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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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770 unleaded gas additive

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alberta dave

05-18-2020 19:41:36




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I am thinking of firing up my old 770 gasser that has been sitting for a few years. The carb was worn out and the new carb has been on my shelf in a bag for too long. I used to buy a lead substitute additive to put in the gas but only have one bottle left on my shelf. I looked at an auto parts store and all they could offer was octane booster. What do you fellows out there use to keep the valve seats from wearing out when running unleaded gasoline?

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gary66

05-19-2020 14:50:44




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-18-2020 19:41:36  
put some oil in the gas...if it doesn't already get there from age which I'm almost positive it does.



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J. Schwiebert

05-19-2020 05:50:34




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-18-2020 19:41:36  
Your 770 has hard valve seats from the factory.



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alberta dave

05-19-2020 12:25:20




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 Re: 770 unleaded gas additive in reply to J. Schwiebert, 05-19-2020 05:50:34  
I understand that it does have hardened seats. My late brother in law was that last White dealer in our local area and his mechanic rebuilt the engine in the 770 around 1990. It was my father in laws tractor and he bought it new around 1962?? Anyways, I remember my B.I.L telling me to make sure that I always use some lead substitute as the valve seats would wear out. I have a dual hydraulic control and a fuel tank out of an 880 diesel to drop in once I get the 770 back running.

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ss55

05-20-2020 07:31:46




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-19-2020 12:25:20  
A lead additive or a substitute is only needed for older automotive engines (early 1970's and older) and inexpensive small engines that do not have hardened exhaust seats.



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agonair

05-19-2020 05:37:29




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-18-2020 19:41:36  
Back in the 80's, I could buy tetraethyl lead. It came in gallon jugs and we mixed it accordingly. But that was then. Still have the same tractor today and I do not run anything in it. I have an 88 and do run it regularly. No issues.



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P I Pete

05-19-2020 05:37:21




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-18-2020 19:41:36  
I got some from Cenex (local coop) a few years ago.

Pete



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Olliejunkie

05-18-2020 20:32:58




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 Re: 770 unleaded gas additive in reply to alberta dave, 05-18-2020 19:41:36  
I dont run anything but maybe I should. Someone must have a lead substitute still.



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ziffel

05-19-2020 06:34:47




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 Re: 770 unleaded gas additive in reply to Olliejunkie, 05-18-2020 20:32:58  
We still have a local source for leaded fuel for off road use. Check with your farm fuel supplier. Down side is we cannot get it delivered to the farm. Buy some extra cans.



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blackhole49

05-25-2020 05:53:35




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 Re: 770 unleaded gas additive in reply to ziffel, 05-19-2020 06:34:47  
Be interested in knowing where this source is. We can buy ethanol free recreational fuel, but everything is unleaded.



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