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Rebuild/Replace Smoky OH140 Tecumseh?


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19 replies to this topic

#16 Bolens 1000 ONLINE  

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Posted May 22, 2016 - 03:56 PM

 The bore for a OH140 is the same as the HH100.

 

Without pulling the parts list , are you sure that is right? How can the bores be the same when one is 14HP and the other is 10HP?


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#17 Sawdust OFFLINE  

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Posted May 22, 2016 - 04:15 PM

They both have a 3 3/8th" bore.
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#18 DH1 ONLINE  

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Posted May 22, 2016 - 04:47 PM

Without pulling the parts list , are you sure that is right? How can the bores be the same when one is 14HP and the other is 10HP?

 

Bore and stroke are the same for HH100 and OH140

HH100 is flat head =10hp

OH140 is overhead valve = 14hp


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#19 MFDAC OFFLINE  

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Posted May 22, 2016 - 07:26 PM

Usually a tapered bore us bigger at the top of the cylinder.

It could be but I have always seen wear taper at the lower part of the cylinder, never at the top. Just ring wear at the top, causing the need to ream the ridge sometimes. The sideways thrust from the connecting rod angle causes the piston to be pushed sideways for a bit at the bottom until the rod straightens out towards the top of the bore going up to TDC. At TDC the rod is straight with the bore. Just my experience from working with race engines back in the day, and choosing used blocks for the machining.

 

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#20 TAHOE OFFLINE  

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Posted May 23, 2016 - 07:07 AM

 The bore for a OH140 is the same as the HH100.

 

guess I missed that one.....

 

 

 

HH80.jpg






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