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Tecumseh Hh120 .155 Oil Ring End Gap...holy Smokes!


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#1 classic ONLINE  

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Posted April 23, 2014 - 08:06 AM

So I tore down the HH120 on the 68' Sears Suburban I picked up over the winter. The engine actually ran well, but smoked a bit under load. The end gaps on the new rings didn't exceed .017 so I'm installing a new std. Piston and ring set. I bought five NOS Tecumseh std. Piston assemblies from ebay for 49 bucks plus shipping. There were some water stains on the pistons, but nothing to worry about. Only one of the pistons had a lot of staining. Anyway, I decided to pull the old rings from the old piston since they looked pretty worn. The top compression ring end gap was .030, the second compression ring end gap was .076, and the oil ring end gap had a whopping .155 end gap! I figured that I would just post some pics to show how worn rings can get over time. Here is a pic of the old oil ring in the bore and the new oil ring in the bore.

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#2 HowardsMF155 OFFLINE  

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Posted April 23, 2014 - 09:18 AM

Tell me more about what you are doing with this rebuild.  I've got some Tec engines in my beloved Masseys that smoke on start and burn a bit of oil.  Are you putting standard sizes back in on everything?  Honing the cylinder, or boring out oversize?

 

Thanks

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#3 classic ONLINE  

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Posted April 23, 2014 - 09:52 AM

Howard, on this engine I'll be lightly honing the cylinder, replacing the piston assembly, connecting rod, and lapping the valves. You will have to measure your crank journal and check the condition of the bore in your engines. I was lucky and was able to go with a std. rod, std. piston, and std. rings on this one. I have another HH120 that needs the crank turned .010 and the cylinder bored .010. I'm also having the valve guides reamed to except oversize valves and on this engine. I finally found all of the parts I need, so It's time to get the machine work done.

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Edited by classic, April 23, 2014 - 10:39 AM.

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#4 MH81 ONLINE  

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Posted April 23, 2014 - 11:24 AM

I hear ya. It's amazing how bad rings can get and still run.
post-802-0-15193300-1355280520.jpg

Old.......Broken New
........Old
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#5 classic ONLINE  

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Posted April 23, 2014 - 04:29 PM

Now those are some worn rings MH, WOW!
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#6 Bolens 1000 ONLINE  

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Posted April 23, 2014 - 04:31 PM

I cant say I have ever seen rings in that bad of shape Alan!

Wow!


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#7 sodisr OFFLINE  

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Posted April 24, 2014 - 09:31 AM

Hey   Classic...

 

  How in the world can any ring wear at the ends..???

 

  I would suspect that the ring gap was like that when installed...possibly wrong rings to begin with,,and someone  ( made do ) with what they had ,,or  bought..



#8 Bolens 1000 ONLINE  

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Posted April 24, 2014 - 09:34 AM

Hey   Classic...

 

  How in the world can any ring wear at the ends..???

 

  I would suspect that the ring gap was like that when installed...possibly wrong rings to begin with,,and someone  ( made do ) with what they had ,,or  bought..

 

They dont wear on the ends, the end gap increases due to the rings constantly rubbing the cylinder walls for 30+ years. As the rings wear they just expand which causes excessive ring end gap.


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#9 sodisr OFFLINE  

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Posted April 24, 2014 - 09:55 AM

O K...  I see it now  DR  B.

 

   That make sense..        :wallbanging:            Thanks for clearing my head..



#10 classic ONLINE  

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Posted April 28, 2014 - 08:06 PM

Thanks for answering the question regarding the ring wear DR.B. I've been busy raking and hauling leaves and hunting down more parts for the HH120 rebuild. I noticed a haze on the Timken main bearing races, so I'm replacing the bearings and races while I'm at it. An NOS crankshaft gear is on the way, also. This started out as a rering job on the 68' Suburban, but I just picked up the paint and the decals came in. I might as well just restore the thing.
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