806 LP (301 engine)

avant 1735 · Jul 13, 2016

What is the difference if any in an LP head vs a gasoline head? I have a propane 806,(301 engine)that needs a rebuild, if I get a gas motor and rebuild it what would be the difference. Thanks for you input

fastfarmall · Jul 13, 2016

Well i am guessing it wont have stellite valves and harden seat's.And a gas in going to have less compression!

Owen Aaland · Jul 13, 2016

Basic casting is the same. The early LP units had different seats and exhaust valves. Later LP engines used the same head as the gasoline engines.

the tractor vet · Jul 13, 2016

No they have harden seats and compression ratio is the same .

kub6040 · Jul 13, 2016

Agree, the best I can tell 806 gas and lp use same components pistons ,heads ,valves etc.

fastfarmall · Jul 13, 2016

Well thats a good deal,that way the gas engine will last that much longer.

BarnyardEngineering · Jul 14, 2016

Curious, why would you "get a gas motor and rebuild it?" The engine in the tractor now is almost certainly in better shape because of the cleaner burning LP, and would be a much better candidate for a rebuild than some random engine out of a junkyard.

Curt Cooke · Jul 14, 2016

Having owned one and had it apart more than once I believe I can say for sure that the pistons in LP are different than a gas. I needed a piston as I had one destroyed by a broken piston ring. At that time I had to replace that piston with a gas engine piston. My other 5 pistons were domed, the gas piston wash dished.

ejr-IA · Jul 14, 2016

compression ratio was different lp is 8.71 to 1 and gas is 7.7 to one

pete 23 · Jul 14, 2016

We didn't have much success with the 806 LP engine. Problem with LP engines in general is that they will lug down to their last breath where a gasoline engine will give her up. This leads to much overloading , overheating and , well, just never worked out. We had the same results with the trucks as the drivers would just lug heck out of them. Rode with a guy road testing and it was terrible how he lugged it. But, he would swear on a stack of bibles he was very cautious. The 806 did use higher compression pistons. I think the heads ended up same as gas because the gasoline engines went the stellite valves and seats. Not real sure of that though. I know we always ended up putting stellite valves in all the 706 gas, but not sure what seat I used. Know I replaced almost everyone I had apart after I learned they were usually a loose fit in head. You could use a screwdriver and a very light tap would move them. Used .015 oversize.

redgems · Jul 15, 2016

Just had my C301c engine rebuilt at machine shop. 1966 806 L.P.
This machine shop did lot of these in the day & one guy is still there from that time.
They used their old spec books on it.
They rebuilt head with Hard seats & valves. They have better machining methods now and seats were redone and cylinder bores were re machined to accommodate the new sleeves for no movement.
Redgems

redgems · Jul 15, 2016

Wish I would of got a picture of bottom of head.

806 LP (301 engine)

avant 1735

Member

fastfarmall

Well-known Member

Owen Aaland

Well-known Member

the tractor vet

Well-known Member

kub6040

Well-known Member

fastfarmall

Well-known Member

BarnyardEngineering

Well-known Member

Curt Cooke

Member

ejr-IA

Member

pete 23

Well-known Member

redgems

Member

redgems

Member

Similar threads