"blow-by" oil drip?: Tractor Projects  -- General Tractor Discussion Forum and Review "blow-by" oil drip?: Tractor Projects -- General Tractor Discussion Forum

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 03-30-2001, 17:58 Post: 26116
tom harris



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 "blow-by" oil drip?

I'm told that the 2120 Ford series spill oil at idle. I was looking at a 2120 on a used tractor lot and noticed a very slight drip. The owner said that this is a known problem and that it really isn't a problem in that it only happens just a little and only at idle. Has anyone heard of this and should I be concerned?






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 03-30-2001, 18:33 Post: 26119
Tom



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  blow-by oil drip?

I have a NH 1220 that does the same thing.
The dealer told me all NH do it and theres nothing wrong.Well it's been over a
year now and it's the same,it uses about a half to one quart in 100 hours.
Tom






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 03-31-2001, 08:19 Post: 26133
Art White



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  blow-by oil drip?

Not to bust your bubbles but if you were running a over the road truck you wouldn't drive thru to many DOT inspections with that going on. It might be normal for the Ford New Holland tractors but it doesn't show me to much as far as Quality! Less than a thousand hours and that means it compares to other make engines at 6000 to 10,000 hours. I had not heard of this before and it is interesting, maybe there is more to a good tractor than ergonomics.






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 03-31-2001, 09:53 Post: 26136
Bird Senter

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  blow-by oil drip?

I don't think I ever heard of an oil drip being "normal" on anything but Harley Davidson motorcycles. I know it sometimes happens on some really old machines, but if it were mine, I'd have to find the source and fix it, or else that machine wouldn't be around long.






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 03-31-2001, 15:41 Post: 26140
Tom



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  blow-by oil drip?

Thats what they tell me. It's common on Fords and NH, the motor does have 2800+ hours on it.
I did have the motor rebuilt by the dealer that I got the tractor from, but I only have about 50 hours on the rebuild.The only thing they found wrong was a bad rocker arm ,but I had them do the complete motor.
PS Bird my tractor was made in JAPAN not by Harley Davidson so I know it shouldn't leak or break down or fall apart. Anything else ?
It's still a nicer tractor than the Kubota L345DT that I had.
Tom






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 04-01-2001, 05:35 Post: 26149
TomG

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  blow-by oil drip?

I guess the drip is coming from the crankcase breather, but I don't know if exhaust fumes are visible as well. If blow-by is the explanation, I believe you'd expect to see fumes. Exhaust gases burn some oil around the oil rings after it gets past the compression rings. Also, blow-by is greater when the engine is loaded at RPM than unloaded at idle. I don't have any thoughts about why only at idle--I wonder. However, if I was trying to make sense of the 'it's normal explanation', I might think that a crankcase is filled with an oil mist during engine operation. Any positive pressure in the crankcase is going to expel some air out the breather, and some oil mist along with it. The mist collects in the breather pipe and drips. Any engine is going to have some blow-by, and probably a slight drip--but very very slight in a good engine. Perhaps the breather pipe attachments in NH engines are more prone to collecting oil mist, or maybe the crank and other designs sling more oil around. Don't know: That's pure speculation, but if true it means the 'it's normal' explanation might be OK. Of course, the idea of what's normal to somebody trying to sell a tractor may be different from somebody buying one. Checking for blow-by is a 'tire kicking' sort of test for upper engine condition. A compression test, or even better, a compression leak down test is a more precise test, and for which operating specs are published. I believe I'd want to at least make sure the compression is within specs before taking on an engine where I saw oil dripping from the breather.






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Projects Forum

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