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Tecumseh Serial Experts

tecumseh motor

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#1 gjh73 OFFLINE  

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Posted June 29, 2020 - 02:55 PM

Attached is the photo of my Tecumseh HM80 motor.  This is from 1977 and was used by the previous owner to repower my MF8 tractor.

 

The serial number reads: HM80-EXE-16614 SER-7243X.  I believe this was manufactured on the 243rd day of 1977.

 

It was suggested by someone that it may have been an experimental design.

 

Any Tecumseh experts know how to read this serial number and tie it to a series so that I can get the correct parts drawing?

 

Thank you for any help.



#2 gjh73 OFFLINE  

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Posted June 29, 2020 - 02:59 PM

Tecumseh Serial.jpg



#3 EricFromPa OFFLINE  

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Posted June 30, 2020 - 01:00 AM

If that date is correct it very well could be an experimental. I forget when they started building the HM but it could be as early as 77.

 

1st number of the Serial is the year. 7 could be 67,77 or 87 and 243rd day of that year. They definitely didn't build the HM series back in the 1960s so Most likely built in August 31 1977. 

 

The letter suffix X would be the 24th engine made that day. They never made more than 26 units of each spec code per day. Hard to tell if they would of made a full run of 26 experimental engines or not but it sure looks like they did.

 

Does it have Points under the flywheel like the older HH40-HH70? or the large solid state ignition module like the HH80 HH100 and HH120? or solid state like the newer aluminum block HMSK80 and HMSK100?

 

 

I'm no tecumseh expert but I sure do seem to work on ALOT of them lol. 


Edited by EricFromPa, June 30, 2020 - 08:09 AM.


#4 gjh73 OFFLINE  

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Posted June 30, 2020 - 08:10 AM

Thank you for the response.  It's definitely a 1977 since the tractor is a 1974 and I bought it from the guy who repowered it in 1981.  I haven't taken it apart so I cannot comment on the points but I may try that next.

 

It seems to be a solid motor.  I used it from 1982 till 1998.  Fogged it and let it sit till 2019 and it started and ran without much prompting.  At its age you can imagine things start failing and I would like to try to best tie it to a parts diagram.  For example, the recoil rope broke so I needed to also replace the tired dog springs too.  I guessed at what part number they are and got lucky with that one but I would sure like a better degree of confidence in what parts list to follow.

 

Thanks again






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