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Farmall & IHC Tractors Discussion Forum
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706- puddles under the plugs

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IndianaScott

03-08-2006 05:28:24




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I have a 1964 Farmall 706 Gas and i had the engine rebuilt by a IH dealer in 1998. I have put maybe 150 hours on the tractor sence the rebuild but for sometime i"ve noticed oil around the spark plugs. Am i missing something or is this just bad news?




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Wayne Swenson

03-08-2006 09:20:42




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 05:28:24  
Oil in puddles leads me to think that the valve cover gasket is leaking. That amount of oil should not come past the sparkplug threads/gasket unless the cylinder was literally "drowning" in oil.
To verify, remove the sparkplugs & THOUROUGHLY clean the gasket seating surface. Dig out all the old gaskets someone else left behind. Use the end of a smaller mill file (it is hard & sharp) to dig & scratch around to get down to bare metal. Find the correct spark plug thread tap & clean the threads in the head; they get carboned up & you think the plug is tightened properly but it is not sealed at the gasket. If you do not have a tap, take an old sparkplug & hacksaw 3-4 grooves at a right angle to the the threads. take the old gasket off & you now have your own tap!

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the tractor vet

03-08-2006 05:38:49




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 05:28:24  
Well that is not good , but it keeps the threads lubed on the plugs . Just how much oil is it usen . Don't know how hard ya work it and with only a 150 hours on the engine you are not working it much. It could be that you never got the rings to seat and now the liners are glazed over . Or it could be that they did not check to see if the bore of the block was out of round and just slaped in a set of sleeves and when ya do that the liners are out of round . And the bad part is they don't care as they got your money . This is one of the reasons that when i do a 263 i have it bored to take the 291 up date sleeves that way i know that the block is now round and no boreing and re slevenen and bore again to take the 263 sleeve .There is a bunch more to doing a super good job of rebuilding then just slapen in sleeves and pistons .

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Bob

03-08-2006 05:57:56




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 05:38:49  
No matter how much oil it does or doesn't use, oil should not be oozing out past the plugs, unless there is s spark plug-to-head sealing "issue".



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the tractor vet

03-08-2006 06:23:44




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 Re: 706- puddles under the plugs in reply to Bob, 03-08-2006 05:57:56  
Well you can only tighten the plug dow so tight and with a max . of toqure of 25 ft. lbs if it is pushing oil past the rings it is going to weep past the seal with 125 or more PSi and when the engine fires the pressure goes way beyond those figures plan and simple so it is pushing oil past the rings and i do not care how much you try and tighten the plug or how clean the area is it is still going to weep.

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IndianaScott

03-08-2006 06:27:38




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 06:23:44  
I was affraid you were going to say that!



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the tractor vet

03-08-2006 06:41:18




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 06:27:38  
One thing about me i tell it like it is , it may not be what someone want to hear but it is the truth and i do know my Binders and what makes them tick.



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Bob

03-08-2006 06:59:54




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 06:41:18  
I've never had a gas 706, only a diesel. However, we ran a couple of gas 503 combines hot and heavy, for YEARS with the 282 gassers. At one time or another, both burned oil bad enough that we OH'd them, and I don't recall them EVER slopping oil out past the spark plugs, even though they would oil-foul the plugs in a half-day or so.

I don't think it is EVER normal for oil or combustion products to leak past properly installed spark plugs. That's why they have a gasket!

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the tractor vet

03-08-2006 07:14:37




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 Re: 706- puddles under the plugs in reply to Bob, 03-08-2006 06:59:54  
Yes that is why they have a gskt but you do not gt much sealing with only 25 ft.LBS and on the combine engine it is running either at idea or at full throttel and working and the oil is burning where as he is not working the engine just running a brush hog with a 706 even if it is and 8 foot or a 10 foot unless he is in real tall grass or brushand only for short bursts and the other thing is his thermostat may not be working and letting the engine get to operating temp so there for his oil is not burning but being pumped . A good running 706 gasser working like it should should burn about 1 to 2 qts a day under a plow it is when they start using three to four a day ya got a real problem. . or when ya can keep the skeeters away in the evening from the blow by .

