AI-400 Blowby

[Boostedfa5]

2004 AI-400 

Developed alot of blowby on the last load. Driver states didn’t over heat it. Had good oil pressure and coolant temp when he pulled into shop. Any chance high EGT could have caused it? Was my personal truck before and never let it get over 950egt but drivers don’t care. Also what has everyone paid for an in-frame? 

[fjh]

I personally would check the turbo if this came on suddenly!  Ai engines turbos are prone to fail in this way!

[Joey Mack]

FJH has a point..

Who's doing the inframe if you go that route? 

[Boostedfa5]

2 hours ago, fjh said:

I personally would check the turbo if this came on suddenly!  Ai engines turbos are prone to fail in this way!

Will check out turbo and air compressor today. 

[Boostedfa5]

2 hours ago, Joey Mack said:

FJH has a point..

Who's doing the inframe if you go that route? 

If it gets To that point my local dealer. 

[Joey Mack]

I would expect $30K+..  I hope others comment on the cost. 

[The Heinz]

Joey's pretty spot on. I don't have the hard numbers because the last ASET in-frame we handled was so long ago, but the last engine swing for an ASET we did in '22 was over $34k. Add inflation into it as well as you not getting the same price as the fleet this was done for on our end, and it'll skyrocket. 

[fjh]

3 hours ago, Boostedfa5 said:

Will check out turbo and air compressor today. 

Get it hot remove the drain tube and run it into a clean pail ! Rev it up a bit !If you have Vapor there you have  your answer!also take an oil sample before you go head first into an in frame ! It can be liners leaking check for coolant!

[Boostedfa5]

4 hours ago, fjh said:

Get it hot remove the drain tube and run it into a clean pail ! Rev it up a bit !If you have Vapor there you have  your answer!also take an oil sample before you go head first into an in frame ! It can be liners leaking check for coolant!

Not making oil and oils clean, no vapor coming from turbo drain, not much smoke out of exhaust and charge pipes are dry 

[Mark T]

15 minutes ago, Boostedfa5 said:

Not making oil and oils clean, no vapor coming from turbo drain, not much smoke out of exhaust and charge pipes are dry 

That test for the turbo sometimes you need to cobble the return line to run into a pail and look for bubbles in the oil that collects in there when the return is under the oil in the pail, and just to make it interesting it needs to be sorta hot (like operating temperature)  it's a messy test and you'll pump a fair amount of oil out into a bucket doing it. But ???? 

[Boostedfa5]

22 minutes ago, Mark T said:

That test for the turbo sometimes you need to cobble the return line to run into a pail and look for bubbles in the oil that collects in there when the return is under the oil in the pail, and just to make it interesting it needs to be sorta hot (like operating temperature)  it's a messy test and you'll pump a fair amount of oil out into a bucket doing it. But ???? 

I tested it when it was hot into a pan. I’m almost positive it burned up a cylinder. Sounded like it had a dead hole while cranking and the vapor coming out the fill tube had a inconsistent pulse to it. I have my engine guy coming tomorrow but it’s looking similar to when I leaned out a cylinder in my race car. 

[fjh]

K if it’s puffing out the fill tube you likly got a bad hole !  So bad news I guess!  You may be replacing the turbo now if bits have gone through the hot side ! Depending on hours and money you do a at minimum a one hole fix or an inframe! See if your guy can get a pai kit you may save a far bag of money on parts !

[Mark T]

Leak down test would be the next thing.  Or remove the exhaust manifold and look for a port that looks different to see which hole to start investigating more. Leak down or a bore scope in through the injector hole.  Never know, if an injector washed it down , maybe it doesn't need an entire inframe. Once the head is off, you'll see how worn the inside is in general. Sounds like you're going inside though.

[Mark T]

😏  the f in fjh is for fast fingers

[fjh]

4 minutes ago, Mark T said:

Leak down test would be the next thing.  Or remove the exhaust manifold and look for a port that looks different to see which hole to start investigating more. Leak down or a bore scope in through the injector hole.  Never know, if an injector washed it down , maybe it doesn't need an entire inframe. Once the head is off, you'll see how worn the inside is in general. Sounds like you're going inside though.

Or just shut down eups  one at a time ! To find the bad hole !