oil in the intake..

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-Defender110-

-Defender110-

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Had a poke around my parents disco '02 td5, was taking off the MAF sensor when i noticed oil pooling in the rubber connector pipe (between the MAF and the plastic intake pipe. there isnt much of it and i checked the filter but the oil stops pooling once it reaches the MAF so its grand, question is, wheres it most likely to be coming from, and is it a problem?? :D
 
captainbeaky said:
Is there a breather in between the filter and the MAF?
Click to expand...

I was just going to say that, the suck side wont allow oil back to the filter, they were prone to oil in the looms anorl but dunt know if it gets down through the maf, but easy to check I guess if you have it off.
 
if thats a breather then ya? but really ive no idea.
 

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Looks like it...

Just checking - is the oil present in between the air filter and the MAF (The MAF is right on the air filter housing, isn't it?)- if so - that doesn't sound brilliant.

If it's after - then it's expected, as you have a breather in there - don't panic..
(Youu should see the oil I flushed out of a 300Tdi today!)
 
-Defender110- said:
if thats a breather then ya? but really ive no idea.
Click to expand...
Thats your crankcase breather non return valve. Pull the pipe from the cam cover off the valve and see if it puffs smoke when the engine is running. Most engines have a little blow by which causes crankcase pressurisation. If it belches lots of smoke and oil then you have a more serious problem.

The TD5 has an oil separator built into the cam cover which is supposed to condense the oil vapour before it gets piped to the intake. In reality a small amount of oil vapour will pass through the system and can be seen as film on the inside of the intercooler pipes. If it bothers you then fit the breather pipe to a catch tank and empty it when it needs it. I have a small piece of filter foam wedged into the pipe before it connects to the valve and I replace it every oil change. Its easy to check and replace it as necessary. This keeps any oil in the breather pipe and not the intake tract but lets the crankcase breath properly. Dont just bung it up or you'll start blowing oil out of the dipstick.

I know of several peeps that just pipe it down the side of the engine and out underneath or remove the breather pipe and fit a small filter direct to the cam cover. However this wont pass an MOT and you run the possibilty of gassing yourself if the fumes enter the cab. In the good old days the manufacturers used to vent direct to air but modern emission standards dont allow this.
 
If you see excessive smoke (aka 007 smoke screen) then yes there is a problem with either the rings, a piston, the head gasket, or more likely a leaking injector washer. A little puffing is normal especially when cold.

Hold your thumb over the vent for a few seconds then let go you will hear a slight hiss - if you cant hold your thumb over it or oil blows out of the dipstick or anywhere else then you need to find out why.
 
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