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Going to tear down the 706 gas
:

advice appreciated

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andy

09-08-2002 21:31:44




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OK ..... need to have my 706 gas soon for fall harvest. So, this week I am going to pull the head and have it gone through. Will deglazing the cylinders and installing new rings solve the oil buring? The engine does not have that many hours on it since it had new sleeves and pistons. Probably was pulled hard on 40 acres only disking. Did some cultivating and rotary mowing during 5 years. Ran a grain dryer three years. Engine ran great all during this time. Then changed oils and weights and everything went to pot. May or maynot have been the reason. Went from SAE 30 to SAE 14 - 40. Other than that not that many hours. Maybe 250 - 300. Tach cable broke. Surely the sleeves and pistons can not be hurt that much. Presently uses alot of oil and runs on less than 6 cylinders. I think a cylinder is completely down. Valve? I understand these may have not been the most durable engines. Any help will be appreciated as I tear it down and rebuild. What would you do? andy

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AceS

09-09-2002 04:48:10




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 Re: Going to tear down the 706 gas - advice appreciated in reply to andy, 09-08-2002 21:31:44  
If there is not very much ring groove you should be able to just ring it , but the oil you are using could be the broblem. 706 should have a low ash or lo detergent oil like IH #1 gas engine oil.



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andy

09-09-2002 09:33:17




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 Re: Re: Going to tear down the 706 gas - advice appreciated in reply to AceS, 09-09-2002 04:48:10  
I understand the low ash oil recommendation. I DID NOT use low ash oil until I already knew I had a problem. I do believe the low ash oil was to prevent valve problems like sticking in the guide and ash buildup on the seat and valve head. Probably the low ash oil has nothing to do with cylinder wear. I could have built up deposits on the valve and the guides which caused poor seating and eventually burnt the valve(s). Am I right on the function of low ash oil inregards to the valves and seats and probably not the cylinders? I probably will run low ash oil after the repairs are made Thanks andy

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andy - more on 706 problem

09-08-2002 21:49:49




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 Re: Going to tear down the 706 gas - advice appreciated in reply to andy, 09-08-2002 21:31:44  
I ment that I changed to 15-40 oil not 14-40. Did that to reduce oil inventory as my other engines take that. Forgot to mention that I could not keep plugs firing until I went to the hottest plug. Really burns oil. With the oil consumption it surely would have to be rings. Once I found the air intake pipe prior to the air cleaner filled with a nest. Cleaned that and installed new filter. Have been running gasohol (10% ethanol) in the engine. Who knows what is the cause?!?!?!? I just want my 706 back. thanks .... andy

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Larry F

09-08-2002 22:11:17




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 Re: Re: Going to tear down the 706 gas - advice appreciated in reply to andy - more on 706 problem, 09-08-2002 21:49:49  
Andy - I'm not real familiar with the 706 but 250-300 hours on a gas engine with new pistons and sleeves doesn't sound like alot of hours to be burning that much oil. If one set of rings went bad you'd be fouling the plug in that one cylinder but sounds like all of your plugs were fouling and I doubt all six sets of rings went bad at the same time. My suspicion is your problem is in the head. Perhaps bad valve guides (don't know if the 706 uses valve seals). An engine will burn a surprising amount of oil from the top end - had an old Harley that went thru a quart every 1000 miles from the worn valve guides (no seals). Another thought, if the engine wasn't properly broke in when it last had new pistons and sleeves installed that can cause an engine to burn oil prematurely but you likely would have noticed it burning oil all along.

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andy

09-09-2002 09:23:59




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 Re: Re: Re: Going to tear down the 706 gas - advice appreciated in reply to Larry F, 09-08-2002 22:11:17  
You are probably right in saying that all of the cylinders didn't need the hotter plugs as all of them didn't foul. I believe it was two. I am sure that the engine broke in OK. It didn't burn a drop of oil and had great power for so long. Thanks



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Larry F

09-08-2002 22:21:28




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 Re: Re: Re: Going to tear down the 706 gas - advice appreciated in reply to Larry F, 09-08-2002 22:11:17  
Andy - One other thing, I would test the compression on each cylinder. That will tell you alot about the condition of the rings/valves also.



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Mr.T

09-09-2002 13:40:50




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 Re: Re: Re: Re: Going to tear down the 706 gas - advice appreciated in reply to Larry F, 09-08-2002 22:21:28  
Larry F,
I have found it is best to give a leakdown test. That way you can hear and see the readings. If the rings are bad you can hear a roar out the breathercap big time!



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