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IndianaScott

03-08-2006 07:50:16




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 07:14:37  
When i bought the tractor i had to have the head milled .010 so it would seal the head gasket. is this common or does it mean that it got very very hot? Sence then i replaced the thermastate, radiator, temp gauge cluster and water pump.



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the tractor vet

03-08-2006 09:01:50




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 07:50:16  
No this is common but i bet ya that they never checked the block . Ya should see how bad the blocks on 806 and 1206's warp that is why and again that ya have to check on them 99% of the time ya have to bore the block and install the .010 oversize sleeves just get it stright and round and the heads have to be done then ya got to get the valves set in the head just wright these things are getting old and blocks and heads warp even the line bore needs to be trued . When we did Eugene's it got everything . even a custom balance job sure did smoothe that one out and gain some extra power . But maybe we got to carried away on that with the C Cing of the head the balance job and rebuilding and blueprinting of the cam .Hey it is only money .

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IndianaScott

03-08-2006 06:08:03




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 Re: 706- puddles under the plugs in reply to Bob, 03-08-2006 05:57:56  
I'll check the seal on the plugs, Thanks



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IndianaScott

03-08-2006 05:49:23




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 05:38:49  
I just use it to bush hog. The tractor doesn't really smoke or use any oil, its just enough to bug a guy.



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the tractor vet

03-08-2006 06:38:22




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 05:49:23  
Then you never got the rings to seat after rebuild . The first 30 hours is when all this takes place and brush hoggen you ran the engine at or close to PTO speed and it should have benn on varyen loads and speed . Myself when i first lite a new engine off i like to run the first 6-8 hours either on a Dyno or light to modert work varying the engine RPM and load and at times to full power and load for a short peirod this put a load on the rings as compression blowby pushes the rings out into the cylinder walls and makes them sorta bit in then after the first 10 hours change oil and filters and start worken it a bit harder til it hit the 30 hour mark with an other oil change at 20 hours after the 30hours then anything goes . On my one buddy's 706 it has 2100 hours on it since overhaul and other then the scored piston from the wrong gas last spring it does not have this probelm now Vernons with around 4200 hours on his it is starting to weep oil around the pulgs and we were just talken about that last monthe along with the selfinflickted chiped tooth on reverse because he dropped the park lock while it was still moving as to fix the tractor or scrap it .

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IndianaScott

03-08-2006 06:50:17




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 Re: 706- puddles under the plugs in reply to the tractor vet, 03-08-2006 06:38:22  
I've got a chiped tooth also, had to take off the three point top link plate and found the tooth with a magnet in the very lowest point in the rearend of the tractor. now there's a click sound when your in reverse 3rd gear.



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the tractor vet

03-08-2006 07:03:22




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 06:50:17  
Oh they are sooooo o much fun to fix major tear down with a split lots of correct words to be used and some pinched fingers parts cost around 6-700 bucks labor priceless. done a few it teaches one to make sure that the tractor is completely stoped and out of gear before ya drop the park lock and take your foot off the clutch .



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the tractor vet

03-08-2006 07:03:21




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 06:50:17  
Oh they are sooooo o much fun to fix major tear down with a split lots of correct words to be used and some pinched fingers parts cost around 6-700 bucks labor priceless. done a few it teaches one to make sure that the tractor is completely stoped and out of gear before ya drop the park lock and take your foot off the clutch .



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Bob

03-08-2006 05:34:19




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 Re: 706- puddles under the plugs in reply to IndianaScott, 03-08-2006 05:28:24  
Check to be sure the gaskets are on the spark plugs, and that the head is clean at the sealing surface. Then, tighten the spark plugs properly.



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