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Farmall & IHC Tractors Discussion Forum
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766 gas -valve or ring

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waterlooboy

11-24-2007 18:48:06




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766 with recent head rebuild started to miss on one cylinder,extreme smoking from vent pipe and tapping noise. smoke and noise gone now;miss still there.was using 10 weight motor oil at time.shop suggesting broken ring,cylinders scored at time of valve job;thought it would hold out a bit longer than 100 hrs.how to test if rebuild failure or ring problem.




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the tractor vet

11-25-2007 06:46:09




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 Re: 766 gas -valve or ring in reply to waterlooboy, 11-24-2007 18:48:06  
Well first off ya should ONLY RUN the low ash oil in the 30 weight and second ya HAVE TO run the 93 octane gas. So if none of the above has been used ya had pull the head and take a look see as you may have ate another valve due to the wrong engine oil being used or scored one or more sleeves due to the lack of the correct gas. or impropper ing. timing.



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waterlooboy

11-25-2007 17:37:46




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 Re: 766 gas -valve or ring in reply to the tractor vet, 11-25-2007 06:46:09  
was running 30 weight till it got cold,then switched to 10. tractor was parked in open ,no power for block heater, 10 was appropreate. fuel the same as always.not as interested in the why it happened;more in what has failed.



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