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To change or not to change...that is the question.

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Patrick Martin

05-17-2007 19:42:02

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Welp guys....I can't find a cheaper set of piston rings for my 100. Sure I can buy one set of rings for a particular car and use the compression rings and another set of rings for another and use the oil rings then I'd have a set but for the price I'd be spending the same and have leftovers I can't use.

Go figure huh? each set is cheaper and the combined cost is still $15 less than what they are asking for the C-123 set but they won't sell the complete set for less than $70-$90. Somethings up there wouldn't you beleive?....

Anyway....my old rings don't look too bad actually. Take a look y'all :)

http://img.photobucket.com/albums/v425/EZFEED/Cam015.jpg
http://img.photobucket.com/albums/v425/EZFEED/Cam014.jpg
http://img.photobucket.com/albums/v425/EZFEED/Cam010.jpg

If it were one of my antique cars I'd change these in a heartbeat but then again I have never paid more than $30 for a set of rings before. I know I sound like a cheapskate here but I'm trying to save a little cash plus these parts look really good. For such a low RPM engine like this I just can't say for sure however. :)

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tractorsam

05-19-2007 11:30:01

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

I just put a set of rings in my Super C that someone has overbored to 3.25" and they were just over $10 (Canadian) per hole plus $20 shipping. Although they were ordered through my local CaseIH dealer I"m pretty sure they originated from Deere"s aftermarket Parts Country. Hope this helps, tractorsam

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GordoSD

05-18-2007 07:35:07

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

Patrick, Check your camera and manual. There should be a 'macro' setting so you can sharpen up those closeups.

Gordo

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Randy S.E.-MN

05-18-2007 05:02:52

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

Patrick...are you the one who lined up all the ring gaps? If that's how you pulled them out of the block, well...THERE'S YOUR PROBLEM!! The combustion pressure now has a straight shot down to the crankcase. Those ring gaps are supposed to be 180 degrees apart so any combustion leakage past the top ring has to take "long path" through the second ring and gap. The oil ring are not designed to hold against compression.

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Ron in Nebr

05-18-2007 05:19:55

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Re: To change or not to change...that is the quest in reply to Randy S.E.-MN, 05-18-2007 05:02:52

Unless those rings are pinned in place on the piston so they can't rotate like some older motorcycle engines are, then the way you line up the ring gaps when ya put them in will have NO bearing on how they're lined up when ya pull them back out. Rings are designed to rotate in their grooves as the engine runs to help keep carbon cleaned out of the grooves. My guess is he just lined em up to inspect them and snapped the pics.

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RustyFarmall

05-18-2007 04:01:41

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

The price of steel is going higher and higher. The price of fuel and transportation to get those parts from the factory to the parts house is getting more and more expensive. This all adds up to the price of the restoration and repair parts that we need going higher and higher. There is no such thing as inexpensive parts anymore.

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Janicholson

05-17-2007 20:14:15

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

Put the rings into the cylinder they go into just at the top of the wear. (where the top ring stops. (be sure that they are right side up, and square in the bore. Measure the end gap of the rings (one at a time) if they are more than 50% larger than specified for new, the rings are toast.\
Google piston rings, Ill bet you can find a source that will sell you the pieces you need. JimN

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K.B.-826

05-17-2007 19:46:29

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 19:42:02

Why did you tear it down?

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Patrick Martin

05-17-2007 20:07:00

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Re: To change or not to change...that is the quest in reply to K.B.-826, 05-17-2007 19:46:29

OOOOO OOH!!!!! Crap, I forgot to say why I did that! :-0

the reason is because I was getting combustion pressure into my crankcase and would be taking the head off plus I wanted to change the main and rod bearings too. I think I had a peice of sand or something from blasing get into the oil system and it scored the center main bearing pretty bad. I cleaned the oil galleys again and polished the journal with emory paper and slapped the new mains and caps back on.

Tomorrow I'm checking the valves to see if I didn't lap one just right and will probably just regrind the seats again. The original seats were so eroded that I had them machine and install new valve seats and they were pretty tough so it's possible I didn't get one just right.

The little tracotr runs great. It will fire right up with just a bump of the starter. The problem was that I was getting a "chug" of exhause smoke that was in time with what was coming out of the exhaust pipe. I could pull the dipstick at low idle and get covered with oil from the pressure trapped in the crankcase.

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Andy Martin

05-18-2007 06:14:10

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 20:07:00

Don't pull the dip stick on an A or 100 that is running, it will throw oil all over you.

The place to check for crankcase pressure is at the breather on the valve cover.

Set the rings right and put them back in and see if you still have the exhaust oil. Are you sure it is not a valve sticking and needs to be broken in?

The low speed engine is very forgiving, but your bearing problem is why I just stay away from sand blasting.

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Janicholson

05-17-2007 20:21:19

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Re: To change or not to change...that is the quest in reply to Patrick Martin, 05-17-2007 20:07:00

It is difficult for compression pressure to get into the crankcase through the head. Unless it is vrey broken. Cracked heads usually put compression into the coolant, or coolant into the oil. Bad rings, however are very likely the real cause of excess blowby. JimN

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Patrick Martin

05-17-2007 20:29:08

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Re: To change or not to change...that is the quest in reply to Janicholson, 05-17-2007 20:21:19

That's what I thought too Janicholson. That's why I faulted the rings but then after pulling them it just amazes me that these are even bad given how crisp they feel.

I love tearing into this little engine so I don't mind downing it again. I just don't like doing the same repair twice. :)

The two M's I just bought are going to be bears though. Those suckers are HEAVY!!!!!

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