Turbo seals replaced,now have blow by.

[oldfastpat]

Son drives car,car comes back not much boost.He says egt went higher than normal. 1200-1300 not for long, Comes back down to 800, Limps home. Some up and down play. Buy rebuild kit.saving for rebuilt 57 trim.rebuild went smooth figuring just a bandaid. Fire up with new kit in see blow by coming from everywhere! Much cussing insues. remember that rebuild done before had different bearing. so I do a quick teardown. put correct bearings back in.
The question is if oil moving past bearings is boost pressurizing crank case?
No I haven't had time to leak down or compression test. the only reason I short cut this was MONEY.And I have no faith in this car! fix one thing two new things go bad

 

[Poodles]

ummm... do you get the assembly balanced?

Turbos require precise balancing and tolerances or they won't last past startup...

 

[Rennat]

arent turbo egt's suppose to be up around 1400 at wot/max power?

 

[SPD TRP]

arent turbo egt's suppose to be up around 1400 at wot/max power?

I was told that if you have the right amount of fuel and your afr's are where they are supposed to be under boost, your egt's should start to drop ever so slightly when under boost.

Another determining factor when thinking of egt's is where the probe is positioned--either pre turbo (higher egt's), or post turbo (lower egt's), the difference can be 100-200 degrees different.

Just my .02

Wayne

 

[Rennat]

oh... thats true. the car i watched with EGT had it 1'' from the flange of the exhaust manifold (which is where its suppose to be as its the most accurate temp)

and why your egts would drop under boost is beyond me, its MORE pressure, MORE peak cylinder pressure, and MORE heat in the engine...

 

[SPD TRP]

oh... thats true. the car i watched with EGT had it 1'' from the flange of the exhaust manifold (which is where its suppose to be as its the most accurate temp)

and why your egts would drop under boost is beyond me, its MORE pressure, MORE peak cylinder pressure, and MORE heat in the engine...

The richer you run the coller your egt's will be, conversely, the leaner you run, the hotter your egt's will be.

Wayne

 

[Rennat]

The richer you run the coller your egt's will be, conversely, the leaner you run, the hotter your egt's will be.

Wayne

now THAT makes sense... except thats really only true under WOT right? because when your just driving around at 14-16A/F cruising obvisouly your not going to be at 1400degrees.

 

[Poodles]

that's why you have EGR, it will lower the temps...

 

[Rennat]

thats only on part throttle, and light loads like going up hills... EGR isnt open at WOT...

 

[SPD TRP]

now THAT makes sense... except thats really only true under WOT right? because when your just driving around at 14-16A/F cruising obvisouly your not going to be at 1400degrees.

My 1j runs between 800 and 1000 just running around town, no wot runs, probe is post twins.

Wayne

 

[frontierguy25]

Ok, you are saying blow by, it seems as if this has gotten of track. Are you getting oil out of your dipstick, spark plugs or just out the turbo?

 

[oldfastpat]

After much searching and testing I have more questions than answers. blowby is better(much less) compression test good. Tried to do a leak test on plumbing.with 30 to 35 lbs .Plugged everything i could think of. Can't get more than 3-7 lbs and won't hold.Ran out of time, But i will try to isolate TB,Intake.And IC plumbing. I was thinking that the high EGT could be from lean condition.(leak). The engine, valve train appear OK. I can't tell how we got the blowby from the turbo.It spins freely,but it won't boost.
I'll keep trying to find the problem(s) I know its some little thing thats keeping me from finding out whats wrong.

 

[frontierguy25]

After much searching and testing I have more questions than answers. blowby is better(much less) compression test good. Tried to do a leak test on plumbing.with 30 to 35 lbs .Plugged everything i could think of. Can't get more than 3-7 lbs and won't hold.Ran out of time, But i will try to isolate TB,Intake.And IC plumbing. I was thinking that the high EGT could be from lean condition.(leak). The engine, valve train appear OK. I can't tell how we got the blowby from the turbo.It spins freely,but it won't boost.
I'll keep trying to find the problem(s) I know its some little thing thats keeping me from finding out whats wrong.

Blow by is when you are getting oil past the rings or you are blowing out your dipstick or when you are blowing out oil from the back of the turbo through the seals. You have no crank case pressure or too much pressure.

 

[oldfastpat]

Found problem...... Two cylinders 30 lbs. spark plug in#2 cyl has electrode broken at end. Guess whats for sale? got almost 10 grand trying to make it right.It's time to cut losses. I will post in for sale section later.thanks for everyones info.