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  #16 (permalink)  
Old 12-05-2006, 02:11 PM
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Muncie M21 leaks

Thanks,machine shops are having a rough go of it,some in this area are closing,a good deal on a mill may come along. Thanks again for your input! Dana

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Old 12-06-2006, 01:18 AM
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Hey K-star, maybe the bulk of the 7/8 (early) boxes you see came out of light pre 66 small block cars and the 1 inch shaft ones are mostly out of BB Chevelles, Goats etc. Here Muncies were rare and whilst there was 1 known ZL1 4SPD Camaro to come here new most muncies arrived in small block cars destined for circuit racing. The only local car to have a factory muncie (called an m22 by Holden but actually a late fine spline m20) was the 1971/74 Holden Monaro GTS350 - 3400lb/275hp 350.
If a case has elongated holes here it gets bored and bushed.
Briscoe, keep that lathe tool away from a case hardened shaft. you'll create a stress riser and break it assuming you were smart enough to wear safety goggles and still have eyes to assemble the 4 spd. The welsch plug sounds like a good idea - I always thought that 1/8 inch off the front of the shaft and a plug like an sbc cam plug would work.

My first muncie was a 10 spline stud and nut M22, then I ran a sucession of m20s which allowed me to remove my ear plugs.
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Old 12-06-2006, 06:35 AM
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Muncie M21 leaks

Hey Ian,thanks for the words of caution,sounds like you may have had a bad experince,in this area mate. Will heed your warning,what k-star is doing is a neat idea anyway. And by the way,glad to see you were smart enough to wear ear plugs.
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Old 12-06-2006, 09:38 AM
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muncie

Ian, I too have considered the approach of shorting the counter shaft and installing a flat plug in the case.. But i keep thinking that when you do it you will be removing more area of the shaft to case contact.... I know 1/8" is not alot but since it's a problem now making it less would only add to the issues..IMO...

I feel i would rather have a small leak then take strength away from the pin support....


Keith
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Old 12-07-2006, 01:33 AM
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How about 4 tapped holes with a flat plate cover, it would need a small dia drain back hole into the case - say 45 degrees at 6 o'clock.
Further, like crankshafts in some early engines you could cut a 5 thou coarse thread- an 'Archimede's screw' in the cluster shaft. Ok the shaft doesn't turn but the rollers should drive the oil rearward into the case. Ol' Arc was a switched on cat for an ancient Greek, his screw still lifts millions of tons of grain and water every year.
Dunno if you folks get world news but the bushfires are pretty bad here, lots of smoke - visibility down to a 1/4 mile at times.
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