings with the bore gauge. Is there a best place to measure? I have been placing the gauge in the same plane as the body of the rod, ie to measure the up and down wear. I might have measured opposite the oil hole, would that have made a difference? With some practice I ended up with a set of readings of between 23.02 and 23.03mm on the digital and 90.06/07 on the imperial micrometer. I say 06/07 because it fell between those marks on the scale. Can anyone tell me what the tolerances / measurements on the little ends should be please? I saw a post on 964"s that said 23.02 +0.13mm I quickly measured one of my old cylinder bores while putting stuff away and it came out as 99.99mm. What should those measure as? Many tks Berni Last edited by berni29; 10-23-2011 at 12:29 AM.. Reason: Sp |
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Join Date: Dec 2001
Posts: 9,569
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Use a plug gage. The bore gage works better on big openings e.g. the cylinders.
A pair of plug gages set up as a go/no-go will work fine and won't cost you very much at all.
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