Why do I have white smoke!!!...still

[7m4runner]

Ok i discovered that white smote intermitenly starts pouring out of the exhaust, and them goes away and starts again a minute later. All this was after a toyota factory gasket, rebuilt head and APR's at 85 ft lbs. So I thought it was the turbo. I rerouted the turbo coolant lines and bypassed the turbo and it still smokes out of the exhaust. I did a compression test and it was all fine. It smokes so much I think the neighbors are worried!!:aigo: anyway the motor runs fine and idles fine and accelerates fine. I finally tore apart my motor, and discovered.....NOTHING. HG fine, head fine, no noticeable problems, no cracks in the cylinders walls, no noticeable steem from any cylindar combustion chamber. I am totally dumbfounded the only other thing I can think of is the throtle body, and mabe its cracked and coolant is leaking from there, but I never heard of that, Im soo at a lost I dont know where to go from hear, any suggestions

 

[SideWinderGX]

Some guy over on SF had a crack in his block, which allowed coolant to pour into one of the oil passages.

Maybe your head/block has a hairline crack which is allowing coolant to go into the chambers and be burned off. Only thing I can think of.

 

[a_sesshoumaru]

i bet it was your turbo oil seals blown, you shouldn`t tear your engine apart before checking basic things, how is you pcv system? routed properly or at atmosphere? but still i am very sure it was your turbo oil seals, try another known good working turbo and the problem will go away, dont forget to prime it first. Think, if all the white smoke you saw was wather, one mile after your radiator and coolant system should have been empty.

 

[suprarich]

Maybe your exhaust system is full of coolent from the previous leak?

 

[wiseco7mgt]

hahah i had a ct26 that did the same thing, it was only on occasions that it would throw white smoke.Beg , borrow or steal another just to test before shelling out coin on anything else.But first how many klms has the motor done? was there any noticeable lip in the bore when you changed the h/gasket? Is the crankcase over full and the smoke happens on down hills? Did you change your valve stem seals? sorry for the questions its just that they are a few common issues and a few that arent as common.
cheers

 

[queenskid926]

i thought oil was blue and coolant was white? why would the crankcase being overfilled have anything to do with the white smoke? just curious

 

[NeatOman]

If it was large amounts of oil then you would clearly see the blue tint, and also it dissipates rather quickly. Where Coolant lingers in the air and is clearly white, also when you put you hand close the the exhaust you will feel steam.

I have seen cracked TB before, but never herd of it on a MK3. The TB on a MK3 is held very well IMO and should never have that problem. Unless you have the support for the intake manifold taken off (the metal rod that holds it to the block) and the metal pipe in front of the TB over the Vale covers unbolted... then Maybe. Easy to check.

Simply put some dye in the coolant system and go nuts on the TB.

 

[wiseco7mgt]

If its overfull by a certain amount the oil drain from the turbo backs up and makes smoke(gravity drain from turbo)Normally shows up when going down hill when the oil all surges forward and blocks the turbo drain.Fairly common after swaps.
I only said this to show that there are a few different things that can cause white smoke not just to a point the finger at one specific thing.Check all the cheap things to fix first before pulling the engine to bits.
One more question, Are you having to top up the coolant level?

 

[jdub]

If its overfull by a certain amount the oil drain from the turbo backs up and makes smoke(gravity drain from turbo)Normally shows up when going down hill when the oil all surges forward and blocks the turbo drain. Fairly common after swaps.

Ummm...you would have to have a HUGE overfill to cause the turbo line to back up. Take a look at where the turbo line attaches to the block...if you had oil up to that level, the crank would be submersed. Fairly common...not a chance...actually damn near impossible.

 

[wiseco7mgt]

Ummm...you would have to have a HUGE overfill to cause the turbo line to back up. Take a look at where the turbo line attaches to the block...if you had oil up to that level, the crank would be submersed. Fairly common...not a chance...actually damn near impossible.

Why i said after swaps was because of useing the wrong size oil drain or drilling the oil return too low causing the oil to back up..

 

[jdub]

Why i said after swaps was because of useing the wrong size oil drain or drilling the oil return too low causing the oil to back up..

LOL...ok, whatever you say.
I guess *most* folks doing a motor swap changes the turbo drain and/or moves the return to the oil pan...especially on a CT26

 

[queenskid926]

LOL...ok, whatever you say.
I guess *most* folks doing a motor swap changes the turbo drain and/or moves the return to the oil pan...especially on a CT26

what i was thinking exactly. It makes since if your na-t on a 7mge but why would they change the oil return on a 7mgte?