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Allis Chalmers Discussion Forum
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Differences in 190 gas and diesel

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LLR

11-10-2007 14:17:36




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According to the manual, the 2800 series 301 ci gas engine has the same bore and stroke as the 2900 series 301 ci diesel engine. Agco online parts even lists just one set of rings and connecting rod bearings for both engines. The question is what adds the compression on the diesel? Does the piston have a higher deck height or is all the added compression in the cylinder head? Im asking because i might need liners for a gas engine and cannot find any. Hoping to maybe use diesel liners and maybe machine the piston face. Thanks for the help

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LilFarmer

11-12-2007 16:19:46




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
LLR,

As Joe(TX) mentioned the heads are different and so are the pistons between the G2800 and D2800.

The sleeves, however are the same and are available separately from the piston and sleeve combo.

If you cannot get a sleeve and piston kit, you should be able to get sleeves only (From AGCO).

And unless your pistons have badly worn ring grooves you should be able to reuse them. The piston pin is not pressed into the con rod. The rod has a replaceable bushing in the upper end, so there should be no pin wear in the piston.

Hope this helps.

Paul

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Joe(TX)

11-11-2007 14:58:40




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
There is a G2800 and a D2800 engine as well as a D2900. The first a gasoline and the second a diesel. All are 301 cu in. Different heads between the gas and diesel.



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LLR

11-10-2007 19:05:50




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
Thanks for the help guys. I havent taken my engine apart yet, but do have water in the oil so im assuming the liners are leaking.



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LilFarmer

11-10-2007 17:58:30




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
Hi LLR,

Actually I have never seen the inside of a 2800 series gas engine, but I would have to believe the gas cylinder head has a combustion chamber in it while the diesel head is flat. I also don't believe the top of the piston would be any where near the same shape. The top of the diesel piston has a swirl chamber built into it, the gas psiton is probably flat or a little dished.

The pin (compression) height would also be different between gas and diesel.

I do however, have access to the parts manual on both of these engines and may be able to tell from the images if there is any dramatic difference between the two pistons. Unfortunately, it will be Monday before I can take a look.

Paul

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ohio

11-11-2007 14:11:59




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 Re: Differences in 190 gas and diesel in reply to LilFarmer, 11-10-2007 17:58:30  
The gas head is probably a closed chamber, with the combustion chamber in the piston, like the other "power crater" engines.



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Jr64

11-10-2007 17:53:21




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
If the 301 gas is simular to the D-19 gas, the compression is lowered by a concave cylinder head. The diesel heads are flat. I'm not positive as I've not had a 301 gas apart, but it's probably the same block assembly with a different head on it.



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K. Farmer

11-10-2007 17:35:12




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 Re: Differences in 190 gas and diesel in reply to LLR, 11-10-2007 14:17:36  
the 2900 had a turbocharger i believe. thats where the added compression came from



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