ThIn oil

[bruiserbrad]

my car started blowing smoke bad the other day so I checked the oil and it was really thin almost like the consistancy of water. I changed the oil today and as soon as I started the engine up and when IChecked the oil it had already turned to the water consistancy.
Has this happened to anyone? Does anyone know what the hells going on??

[bruiserbrad]

I was thinking it could be my fuel pump leaking into my oil? Could this be a possibility? How could I fix it or check it?? Any help would be much appreciated

[machone]

you cold have a crack in your fuel pump in the diaphragm....undo the sump plug or check the dipstick if it smells of petrol then thats what id say it is

[bruiserbrad]

How do i check the diaphram?

[ari666]

you cold have a crack in your fuel pump in the diaphragm....undo the sump plug or check the dipstick if it smells of petrol then thats what id say it is

WTF am i reading???

[matty94]

WTF am i reading???

Im thinking the same thing?

[Sabbath']

So should i put my face right up against the sump when i undo the sump plug to check for a smell or wait?

[Darcon666]

you cold have a crack in your fuel pump in the diaphragm....undo the sump plug or check the dipstick if it smells of petrol then thats what id say it is

Ummmm.... unless I am mistaken(...and I am NOT a mechanic) the fuel & oil systems in any modern internal combustion engine are completely independent of each other.

So, WTF????

[ari666]

well, the mechanical pump attaches to the side of the block and is oiled, so theor-echnically it is possible, but the chances of the pump diaphram leaking, then fuel miraculously running through the pump assembly, down into the pump crank, then BACK UP into the engine, are really really really reallly low.

if i had a clue what the OP was on about i would post some kind of better answer, but for now i am just left speechless.

[VKCOMMO]

Is anyone else thinking apart from fuel in the oil... such as maybe the watery consistency is... well.... water?? Head gasket cracked?

[Darcon666]

well, the mechanical pump attaches to the side of the block and is oiled, so theor-echnically it is possible, but the chances of the pump diaphram leaking, then fuel miraculously running through the pump assembly, down into the pump crank, then BACK UP into the engine, are really really really reallly low.

if i had a clue what the OP was on about i would post some kind of better answer, but for now i am just left speechless.

Never said it wasn't possible... but diaphram leaking into the crank case???? anyways smoke out the tail pipe(I guess this is what the OP was refering to...lol) would mean oil in the combustion chamber in some way not fuel in the crank case.

[SL/ENUT]

I reckon the oil is the wrong one. Sure, when oil gets hot, gets thinner however, get a diff viscosity may help there.

[DANNY8]

I've heard of the fuel pump leaking fuel into the oil, it has happened. But yeah check the dipstick and if the oil on the end smells like petrol then that could be the prob. If it was water leaking into the oil it would turn white-ish in colour....again check the dipstick. If not maybe it's like wat Damo said, wrong oil??

[Reaper]

I'd suspect that there would need to be a *lot* of petrol in the oil to thin it that significantly in which case the whole motor would stink of petrol and there'd be a 50/50 chance of blowing the rocker covers clean off the engine.

What grade of oil are you putting in the car and when you examine it, is it warm or cold? As for the smoke - if it's an old motor then chances are you will be getting a bit of blow by caused but worn rings.

Reaper

Reaper

[vkberlina]

First question that should be asked

What oil are you putting in?

Scott

[machone]

lol damn knockers ok on a mechanical fuel pump for a 308 if you did a cutaway section of it theres a diaphragm a plate that sits on it with springs...if the Diaphragm Spindle oil Seal wears out in this pump.. Oil will leak petrol mixes with it then it gets into the upper part of the unit then it can travel back into your engine going back up the acutualor arm pivot shaft ... Im not saying this is the reason thats happening but it can happen.

[machone]

So should i put my face right up against the sump when i undo the sump plug to check for a smell or wait?

yep and make sure your cars been running for an hour also grab hold of the exhaust for extra support

[Jonno]

is the car getting low oil pressure...?

Are you sure it's not the oil your using? What are u using? I use penrite hpr30

[L67 Calais]

yep and make sure your cars been running for an hour also grab hold of the exhaust for extra support

Burn Much???

[Tree cutter]

Best way to check the fuel pump is to unbolt it and connect fuel hoses back up then pump it manually by pushing on the lever that normally runs on the camshaft. Fuel will run out near the lever if the diaphram has a hole in it.
If something has gone wrong with the carby causing it to run very rich, then you will burn oil also. The oil will go black very quickly if this is the problem.
It would be a good idea to take the spark plugs out and have a look at the colour of them to see if it is a cracked piston or rings in one cylinder causing your engine to blow smoke. The plug will be black and wet if you have a cracked piston or rings.

[DerekP]

As others have pointed out - what oil are you using? Use an oil for high km / older engines like Penrite HPR 50 or 30.

I doubt it would be the fuel pump, I have had quite a few pumps fail over the years and every time the the fuel just leaks out of the diaphram housing onto the ground below. Mine have all been V8's however.