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Farmall & IHC Tractors Discussion Forum
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301 LP engine on gasoline

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Dan Dargeloh

02-27-2007 13:58:23




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I have a 806 gas tractor with a tired engine. I also have a UC301 LP engine. It is stock bore with just a very slight amount of bore wear. The pistons are the #392838-R1 slugs rated at 8.7 to l cp ratio. I am going to freshen it up as it has set for awhile. New rings, bearings and a valve job and it will be like new. Will it run on pump gas alright, or should I install a new set of pistons for a regular gas engine? There is a noticeable difference in the depth of the crater on the lp pistons versus the gas pistons. Is there any differece in the combustion chamber volumnes between the gas head and the lp head? I would like to use the lp head if possible, because I believe it would have better valve seats for the unleaded gas we have to use these days. The tractor will be used as a loader tractor, so it has to be dependable and able to handle a load. Also, are the lp pistons worth anything? I know they are no longer available. What about the lp intake and exhaust manifolds? Any information would be greatly appreciated! Thank you.

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jakee

02-27-2007 17:18:55




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 Re: 301 LP engine on gasoline in reply to Dan Dargeloh, 02-27-2007 13:58:23  
kb what is the purpose of cracking the head bolts?? have never heard of this.



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K.B.-826

02-27-2007 19:46:09




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 Re: 301 LP engine on gasoline in reply to jakee, 02-27-2007 17:18:55  
To get an accurate torque reading, the bolt needs to be turning. Lets say you've got a head bolt on an engine you just put back together and have had running that you want to retorque to 95 ft lbs. The bolt will have loosened some due to expansion, but it will still be quite tight. It will require more than 95 ft. lbs. of force to get that bolt moving. This is called "break out" force. Your torque wrench will click before the bolt even starts turning. No problems will be caused by cracking each bolt loose, as long as you do it one at a time. Once I have done this, I run back over all of the bolts without cracking them loose.

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K.B.-826

02-27-2007 15:20:36




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 Re: 301 LP engine on gasoline in reply to Dan Dargeloh, 02-27-2007 13:58:23  
The gas version has a hard enough time lasting on regular pump gasoline for anything other than light work. 93 octane is recommended when running hard. As long as you're in there, carefully measure the bores, hone or have them machined oversized if needed, and install new gas pistons, as well as wrist pins and bushings. Those engines are famous for developing a knock as the wrist pins wear, so I would definetly recommend starting with new parts. The LP head and manifolds should work fine. Make darn sure your valve guides, valves, and seats are good, as burned valves was the other major problem. Oil runs down the valve guides and forms deposits on the valve, which causes poor heat transfer from the valve to the seat. This is why LOW ASH oil is the only oil that should be used in these engines. Your Case-IH dealer will have it, as will any good farm oil supplier. Consider using new head bolts, make sure the head and block are flat, give the head gasket a light coat of hi-tack sealer, and retorque the head bolts after you have had the engine hot and under a good load for a couple hours. Once the engine is just cool enough that you can stand to work on it, crack each head bolt loose and retorque to 95 ft lbs. one at a time in sequence.

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Owen Aaland

02-27-2007 21:58:12




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 Re: 301 LP engine on gasoline in reply to K.B.-826, 02-27-2007 15:20:36  
The gaskets I have used for these engines have a sealant on them already. It looks like the gasket has a coat of shelac. You should not use sealant of any type on these. (Once these gaskets are installed, if you apply air pressure the cylinder you will often see them leak.) The sealant on these gaskets seals with heat. Once the engine has reached operating temperature they will seal.



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Dan Dargeloh

02-27-2007 17:04:29




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 Re: 301 LP engine on gasoline in reply to K.B.-826, 02-27-2007 15:20:36  
Thank you K.B.-826 for the response. I'll get me a new set of gas pistons for it. It won't be used for any heavy field work, so hopefully it'll last. I know what you mean about the wrist pin bushings. The old engine had a loose one in #1, and yes it made noise even though it wasn't very loose. This 806 gasser will have to make a better loader tractor than the 460 gas I'm using now. That tractor is going to receive a 263 I've got out of a 615 combine I junked. Atleast it will have a little low end torque with that engine. Thank you aqain for the response, you've been very helpful. Dan from Milford, Nebr.

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