umm............. well i haven't started the g40 up in bout 4 days checked the oil and water needed a bit of water.. and the oil was just above minnium so i toped the oil up and water and i went on my way....... drov for about 3 miles........... as i was cumin back seeeeeeeeeeeeeeeeen alot of smoke cumin out the car..... it was blue!!!!1
piston rings or vavle seals i think??
Any checks i can do ??
sounds like a charger oil seal to me.. see if the boost pipes are caked in oil
they have a bit of oil in them?? you mean like excessive oil is it???
a finger full is ok, more is bad!
the pipes should have a slight coating of oil, if it's dripping out when you undo one of the pipes then it's too much. Also try a compression test and a leak down test if the boost pipes seem ok.
A compression test on all 4 cylinders?? what happens if they are down on 1 cylinder or sumthing
Whats a leek down test??
If one cyl is down then it could be rings or a valve guide (more likely to be a cracked ring if it's just started). A leak down test uses compressed air to fill a cylinder and see how long it holds the air (to get past rings etc) you need a tester with a compressed air supply.
if it's down on compression then a leak down test can also tell you hwere the air is getting out. You basically just listen to where you can hear it escaping, you'll hear it blowing out of the oil breather if it's getting past the rings. To do the test properly you need a proper leak down testing kit but you can do a basic test with just some way of forcing air into the engine, I've even heard of someone using a foot pump but a compressor is best. I took an old spark plug, smashed the ceramic out of it and then welded an air line fitting to the top of it. Set the cylinder you are doing the test on to TDC, screw in the spark plug/air line fitting thing and hook up the compressor. Use the regulator on the compressor to put a decent amount of pressure in (something like 100psi) and then listen for air escaping.
To do a compression test you need to buy a tester kit but they are only like £10-£15.
Just done a compression test
1. 160psi
2.160psi
3.170psi
4.160psi
Number 3 is 10psi more ??? any ideas lads
Thats pretty strong, and less than 10% variation across the pots too. I'd say you've got a charger seal gone, check your oil outlet/drain on the the charger, if thats blocked or restricted in any way then the majority of your oil is gonna look for a different way out via the seals.
Though from a different angle, perhaps that number 3 has a nice pool of oil sat in the top of the piston giving a higher reading(unlikely though).
Whats the age/milage/history on the block & head, maybe it is stem seals.
Are you running crankcase breather into the charger inlet recirc air(standard OEM setup), if so you may have experienced some oil blowing up the breather, quite possible if you've just topped up your levels.This is more noticeable if your accelerating up hill as the oil washes to the rear of the sump, washes up the sump/block wall then hey presto you've got a hole which is removing crankcase vapours via the charger inlet(nice for the trees until the oil jions the party), once the oil is in this area for long enough then in eventually the it finds the charger.