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Wisconsin Engine Question


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#1 Bolens 1000 ONLINE  

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Posted November 21, 2011 - 06:44 AM

I'm in the process of rebuilding the TRA-10D Wisconsin engine that goes in my 1967 Bolens Estate Keeper.

When I cleaned off the piston, I saw " 1/2" Stamped into it.
Usually you will see either a "0" "1" "+.010 +.020 ect. This is the first time I recall seeing a half stamped into a wisconsin engine....
Anyone know what that means? :confuse:

#2 awol OFFLINE  

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Posted November 21, 2011 - 06:51 AM

That doesn't make sense, I would measure the bore and make sure of the size.

#3 KennyP ONLINE  

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Posted November 21, 2011 - 06:58 AM

Maybe it was only bored 1/2 way.:bigrofl:
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#4 Bolens 1000 ONLINE  

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Posted November 21, 2011 - 07:01 AM

Its Weird, even the block has the "1/2" stamped in it

#5 mjodrey OFFLINE  

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Posted November 21, 2011 - 07:35 AM

Sorry Brian,I'm not sure what "1/2" would stand for in that case.

#6 MH81 ONLINE  

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Posted November 21, 2011 - 07:47 AM

Maybe it was only bored 1/2 way.:bigrofl:


Or done " half-fast" :laughingteeth:

Never seen that either. Wouldn't be a marking for a longer stroke engine, would it?

#7 Bruce Dorsi OFFLINE  

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Posted November 21, 2011 - 09:33 AM

Anyone know what that means? :confuse:


Yes, the person who stamped it. :D

I never saw that either, Brian. .....Perhaps those stamps were put there by a rebuilder, or someone who had multiple blocks and pistons, and stamped them to match the piston to its respective bore?

Has the engine been previously bored oversize?

If the mark on the piston is off-center, maybe it was put there to mark how to re-install the piston?

Of course, these are just guesses.

#8 smasher OFFLINE  

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Posted November 21, 2011 - 09:35 PM

Dont quote me on this one but i think wisconsin used it as a grading mark, instead of tossing a block with imperfections they would overbore it slightly (not a full oversize) so it could be used.

#9 wilberj OFFLINE  

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Posted November 21, 2011 - 09:39 PM

Only .005 over?

#10 smasher OFFLINE  

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Posted November 21, 2011 - 09:46 PM

Not exactly sure, ive got a real old wisconsin manual at the shop ill have a look tomaro and see if it says anything about it

#11 Bolens 1000 ONLINE  

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Posted November 21, 2011 - 10:06 PM

Yes, the person who stamped it. :D

I never saw that either, Brian. .....Perhaps those stamps were put there by a rebuilder, or someone who had multiple blocks and pistons, and stamped them to match the piston to its respective bore?

Has the engine been previously bored oversize?

If the mark on the piston is off-center, maybe it was put there to mark how to re-install the piston?

Of course, these are just guesses.


I dont think the engine was ever taken apart before, but I could be wrong. This is the engine out of that EK10 I won at the PA auction this summer. The "1/2 is stamped off to the side of the piston, not directly in the center

#12 Bolens 1000 ONLINE  

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Posted November 21, 2011 - 10:08 PM

Dont quote me on this one but i think wisconsin used it as a grading mark, instead of tossing a block with imperfections they would overbore it slightly (not a full oversize) so it could be used.


You could be right...
Keep me posted if you find anything in the manual

Only .005 over?


I guess its possible :confuse:

#13 smasher OFFLINE  

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Posted November 22, 2011 - 09:00 PM

Indeed the oversizes read 0.005", 0.010", 0.020", 0.030". The manual says any other makings after the serial number on the block indicates "special machining" and to include it when ordering parts. If i can figure out this damn scanner i'll post the manual
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#14 Bolens 1000 ONLINE  

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Posted November 22, 2011 - 09:05 PM

Well, I guess that solves it

Thanks!

Does it happen to have a part number for the 0.005 ring set?

#15 KennyP ONLINE  

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Posted November 23, 2011 - 05:58 AM

You mean I got it right? Wow! Wild guess, there! I hadn't a clue they would do something like that.

On the rings, could you use a .010 set and grind the rings for proper end gap to fit?




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