Jump to content
AMC RULES

What's the "B's" mean?

Recommended Posts

AMC RULES

Kohler K-301...

found these stamped on the jug and piston, and not sure what they signify?  

 

 

post-3498-0-52998700-1401321747_thumb.jp

Share this post


Link to post
Share on other sites
 
leeave96

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

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

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

I'm assuming...   :dunno: 

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

A couple of post from Farmall Cub site ...    :confusion-shrug:

 

 

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

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

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

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

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

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.

post-8484-0-70577100-1401729411.jpg

Share this post


Link to post
Share on other sites
 
oldredrider

There you go...throwing alphabetical factors into a numerical equation.

Stop the madness!!!!!

Edited by oldredrider

Share this post


Link to post
Share on other sites
 
slammer302

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

  • Like 1

Share this post


Link to post
Share on other sites
 
AMC RULES

Style of piston?   :scratchead:

Share this post


Link to post
Share on other sites
 
slammer302

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

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

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.

attachicon.gifIMG_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
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...