Sleeve/Piston Codes

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spiffy1

Member
Just curious here; does anyone know if the codes on 22-36 pistons and sleeves were date codes, size variants, or something else?

Both the original and new ones I put in are Rev D; however, the pistons & sleeves in the original were also stamped A, so were the pistons (which had a B stamp, but clearly stamped over A) while the new ones stamped D.

One of the new sleeves had a flat side [must have been a defective one, fell off the truck, or was run over, or something] and was not going to take a piston..... maybe there is some pursuation that would have made it round again, but I had prepped two old sleeves that were in my comfort level anyway [slight visual scoring after honing, but nothing you could feel; maybe .012 over; ridge reamer took care of the top - but I didn't recall them being so hard!], so just dropped one of them in instead.

Anyway, the new piston feels great in there, and nothing really measured different from what I could tell, so was just curious what the marks indicated.

Oh, it's no longer decapitated, but would likely appreciate a manifold and carb.

I lubed the ring compressor [I know you don't need it, but using that from the top, I could just shove ringless pistons right up, instead of applying the little extra force the taper required with rings on] good with some 10wt, and it shows on the sleeves; yet enough ring drag, I need the crank to turn it (pulling the crankshaft through the handholes does still, do it, but my face likely turns purple): I think the rings will seat great. Oh, music to my ears too hearing air come out the sparkplug holes when cranked. Not a surprise - I do have more faith in my work than that :lol: but when it showed up here, I tried the aircompressor on each piston, and air came out so many directions at once I didn't know what was up [6 open valves, and cross talk for at least two if not all three locations].
 
(quoted from post at 09:25:36 03/17/09)

Both the original and new ones I put in are Rev D; however, the pistons & sleeves in the original were also stamped A, so were the pistons (which had a B stamp, but clearly stamped over A) while the new ones stamped D.

I should check my grammar better before posting! :oops: More clearly:

All Rev D
Original Sleeves, also have an "A" stamp (not by the part number or rev)
Original Pistons, have an "A" stamped over an attempted "B" stamp
NOS Sleeves: "D" stamp
NOS pistons: "D" stamp
 
that was a stamping done in inspection at Thompson Products, the manufacturer of those sleeve assemblies for IH. The different letters are for sizing classifications. At that time TP was trying to class and size the sleeves and pistons to as close of a matching tolerance as they could. There is no problem mixing codes, but TP tried to match the sizing codes as close as possible for quality reasons. Someplace I have a TP book that lists this process.
 

Thanks Justin! That makes perfect sense; I thought probably size lots, but with the piston clearance on these couldn't imagine why. 8)

If you find more info, please do post it; that would be interesting.
 

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