AMC RULES 37,211 #1 Posted May 29, 2014 Kohler K-301... found these stamped on the jug and piston, and not sure what they signify? Share this post Link to post Share on other sites
leeave96 490 #2 Posted May 29, 2014 Don't know. Makes me wonder if it has anything to do with if the engine was bored over and "B" was used vs .010, etc. Good question! Share this post Link to post Share on other sites
dennist 139 #3 Posted May 29, 2014 Curious also and asked a guy one time similar question this is some of what I remember Not word for word, but you may get what I am saying....the b on cylinder matches b on piston due to size. Their are other letter sizes also A,B,C, ....example if you changed piston and inside bore looked good with good cross-hatches, replace with same letter(size)piston. If a little less go with a C etc. until you would need to bore etc, then it all changes? Share this post Link to post Share on other sites
wrmhaste 235 #4 Posted May 29, 2014 I ran into this on an onan motor once. From the research I did then the letter told you what head to put on. The head should be marked aswell but from what I heard and found they often wore off quick Share this post Link to post Share on other sites
AMC RULES 37,211 #5 Posted May 29, 2014 I'm assuming... there must be a letter code somewhere out there that correlates the stamped letters to pistons, rings, and bore size? I ran into this on an onan motor once. From the research I did then the letter told you what head to put on. The head should be marked aswell but from what I heard and found they often wore off quick Didn't see a mark on the head... but will recheck once I get home. Share this post Link to post Share on other sites
chazm 413 #6 Posted May 29, 2014 A couple of post from Farmall Cub site ... Postby Eugene » Fri Jun 16, 2006 6:00 pm The letter "A" is probably a factory marking to indicate which size piston to install in the cylinder bore. Factories used letters to adjust for very minor variations in cylinder bores. Postby Paul B » Fri Jun 23, 2006 12:51 pm Lonnyb That "A" probably means that engine had a .003 oversize piston in when new. In later years, Kohler stamped the piston and the block under the head, with .003 to indicate the engine was an oversize rather than standard, but if it is an older K241, the "A" may mean the same thing. I'm just guessing, but if you mike the piston and the top of the bore, it should tell if it is .003 over. Standard was 3.251. Share this post Link to post Share on other sites
wrmhaste 235 #7 Posted May 29, 2014 Now that I'm thinking about it I remember my Wisconsin 10hp had it too. that was on a bolens tractor Share this post Link to post Share on other sites
shorts 182 #8 Posted May 31, 2014 It's a code to match up a slight variance in manufacturing/machining tolerance from the factory engineered blueprint specified size, a couple of thousandths oversize or undersize on a production run of engine blocks would be assembled with the coresponding adjustment in piston size instead of scrapping the entire run of blocks. Crankshafts and rod bearings were treated the same way back in that time in history. Their was a time when Chevy changed the spec for oil clearance in the small block V8's that was dealt with an undersized rod bearing installed during assembly for many years of production to keep from changing the interchangability of parts across many years of stock engines. Share this post Link to post Share on other sites
oldredrider 2,553 #9 Posted May 31, 2014 So, in Kohler terms, the "A" stamp could have been standard bore and the "B" stamp was the .003 oversize bore and piston. Is this an example of what you are saying? Share this post Link to post Share on other sites
shorts 182 #10 Posted June 1, 2014 Yes. probably a perfect standard to print spec size would have no identifier markings and anything else would be coded in some way Share this post Link to post Share on other sites
Wishin4a416 2,192 #11 Posted June 2, 2014 The K-series that I just redid had 0 stamped on the block. Not a very good picture, but it is on the valve side between the 2 headbolt holes. Share this post Link to post Share on other sites
oldredrider 2,553 #12 Posted June 2, 2014 (edited) There you go...throwing alphabetical factors into a numerical equation. Stop the madness!!!!! Edited June 2, 2014 by oldredrider Share this post Link to post Share on other sites
slammer302 2,156 #13 Posted June 2, 2014 From what I was told its the style of piston used. my k241 had a b or c stamped on it I can't remember know 1 Share this post Link to post Share on other sites
AMC RULES 37,211 #14 Posted June 3, 2014 Style of piston? Share this post Link to post Share on other sites
slammer302 2,156 #15 Posted June 3, 2014 What I was talking about is the style A piston used in some k241 can go in either direction unlike the c&d style piston's that only go in one direction Share this post Link to post Share on other sites
slammer302 2,156 #16 Posted June 3, 2014 Maybe their is a B style can't say for sure though just spiculation Share this post Link to post Share on other sites
Fordiesel69 271 #17 Posted June 3, 2014 The K-series that I just redid had 0 stamped on the block. Not a very good picture, but it is on the valve side between the 2 headbolt holes. IMG_1968.JPG So jealous of that nice 16HP K341 you have there. Bet it runs like new when you are done. Share this post Link to post Share on other sites