6G Celicas Forums

Hello.
Sorry for my bad english

My 7afe have been smoking blue smoke for some time now.. and the smell of oil is present almost all time (USE ALOT OF OIL!)... It smokes never when idle, only when i give it some trotle.
i have been thinking it may be the Valve seals, but it might be the piston rings aswell...
what is your opinion?

Piston rings most likely. You can try to do a piston ring soak on it with Seafoam or Marvel Mystery Oil to see if maybe its a stuck ring, but most likely they are shot.

i have done a compresion test and all the sylinders are the same..
160 psi on nr1
160 psi on nr2
165 psi on nr3
166 psi on nr4

any sugestions.?

A good way to tell if its your valve stem seals is to drive down a very steep hill. Keep your foot off the gas to generate vacuum for a few seconds, and then get back on the throttle. If it smokes as soon as you are back on the throttle, then you are seeing the oil that was pulled past the valve steam seal getting burned. Mine has started doing this recently and i have perfect compression and less than 5% difference on a leak down test.

It also helps to do this test when the engine is not fully warmed up. Once I am at operating temp, the symptom is less noticeable.

This post has been edited by lagos: Jul 4, 2014 - 12:13 PM

compression rings might be alright, oil scraper rings might be sludged up

Looks like a long weekend for me any one knows the piston rings specs? sizes and diameters?

engine/transmission stickys
http://www.6gc.net/forums/index.php?showtopic=73956

dint find the size. but i got them the hard way found the spare pistons whit rings and measured them
1 Ring 1.20mm
2 Ring 1.50mm
3 Ring (oil) 3.00mm

The order list is put in then
New piston rings,
New valve seals
New head gasket
New Main rod bearings
New Crank bearings
ect.

The 7A is NOTORIOUS for burning oil due to stuck rings. Piston soak it and run a flush to free them up as much as possible and then start using 20W-50. Burning oil doesn't hurt anything, and if you can get it to where it doesn't have visible smoke and you only have to replace a quart every 1,000 miles then who cares.

O2 sensors and catalytic converters dont like oil

If he can get it to where there's no visible smoke it'll be fine, burning a quart every 1,000 miles is within factory tolerances. There's no point in spending a small fortune and the hassle of rebuilding the 7A to stop it from burning a little oil. Run the engine into the ground, then replace it.

Also anti-fouler and test pipe, problems solved.

not for the upstream sensor that sets the adaptive air/fuel ratio....

Take it out and clean it once a month if it still smokes badly. That or yank the anchor out and throw in a 20 valve.

is burning a Quart per 1000 miles really within tolerance? that's like 3 quarts per oil change. I lose 2 quarts per oil change, a little into the coolant, a little down the back of the head, not bad enough to leave spots in the driveway and doesn't smoke.

Its burning it in the combustion chamber which will mess stuff up, on the backside of the motor it is only going to coat you undercarriage and act as a rust inhibitor

Yep, actually up to a quart every 1,500 miles is. Pretty much anything they can do to minimize warranty work. Then you have Wankels that burn by design.

i dint pass my MOT whit the smoking.

Ahh, see where I live they don't have emissions or even visual inspections. So I tend to forget others aren't as fortunate. Still, I stand by what I said earlier with doing the piston soak and flush then changing out to 20W-50. You can even throw in some stop burn if that kind of thing is even sold over there just to pass inspection. It really won't cost anything and it should make it to where it can be lived with easily, just have to check your oil every 1,000 miles.