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Farmall & IHC Tractors Discussion Forum
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can a guy just ring one piston?

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caseyc

01-10-2005 18:50:52




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well as some of ya might remember i put a head gasket in my 706G in dec. of '03. had the head all done too!! a week before x-mas '04 i was cleaning up some sh!t out of the barn and it slowly started to run kinda funny. runs fine at idle but under load it was missing. finally got around to checking it tonight. 1-2-3-4-6 all have 100-115lbs compression. #5 has 50lbs! squirt some oil in the hole and i get 80#. try one more time and i get 90# can i ring just one cylinder? the tractor will see very little work now as i have allen's 766:>) maybe 100 hours a year. just curious what allya'll think???

casey in SD

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lee

01-11-2005 07:44:12




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
further investigation required. This could be just a bad head gasket.



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captaink

01-11-2005 07:38:08




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
In theory, you can however, does the spark plug show signs of oil consumption? Have you checked into the cost of rings for just one piston? Doing the air check on all the cylinders will help you discover the condition of the rest of the engine and you can go from there. I have noticed that some times purchasing one cylinder doesn’t save a whole lot of money when compared to a full set. Compare what you are saving (you will need a full set of gaskets etc) to what additional money it will cost you. Also, as Allen mentioned, how is the oil pressure? You might find that you need new bearings on the crank also. Yes, the list (and expense) can go on and on until you get everything fixed. I’m also curious as to why one cylinder would have bad rings as usually when you have a cylinder go down like that it is a burned valve. I suppose it could be broken or stuck rings on that piston, but then I would be curious and check the others too.

Just some thoughts…

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chris Lnk NE

01-11-2005 06:36:01




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
Dont forget that seating new rings requires honing the cylinder(s).



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gene b

01-11-2005 04:11:01




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
Why not just for light use would probably last forever. If you replace all of them then there is the crank and then where is the end it is always easy to spend someone elses money.



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jayw

01-11-2005 04:07:13




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
casey Why would ya want too your allready there might as well do it right and you dont lose no sleep months down the road wishing you had



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Josh in Indiana

01-10-2005 21:30:19




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
We did it with one of the pistons in a 92 series Detroit once. That motor is still going although if dad had to do it over again he would have probably done them all. It has also been my experience that it will probably need sleves as well. Did a ring job for a guy on a jd 4010 and the thing ran and smoked worse after the new rings were installed in the old sleeves. It really depends what your gonna be using the tractor for. Just throwin it out there for ya.

Good Luck and God bless

Josh in Indiana

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Allan in NE

01-10-2005 19:38:17




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
Casey, Casey, Casey..... ..

Golden Rule of Engines #11:

Tighten the top and the bottom will fail unless it is also tightened.

Don't make me have to come up there!!!! :>)

Allan



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Ron in Nebr

01-10-2005 19:36:20




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
Before you tear into it, you might want to run an air check on the cylinder to make sure exactly what the problem is. You might know how to do this, but for those who dont: Hook an air hose from a compressor to pump air into the cylinder(make sure both valves are closed). You can do this with an adaptor(the adaptor from my compression guage fits my air hose too) or if you don't have one and are reasonably handy at fabricating you can make one by knocking the center out of an old spark plug and attaching a male air hose coupler to it. Then you can listen with a hose to see where the air's leaking- if you hear it coming from the dipstick hole or oil filler cap, then yep, it's rings/piston. If it's coming out the muffler it's an exhaust valve, and out the carb air intake naturally it's an intake valve. Air or bubbles in the cooling system indicate a head gasket or cracked head/block. Most mechanics will automatically do an air check when they come up with a low compression reading on a cylinder.

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CNKS

01-10-2005 19:03:06




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
A lot of poeple have done that, apparently with no detrimental effects that they knew about. But, isn't the new compression of your 706 about 140? If so you will have one cylinder with 140 lbs and one or more with 100 lbs. Using the 10% rule, none should be less than 10% of the highest, or some variation of that. All of the cylinders are getting low on compression, and you have to pull the head, drop the pan, etc. I know you want to save money, but--?

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Sloroll

01-10-2005 19:01:24




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 Re: can a guy just ring one piston? in reply to caseyc, 01-10-2005 18:50:52  
Do it in aircraft engines all the time. Seeing as it is torn down tough.. It really isn't that much to do them all once you are into it.



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