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White Smoke


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my mate just over filled the oil in his 33 and now it is blowing smoke. he also changed the PCV valve. would this cause the sudden appearance of the white smoke?

also the head is only vented through the pcv. the breather hoses are blocked.

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ok, now apparently it only does it when he backs off. not during acceleration.

When you back off, theres vacuum in the inlet manifold which opens the pcv valve. It could be because of excess oil (built up in the head and dumped into the pcv), or maybe the pcv was reinstalled incorectly. I'd suss it out to be sure

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no its not my tyres. i wish that would be a nice side. I blows only under load

which is it? under load or under deceleration? you told me before it was only when you back off.

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if the pcv is rooted (blocked) then you'll get a buildup of pressure in the crankcase and it will start to blow oil out of your seals as well as past your rings. if it is open all the time then you'll get ALOT of what seems to be blow-by.

the head doesnt vent through the pcv, that is only for the crankcase to vent.

keeping the breathers blocked will build up air pressure and force oil through other parts of your motor (valves) and could possibly damage your valve stem seals if too much gets past.

get the breathers connected again and it should stop the problem. if not, its his pcv.

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if the pcv is rooted (blocked) then you'll get a buildup of pressure in the crankcase and it will start to blow oil out of your seals as well as past your rings. if it is open all the time then you'll get ALOT of what seems to be blow-by.

the head doesnt vent through the pcv, that is only for the crankcase to vent.

keeping the breathers blocked will build up air pressure and force oil through other parts of your motor (valves) and could possibly damage your valve stem seals if too much gets past.

get the breathers connected again and it should stop the problem. if not, its his pcv.

How do you check if the PCV is stuffed i.e. open all the time which is the problem i believe i have.....cause ive got what seems to be heaps of blow by, but the engine was rebuilt in feb

Ps soz to hijack the thread but i figured it was better than starting another.

Andrew

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if you take the pcv hose off the manifold (when the car isn't running) then blow through the hose you shouldn't be able to blow, but then it you suck it should open and you should get a mouthful of oil fumes (bit nasty).

ok, bit of an update. he (ucd12r33) has got the breather pipes breathing again. also it has stopped blowing smoke. it will do it occasionally if he punches it off the line, but no where near as bad as before. also it seems to have burnt off all the excess oil. it seemed to be that as it was burning off oil it went away. i had originally put it down to the fact that he had put about 1L too much oil in and it was sucking excess blowby through the pcv at vacuum. he went and saw a mechanic who thought it might have been the fron seal on the turbo. the turbo is only a few weeks old. but if the seal was gone it shouldn't be getting better.

compression is ok (got it tested too). the problem only started when he put too much oil in. and seems to be going away now that it has burnt of some oil.

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smoke off the line could mean worn rings/broken ringland or valve stem seals. but valve stem seals would be more on deceleration.

give it a while before you start assuming its a constant problem because as you said its still burning off oil. give it a few days then report back as the oil will be burning off a few of his parts.

also, if your pcv is a bit sticky or isnt closing and opening freely then soak it in some fuel or metho, then spray some wd40 into it.

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smoke off the line could mean worn rings/broken ringland or valve stem seals. but valve stem seals would be more on deceleration.

give it a while before you start assuming its a constant problem because as you said its still burning off oil. give it a few days then report back as the oil will be burning off a few of his parts.

he just said it is pretty much gone now.

i hadn't thought of valve stem seals.

it does have a bit of oil coming out out of the breather pipe (has had for a while, since before the turbo install). it isn't constant, but every now and then you will notice some oil around the rocker cover (used to have a split in the catch can hose where it would come out)

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ok, well the compression test showed that compression was ok. not sure what the fidures were (since it's not my car and i wasn't there) but the mechanic said they were fine.

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i did, but he hasn't got around to it yet.

i saw him drive up the street this morning and he gave it a stab. didn't realyl see any smoke when he stabbed it, but there was a little bit when he stopped in traffic, but it almost looked like condensation.

also, when i said it was burning off oil, i meant that it was just using oil, not that oil spilt on the motor. it kind of sounded like that's what i meant.

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i want to put it on the dyno to check the tune on it (since it has only been road tuned) but he doesn't want to until he has it all sorted. the tune is pretty safe so i'm not worried from that respect.

it has been using a little bit of oil for a while now, but it is just hard to work out exactly where it is coming from. it never blew any smoke really (just the odd puff when stabbing it off the line, but even then it might only be once every few days, never a constant thing) so it has me baffled.

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