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Tecumseh Motor Physical Size


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#1 chieffan ONLINE  

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Posted May 17, 2015 - 08:45 PM

I have a 1255 tractor that has an OH140 engine installed.  The OH120 is single belt drive where the OH140 is dual belt drive, when in their respective tractors.  None of the stock belts are the correct size.  I need the distance from the bottom of the motor to the center of the crank shaft on both motors.  This difference will provide the correct belt length for this odd application.  Thanks much in advance.



#2 EricFromPa ONLINE  

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Posted May 18, 2015 - 12:18 AM

1255 originally had an HH120 in it with no Oil pan.HH140 has an Oil Pan.There is usually a 1" difference in height depending on what the HH140 came out of.You might be able to just do away with the 1" spacers under the engine and be able to run stock length belts.

 

I can get you measurements off of a HH100 if it helps.They are the same block as the HH120.


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#3 chieffan ONLINE  

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Posted May 18, 2015 - 06:58 AM


1255 originally had an HH120 in it with no Oil pan.HH140 has an Oil Pan.There is usually a 1" difference in height depending on what the HH140 came out of.You might be able to just do away with the 1" spacers under the engine and be able to run stock length belts.

 

I can get you measurements off of a HH100 if it helps.They are the same block as the HH120.

Don't know if there is a difference between an HH140 and an OH140 physically but the number off the tin is 143-680012 and the serial is 0080E.  This is a Craftsman engine made by Tech.  When I researched that number it came up as an OH140.  Not that familiar with Tech engines so you will know a lot more about that than I do.


Edited by chieffan, May 18, 2015 - 07:00 AM.


#4 drbish ONLINE  

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Posted May 18, 2015 - 04:59 PM

I can not give you that measurement my tecumseh engine spec book says to see full line sales catalog.I do have these dimensions The OH 140 crank appears to be a little higher.

oh120.JPG oh140.JPG

 

 


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#5 chieffan ONLINE  

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Posted May 18, 2015 - 08:40 PM

I am using a link belt at present.  Will take it off in the morning and get the measurement for length and go from there.  I am sure the 14 hp engine crank is higher than the 12hp when measured from the base of the engine.



#6 MH81 ONLINE  

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Posted May 18, 2015 - 09:16 PM

I have a oh160 I can measure, if that would help.
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#7 EricFromPa ONLINE  

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Posted May 18, 2015 - 10:58 PM

Crap I forgot about measuring the HH100.I'll get ya a Pic with tape measure.

 

The HH100 on the Sears Custom has a 1" thick block of Cast Iron under the block for a spacer.I'll get you measurements with the spacer and without.


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#8 EricFromPa ONLINE  

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Posted May 24, 2015 - 04:33 PM

Hey here ya go lol sorry it took so long.

 

From top of the crank to the bottom of the Spacer on my HH100 is exactly 6 inches.I can't really tell how thick the spacer is but here's some pics.

 

100_1350.JPG

 

Pic of the Spacer under the engine.It's really hard to get an accurate measurement because of the lack of space in there lol.But I think it is 3/4 of an inch.I originally thought it was 1".

 

100_1351.JPG

 

Than puts the center of the crank at 4.75 or 4 3/4 inches to the bottom of the block because the crank is 1".

 

6" - .75" - .50" = 4.75 or 4 3/4"

 

 

Don't mind the permatex lol I had to take the side of the engine off when it was still in the tractor do to the connecting rod nuts working loose.I fixed it They will not be working loose again that's for sure.Removed the flat washers and put lock washers and a drop of blue loctite on them.


Edited by EricFromPa, May 24, 2015 - 04:45 PM.

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#9 chieffan ONLINE  

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Posted May 25, 2015 - 07:48 AM

My Engine has 1" tube type spacers that the mounting bolt runs through under the engine.   A 35" belt is just right and works great.  I used a link belt to get the length.  Each link is right at 1" so by adding or removing a link gets the length I need.  I always round down, not up,  as the link belt does not sit down in the pulley as deep as a regular V belt does.






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