Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Tecumseh Piston Markings?


  • Please log in to reply
9 replies to this topic

#1 HowardsMF155 OFFLINE  

HowardsMF155

    Tractorholic

  • Senior Member
  • Member No: 4243
  • 2,698 Thanks
  • 2,916 posts
  • Location: Central NC

Posted July 31, 2012 - 06:04 PM

I'm thinking about rebuilding, or at least re ringing, a Tecumseh HH120 engine on my Massey. For those who followed it, this is the one with valve clearance issues and the timing problem. Now that it has been run hard a little with fresh engine oil, it is starting to smoke and use some oil. How do I tell what the current piston size is? I didn't see any markings. Should I assume that an unmarked piston is standard? If they are marked, where should I be looking, center, flywheel side, crankshaft side?

Thanks

#2 JDBrian OFFLINE  

JDBrian

    Super Moderator

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2507
  • 9,574 Thanks
  • 14,136 posts
  • Location: Hubley, Nova Scotia - Canada

Posted July 31, 2012 - 06:52 PM

Not sure on a Tec but it's usually on the top of a Kohler piston. The Tec's I've had apart do not have any markings on the piston but they have all been the original part.
  • HowardsMF155 said thank you

#3 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted July 31, 2012 - 06:55 PM

I have a HH120 with a .30 over piston and it's marked on top.
  • MH81 and HowardsMF155 have said thanks

#4 HowardsMF155 OFFLINE  

HowardsMF155

    Tractorholic

  • Senior Member
  • Member No: 4243
  • 2,698 Thanks
  • 2,916 posts
  • Location: Central NC

Posted July 31, 2012 - 07:03 PM

I have a HH120 with a .30 over piston and it's marked on top.

Do you remember where the marking was? Was it centered, or off to the side, or just can't quite remember?

#5 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted July 31, 2012 - 07:11 PM

It was off to the side, I don't remember if it was marked as .030 or just 30. It was easy to see.
  • HowardsMF155 said thank you

#6 olcowhand OFFLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,589 Thanks
  • 29,831 posts
  • Location: South Central Kentucky

Posted July 31, 2012 - 08:27 PM

All I've ever seen were marked off from center on top of piston. The top of piston is always where the oversize markings are. Some will be marked "STD" for standard, but if no markings at all, it's standard size also.
  • HowardsMF155 said thank you

#7 DH1 OFFLINE  

DH1

    Electric Tractors

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 62
  • 4,585 Thanks
  • 5,295 posts
  • Location: Markham Ontario Canada

Posted July 31, 2012 - 08:32 PM

Here's one that I found
HH 014.jpg
  • Bruce Dorsi and HowardsMF155 have said thanks

#8 DH1 OFFLINE  

DH1

    Electric Tractors

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 62
  • 4,585 Thanks
  • 5,295 posts
  • Location: Markham Ontario Canada

Posted July 31, 2012 - 09:20 PM

Here's another one, standard size of the 10hp HH100.
66 MF10 064.jpg
  • Bruce Dorsi said thank you

#9 HowardsMF155 OFFLINE  

HowardsMF155

    Tractorholic

  • Senior Member
  • Member No: 4243
  • 2,698 Thanks
  • 2,916 posts
  • Location: Central NC

Posted July 31, 2012 - 09:25 PM

Ok, so it looks like if it is marked it will be marked on the crankshaft side. And if no marks are found, then it is standard size. Thanks guys!

#10 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted August 01, 2012 - 04:24 AM

Ok, so it looks like if it is marked it will be marked on the crankshaft side. And if no marks are found, then it is standard size. Thanks guys!


The only time "crankshaft side" would make a difference is if the wrist pin is offset in the piston, in that case the piston would have a notch on one side pointing the proper direction.

Edited by Amigatec, August 01, 2012 - 04:25 AM.





Top