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This coming week I plan on starting an engine overhaul on my HH120 which is mounted on a 1972 Massey 12H. I have not taken it apart yet but I believe my connecting rod has broken off the piston head. I have looked on eBay for a rebuild kit. I have found many and I am wondering if the attached link is a good set to buy. I know the piston head won't fit my HH120 but everything else should fit correct?

http://www.ebay.com/itm/fits-Tecumseh-HH100-HH140-engine-rebuild-kit/141022292023?_trksid=p2045573.m2042&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D27%26meid%3D1005437344928674378%26pid%3D100033%26prg%3D1011%26rk%3D1%26rkt%3D4%26sd%3D141022292023%26
 

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Take it apart and mic the cylinder and crank before you even think about parts. That set said standard size only. If this is going to be your first rebuild pick an easier and cheaper engine. Pick a cheap engine to prctice on. Try doing a swamp yankee overhaul where you disassemble, hone, lap, polish, clean and reassemble the engine with new gaskets and seals. IF it wasn't too warn, it will run pretty good. Good Luck, Rick
 

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Take it apart and mic the cylinder and crank before you even think about parts. That set said standard size only. If this is going to be your first rebuild pick an easier and cheaper engine. Pick a cheap engine to prctice on. Try doing a swamp yankee overhaul where you disassemble, hone, lap, polish, clean and reassemble the engine with new gaskets and seals. IF it wasn't too warn, it will run pretty good. Good Luck, Rick
Thats right always mic the cylinder before buying the piston, but in this case he knows he cant use the piston and is wondering if the rest of the kit will work. I'm not sure, maybe some of you Tecumseh pros can tell him
 

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Thats right always mic the cylinder before buying the piston, but in this case he knows he cant use the piston and is wondering if the rest of the kit will work. I'm not sure, maybe some of you Tecumseh pros can tell him
I'm not sure what is meant by the piston head. Is it the piston or the cylinder head? I mic the cylinder first to deterrmine whether to hone or bore. I've still never used my boring bar in the 34 years that I've had it. Good Luck, Rick
 

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What do you mean by mic?
That is short for micrometer. It means to measure the diameter of the object in question to an accuracy of 0.001". A standard 1" mic can do the crank but you need an inside mic and the knowledge to measure the cylinder bore. Good Luck, Rick

When using measuring instruments you have to use a light touch or you can damage the instrument.
 

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Discussion Starter · #9 ·
What determines oversized and undersized?
 

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When the cylinder wears too much you need to bore it larger so you need an oversize piston.

When the crank wears too much you need to machine it down to a smaller dia, so you need an undersize rod.

Some rods can be re-sized to fit your crank at a machine shop.
 

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Discussion Starter · #11 ·
So how would I know what to do? Simply measure?
 

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In theory yes.

I have put a few of standard size kits in Tecumesh engines and they do run better but some are still a little noisy.

If you want a like new, really good quiet running engine go to a machine shop, they have the tools an know how to do it better than I can.
 

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What determines oversized and undersized?
There are standard sizes for the components of a particular engine. I suggest that you download the Repairmans Manual for Briggs and Stratton engines. It has several excellant excellant sections on engine troubleshooting and rebuilding. I will post this and then try to add the link. Tecumseh may have a good manual too. You can download three free manuals per day. Good Luck, Rick

Take some time to read this manual for general knowledge http://gardentractortalk.com/forums/files/file/2802-briggs-stratton-repairman-manual/

This manual may be for your specific engine http://gardentractortalk.com/forums/files/file/1742-hh100-hh120-overhaul/ There is a section that shows the standard sizes and specifications of components.

I suggest that if you have never done something like this before find a cheap engine to learn on. I pickup free lawnmowers at the transfer station. They are perfect for learning on.
 

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Wow! I just had to look that one up. :thumbs:

Sure enough, there's a Wikipedia page for "swamp yankee"
When I got out of the Army and moved to NE CT in 79, one of my neighbors told me that the cheapest guys around were "swamp yankees". I decided to make that my goal. Previously my top sergeant and platoon sergeant had called me the cheapest LT in the Army. The tradition continues. I can generally get more life out of machines than most people. Now I will have to look it up.

This was interesting http://swampyankees.com/swamp-history.asp

I define it as stubborn to my beliefs. Part of that is the old USCG mantra of: nobody dies on my watch and the USACE ideal: try, adapt and make do.
 

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That's one of the things I love about the internet, you get exposed to all the regional sayings. The Wiki page makes it sound like that's pretty much an eastern CT/RI saying. I was just in eastern CT last week. I could have slipped that one into the conversation and they would've thought I was a local. :D
 
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That's one of the things I love about the internet, you get exposed to all the regional sayings. The Wiki page makes it sound like that's pretty much an eastern CT/RI saying. I was just in eastern CT last week. I could have slipped that one into the conversation and they would've thought I was a local. :D
Jim, no way.. The "Yunz", "hoagie", "crick", "chipped ham", "stickybuns",
"pierogies" and "pocketbook" in the surrounding sentences would've given you away... Besides, we've talked and you pronounce your "r"'s very well...

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Take it apart and mic the cylinder and crank before you even think about parts. That set said standard size only. If this is going to be your first rebuild pick an easier and cheaper engine. Pick a cheap engine to prctice on. Try doing a swamp yankee overhaul where you disassemble, hone, lap, polish, clean and reassemble the engine with new gaskets and seals. IF it wasn't too warn, it will run pretty good. Good Luck, Rick
Only problem with the swamp yankee method is that you invest time and effort in a project and are rolling the dice on the results., but hey, its worked before, for awhile, then comes the posting 3-6 months later, "need to rebuild engine", all previous time and effort is wasted and sometimes the engine is a goner. I like the guy on this forum whose signature reads "Murphy was an optimist" man no truer words were spoken, for when you try and cut corners/save money it usually ends up costing more in the end. And as I preach this, I've done it before, and may be guilty of it again, but this forum is about sharing information and experience in order to hep you as best as we can. You need to really understand the tolerances/specifications and basic engine service before tackling this project, but with all the manuals and members with experience to help you, you'll be able to do. Just remember it always easier to ask a stupid question tha it is to fix a stupid mistake. Good Luck
 

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Discussion Starter · #20 ·
Only problem with the swamp yankee method is that you invest time and effort in a project and are rolling the dice on the results., but hey, its worked before, for awhile, then comes the posting 3-6 months later, "need to rebuild engine", all previous time and effort is wasted and sometimes the engine is a goner. I like the guy on this forum whose signature reads "Murphy was an optimist" man no truer words were spoken, for when you try and cut corners/save money it usually ends up costing more in the end. And as I preach this, I've done it before, and may be guilty of it again, but this forum is about sharing information and experience in order to hep you as best as we can. You need to really understand the tolerances/specifications and basic engine service before tackling this project, but with all the manuals and members with experience to help you, you'll be able to do. Just remember it always easier to ask a stupid question tha it is to fix a stupid mistake. Good Luck
Thats' why I'm asking the questions before I just take it apart. I want to do it once and not have a worry for a long time.
 
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