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Looking for advice: Rings


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#1 MH81 ONLINE  

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Posted December 03, 2010 - 08:49 PM

Had the piston out of my son's MF10. (HH100) Took a look at the rings as the piston came out. There was about an 1/8th inch between the ends of the rings. I think that's a little much, so here's the question... how best to figure what rings to buy? :confuse:

I have a set of digital calipers, but they will only reach in 1/2". On the up side, there's no lip at the top that I can see/feel. I almost get the impression that someone was in here & honed out the cylinder but didn't change the rings.
:wallbanging:

Is there a good source for replacement rings, or should I get original Tec rings from one of the suppliers mentioned in previous posts (Napa, psep, etc)?

Thanks in advance for the opinions - Alan:worshippy1:

#2 mikebramel OFFLINE  

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Posted December 03, 2010 - 09:20 PM

Tecumseh HH100 piston ring set (STD) "3 - eBay (item 320616533254 end time Dec-12-10 09:29:09 PST)

if you need oversize the only places i found that have them is partstree.com and psep.biz

#3 smatt26 OFFLINE  

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Posted December 04, 2010 - 09:05 PM

Here is a good parts source for ya: Tecumseh Engine Parts

#4 olcowhand OFFLINE  

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Posted December 04, 2010 - 10:13 PM

You could use telescopic cylinder gauges, then use the caliper on them to measure. But unless you may need the gauges again, I would just take the block to a shop & have it mic'd. http://www.harborfre...e-set-5649.html
mit3202752n.eps_large.jpg

Edited by olcowhand, December 04, 2010 - 10:19 PM.


#5 tweidman OFFLINE  

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Posted December 04, 2010 - 11:19 PM

You could use telescopic cylinder gauges, then use the caliper on them to measure.


That is how I measured my bore, luckily my next door neighboor is a car nut and had a set to loan me....

#6 olcowhand OFFLINE  

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Posted December 05, 2010 - 08:49 AM

I have a set of them, and they work very well. Mine are the Harbor Freight jobbies.

#7 MH81 ONLINE  

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Posted December 05, 2010 - 09:52 AM

UPDATE:

Last night I took a set of pincher-type calipers and got my best measurement, did it 10 times. (last 5 because I was confused). The original bore is listed as 3.3125, I got measurements ranging from (variances due to low tech devices & human error I'm sure) 3.3115 to 3.319. I averaged it out & only got 3 thousandths over.

I also put the rings in from the 2nd piston & had a smaller gap between the ends. This was 47 thousandths.

He's not going to be competition plowing or hooking onto a sled, but I want it to run right. Are these tollerences close enough or should I get a new set of rings?

Thanks for all your help guys!!

#8 DougT OFFLINE  

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Posted December 05, 2010 - 10:12 AM

If your talking a .047 end gap with teh ring in the cylinder, that's too much. I don't know what the factory spec is but I'd think with a 3 in bore you wouldn't want to go much over .010.
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#9 olcowhand OFFLINE  

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Posted December 05, 2010 - 10:15 AM

Ring end gap range is .010 to .020. Your clearance is waaay too wide & definitely needs new ring set.
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#10 MH81 ONLINE  

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Posted December 05, 2010 - 12:16 PM

BTW, forgot to ask & the manual not real clear... when timing the cam/crank... do the marks line up (cut tooth & mark)? I remember that some of the tec engines had the mark off a couple of teeth, but can't remember which way & which ones. I'll have the complete model# tonight, forgot to bring home the paper. :blush2:

#11 MH81 ONLINE  

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Posted December 12, 2010 - 12:22 AM

I put this information in the TO your tractor, but we found a set of rings for it. I found them 20 minutes away... original NOS, also a NOS head gasket, will pick them up next week. Tried Saturday, but just ran outta day

Edited by MH81, December 12, 2010 - 10:11 AM.





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