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ac89 
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Joined: 18 Mar 2015
Location: maine
Points: 325
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 Topic: Allis chalmers 433t motor smoke
Posted: 20 Feb 2021 at 7:23pm |
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Hey everyone. I have a 82 allis chalmers 715c backhoe with the 433t motor. Engine runs beautifully. The only thing is that it smokes blue smoke when it is idling. If I give it half throttle the smoke goes away completely. What would cause this? Injectors? To much fuel? Valves? I don't really want to tare Into it to much because it runs very well. It does start hard but that's how alot of allis chalmers are. Also want to add it doesn't use oil ive checked it since I bought it around a year ago and it doesn't use oil.
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
Points: 6627
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Posted: 20 Feb 2021 at 9:41pm |
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2 things come to mind, check the timing and are you using truck stop #2 diesel fuel. If you are, buy yourself some premium #2 fuel. Most farm COOPs have it. A lot of independant owned fuel suppliers don't.
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ac89
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Joined: 18 Mar 2015
Location: maine
Points: 325
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Posted: 21 Feb 2021 at 5:56am |
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Ok I may try the fuel. I have tried a couple additives.
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DougG
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Joined: 20 Sep 2009
Location: Mo
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Posted: 21 Feb 2021 at 2:40pm |
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Kinda sound pretty common - did it just start this ?
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TramwayGuy
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Joined: 19 Jan 2010
Location: Northern NY
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Posted: 21 Feb 2021 at 4:03pm |
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Does the crankcase oil smell like Diesel Fuel? The reason I’m asking is that you could have (2) problems!
Engine oil getting past the rings; and fuel getting in the crankcase. So over time, the burned oil is replaced by Fuel. Not a good situation. The rate of fuel leaking would have to be the same as the oil burning.
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
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Posted: 21 Feb 2021 at 6:48pm |
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My 180 does this, called 'Cold Oil Slobber' on older Low Compression Diesels. Do not maintain adequate Low Speed compression pressure or oil ring contact scrub to reduce engine oil on cylinder walls, thus 'Blue Smoke' exhaust. Fuel not being burned is White Smoke, Excess Fuel burning is Black Smoke, Oil Consumption (Regardless rate) is Blue Smoke and Steam is consuming coolant.
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ac89
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Joined: 18 Mar 2015
Location: maine
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Posted: 22 Feb 2021 at 12:05am |
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No it's smoked like this since I bought it a year ago. Ive checked the oil and its fine it doesn't have diesel fuel smell to it. It's a good running motor it does start hard. But with a small shot of ether it takes rate off no problem. Could be maybe the valves are out of adjustment? The valve cover gasket needs to be replaced so maybe I should check out the valve tolerances.
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DougG
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Posted: 22 Feb 2021 at 8:07pm |
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No I wouldnt - those dont change much - but Id say its common and run it ! Id be interested if it comes up for sale
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DrAllis
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Joined: 12 Sep 2009
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Posted: 22 Feb 2021 at 8:20pm |
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14 to 1 compression engines will do that especially if ambient air temps are cold. Quit idling it so much.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 23 Feb 2021 at 8:40am |
Fuel not being burned is White Smoke, Excess Fuel burning is Black Smoke, Oil Consumption (Regardless rate) is Blue Smoke and Steam is consuming coolant. 
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Like them all, but love the "B"s.
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ac89
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Location: maine
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Posted: 23 Feb 2021 at 5:57pm |
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Ok thanks everyone for the input. I'm going to leave it alone aside from replacing the valve cover gasket. As far as selling the machine goes that's a no go. I'm big into allis chalmers and finally found a decent ac backhoe. The transmission is very strong and brakes work excellent. Eventually I want to restore the machine to like new condition.
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