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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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 09-04-2001, 10:59 Post: 31556
FarmerWannabe



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 Oil discharge

I'll be the first to admit I don't understand how diesel engines work- something about compression. Anyway, after using my B7200D pretty hard (6-7hrs!) moving fill dirt for some culverts I noticed more than a few drops of oil (or oily substance) coming from a drain tube near my front left axle. I traced this tube to the top of my engine housing. The flow varied but at one point there was a small (1-2 inch) puddle of oily liquid. I checked my oil level (while the tractor was still warm) and the dip stick showed plenty of oil (although it looked thin). Some questions: What is this tube? What is this liquid? What is a normal amount of discharge under heavy use? Should this bother me? Thanks.






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 09-04-2001, 11:59 Post: 31558
Bird Senter

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 Oil discharge

Oil or oily substance? Could it have been antifreeze? As far as I'm concerned, NO oil discharge is the only thing acceptable, but if you have no coolant recovery jug (I don't know whether the 7500 has one or not), or even if you do have one and it's too full, some coolant overflow can be expected. And that's the only discharge tube I can think of in the area you mentioned.






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 09-04-2001, 12:16 Post: 31560
FarmerWannabe



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 Oil discharge

This was definitely not antifreeze. It was black and felt like oil. It is coming from a blowout tube attached to the top of my crankcase.






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 09-04-2001, 12:38 Post: 31562
Bird Senter

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 Oil discharge

OK, then my guess would be a dirty or stopped up breather that either needs cleaning or a breather element replaced.






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 09-04-2001, 13:09 Post: 31563
FarmerWannabe



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 Oil discharge

That sounds like it makes sense. Is this difficult to do myself? Sounds like I need to break down and get a manual... Thank you for your help.






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 09-04-2001, 13:34 Post: 31564
Bird Senter

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 Oil discharge

If you decide to buy the manuals, be sure you get both the "Workshop Manual" AND the parts manual. They're good together, but in my opinion if you only had one, you'd be better off with the parts manual than the shop manual. I don't know for sure about your B7200, but to get to the breather element on my B2710 you have to remove the head cover (4 nuts with a little washer under each one - don't know whether those washers would have to be replaced) and I'm pretty sure I'd want to replace the head cover gasket. Doesn't look like it would be a big job at all, but I've never had to do it on mine. And while I THINK that's likely your problem, I think you should probably ask the dealer, or a better mechanic than me.






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 09-06-2001, 07:54 Post: 31618
TomG

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 Oil discharge

Good idea to verify the breather isn't obstructed. If it's a closed crankcase system, I'd check the equivalent of the PCV valve. I'd also check the engine oil level, since excessive oil conceivably could put more oil in the rocker arm area and sling it out the breather (if the breather comes out of the rocker-arm cover). When an engine is running, the crankcase is filled with an oil mist. Blow-by can carry the mist to the breather where it will drip on the ground. Blow-by usually is accompanied by visible exhaust coming out the breather on an open system. I'd check if exhaust smoke is coming out of the breather. For a closed system, you can take the hose off at the rocker arm cover and run the engine to see if smoke comes out the rocker arm cover. If there's quite a bit of blow-by, it might be good to run a compression test to determine general engine condition.






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 09-06-2001, 10:07 Post: 31622
FarmerWannabe



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 Oil discharge

OK now you guys are starting to scare me. I'll go over to my dealer and talk with them. Any idea why the flow is so variable? One minute the oil is running out and the next minute there is nothing. Also, I was unclear about the smoke. Is smoke good or bad? Its not easy to have the tractor looked at since I don't have a trailer to transport it...






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 08-07-2001, 05:41 Post: 31644
TomG

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 Oil discharge

Appreciable exhaust smoke coming out the breather isn't good and is called blow-by. Blow-by can be caused by some minor problems, such as stuck rings, but often is the sign of worn piston rings that allow combustion gases passed the compression rings and oil rings. It burns some oil on the way to the crankcase and out the breather tube, which makes the smoke. On closed crankcase ventilation systems, the breather is routed back to the intake manifold through a valve so you don't see the smoke unless the tube is taken off at the rocker arm cover. If the oil on the ground is from the breather, then you have an open system and should be able to see if there is appreciable blow-by. Before there's too much worry, it would be good to find the breather and verify that the oil is coming from there. An oil leak on the engine also will puddle oil on the ground.

Even if there's blow-by, it's not cause for too much worry. An engine can run fine for years with smoke and oil coming out the breather, but reduced compression is associated with worn compression rings. If the compression gets too low, a diesel won't start very well. A compression test will indicate where the engine's at. I'd also verify if the engine oil level is correct and the right viscosity, and also if the exhaust gases are normal. A warm diesel puffs a bit of light gray smoke on acceleration. Persistent or different coloured smoke may indicate various problems. Excessive or wrong engine oil sometimes produces white exhaust.






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 09-10-2001, 10:19 Post: 31728
FarmerWannabe



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 Oil discharge

Thanks, Tom. I took another look and think the breather may be harder to get to than I thought. My oil level looks like it might be high so I think I might drain some out and see what that does. Thanks again, hopefully this will stop my problems. My exhaust smoke is very light in amount and color so I don't think it is the rings but will have a compression test done when I figure out how to get my tractor to the dealer.






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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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Art White 4 | BillBass 1 | Bird Senter 3 | FarmerWannabe 10 | Hans Top 1 | Rich Luhr 1 | TomG 7 |




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