oil residue in #6 exhaust port

[Money Maker]

Couple of weeks ago installed everything in my sig. I ended up getting the wrong turbo shipped to me and I didn't catch it until I tried to tow with it.



Anyway today I am installing the correct turbo. I pulled off the new ats exhaust manifold and found that there is a film of black oil in the #6 port. Enough of it to have oiled down the metal gasket. I am certain that this was not doing this before the mods went on.



I have had a bit of smoke at idle for sometime now and have been using some fuel addatives to try and solve that but nothing has stopped it. Now I think I have found the culprit. My guess is that this is blow-by, but I'm not a diesel mechanic.



Anyone have any idea why this is happening and what I should expect to happen or how long it will last?

 

[Money Maker]

The turbo I am taking off is a sps 66. Could it have run me lean enough to have burned a hole in my piston?



I am thinking that this is:



1 hole in piston

2 blow-by

3 valve seat leaking

4 cooler egts not burning up all the extra diesel I am pouring in (doubtful but the easiest to live with)



How do you do a leak down test, or how can I narrow down the list of posibilities without removing the head?

 

[Money Maker]

btw the highest boost I have seen is 40

 

[JGheen]

1 hole in piston - No, you would definately know if there was a hole in the piston. I doubt your EGTs have gotten high enough for a long enough time to raise piston crown temp to the point of meltdown.



2 blow-by - Very much a possiblility depending on how high your EGTs have gotten as well as how long you left them at that high temp. Long periods of time @ high EGTs(say 1400+ @ 10+seconds) can scuff cylinder walls hence increasing blow-by.



3 valve seat leaking - More like a valve stem seal could be leaking due to the higher boost your running, but 40lbs isn't that much more and not enougfh IMO, to blow out a stem seal.



4 cooler egts not burning up all the extra diesel I am pouring in (doubtful but the easiest to live with) - very doubtful as the #6 cylinder is always the hottest since it is recieveing the lesser of the air entering the manifold through the intake tube.



How do you do a leak down test? - Leak down is performed by rotating the engine over until the cylinder being tested is @ TDC or the compression stroke. Then the cylinder is pressurized and the amount of cylinder leak is detected by how much air is escaping.



Joe

 

[Forrest Nearing]

if you were trying to tow with it, you could have gotten the EGT's a bit warm due to low boost... #6 is the hottest cylinder, so you could have scuffed a cyl wall... I had the head off my truck this past weekend and had a nice heat spot on the back of the cyl wall

 

[Money Maker]

highest egt I've seen is 1250'ish (maybe a little bit higher but not much) for a max of about 10 seconds maybe a couple of times it got that high. Edge backed down to 50% once but that was less than 5 seconds while I was watching to see what would happen.

 

[Money Maker]

Leak down is performed by rotating the engine over until the cylinder being tested is @ TDC or the compression stroke. Then the cylinder is pressurized and the amount of cylinder leak is detected by how much air is escaping.



Joe

Do you pull the injector or is there a port where you hook up a gauge?

 

[nickleinonen]

Could it have run me lean enough to have burned a hole in my piston?

diesels are lean burn... you won't burn a piston going lean. . if you get over fueling and high cylinder tempratures from overfueling, then you can burn a piston

Do you pull the injector or is there a port where you hook up a gauge?

pull the injector and install adapter tool. . [same adapter as compression reading adapter i believe]

 

[jwilliams3]

It could very well be a valve seat leaking.

To the untrained eye uncombusted fuel can appear to be oil.

 

[MMeier]

highest egt I've seen is 1250'ish (maybe a little bit higher but not much) for a max of about 10 seconds maybe a couple of times it got that high. Edge backed down to 50% once but that was less than 5 seconds while I was watching to see what would happen.

Where is your probe located?

 

[jwilliams3]

Where is your probe located?

..... ... . :--) :-laf

 

[MMeier]

..... ... . :--) :-laf

Get your mind outta the gutter Mr. ( yes, I'm using that term very loosely) Williams!!

 

[Money Maker]

Where is your probe located?

In the pre-drilled and tapped ATS exhaust manifold.



Is this a bad spot?

 

[Money Maker]

It could very well be a valve seat leaking.

To the untrained eye uncombusted fuel can appear to be oil.

How can this be checked? Do I have to remove the head?





If this is the problem, do you think the bigger turbo caused it? Seems to be more than a coincidence that it wasn't a problem for 200k miles and then within 3k of a bigger turbo it is leaking.



Where does the juice/attitude get it's boost reading and how accurate is it? Just want to make sure that actual boost isn't spiking above the reading I see on the display.

 

[RFlies]

The Edge can only read like 40-42 MAX. It is taken off a sensor so it can only read so high. There is a chance you could of gotten more boost than what was read if you have enough to push it that far.

 

[Money Maker]

how much boost can a sps 66 put out with me on #5?



How much can a sps 62 put out?

 

[Money Maker]

also is there a way to get a better reading using the edge? Do I need to install another sensor and where is it?

 

[Money Maker]

Update...



I have now driven about 2k miles with a 30K+ load, since I discovered the above mentioned problem. I still have a ways to go but a new development has occured along the way. At idle I now have a random blue/grey smoke coming from the tailpipe, also when this is occuring there is usually a bit of a rough idle. I assume this to be a "miss" and figure it has to be an injector.



ANYONE..... ANYONE... .



I'd just like someone to second that.







Thanks,

 

[Money Maker]

breaker breaker..... can I get a post check???



I'm not sure this thing is working.....

 

[RMalone]

If the blue/grey smoke doesn't smell like oil I would say injector (on that issue), especially considering your milage. I really can't imagine that your sps66 caused the problem since you only saw 1250deg for short periods of time.



If the edge is reading the stock sensor for boost you might try reading boost in the hollow bolt up near injector #1 (on the intake plenum), but 40-45lbs sounds about right, if not a little high, for boost with that turbo and fuel. I don't think that kind of boost is going to do any damage, quite a few guys have run up past 60lb on stock head gaskets/valve springs without issue.



Now if you have gotten that sucker way too hot with the stock turbo and the edge while towing then perhaps the added boost sent things "over the edge", I dunno.