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New guy, blown head gaskets

WarWagon said:
IMO the GMx turbos are fuel wasting scrap metal. :yuck: There are far better performing turbo's out there above and beyond the large turbo I run. A start is the article below and many other discussions of other turbos abound on here.
http://www.maxxtorque.com/2012/07/the-65l-diesel-factory-equipped-asthma.html

FYI Pre-cups are almost a forgotten black art. Different precups will make the engine run like it needs a tune up: severe bolt loosening vibration that may be bad enough to break the crankshaft. Precups control the flame entering the combustion chamber as far as speed, when peak pressure happens, fuel limits, economy, emissions, etc. Different precups would be like firing one side of the engine several degrees off the other side and this would vary by load and throttle. The smaller precups can even hit their limits with fuel blowing so fast they centrifugally separate the air fuel charge: thus you have half the engine making more power while the other half smokes black. (I doubt you are pushing that much fuel w/o a turbo upgrade.)

You absolutely got lucky with getting a pair of diamond precup heads. :woot:
Click to expand...

I'm well aware of how bad GMX turbos are but, like I also mentioned earlier, I don't have the funds at this point to upgrade it. I'm happy I found one for relatively cheap so that I can at least get back on the road. It being worn out was an unexpected expense. I mean, I was expecting some extras, just the turbo wasn't one of them. Replacing both heads was unexpected also, still can't believe I lucked out there.

Anyway, thanks to everyone that contributed, I couldn't have done this without you guys. I'm going to start putting everything back together tomorrow once the gaskets & bolts come in.
 
6.5L said:
Actually Husker65, crank failure was not an issue at all, crank held strong with no problems. I just updated my carnage thread accordingly to reflect my thoughts, so as not to complicate this thread
Click to expand...
Sorry, case of Oldheimers again. After the Edit time limit expired I remembered it was a rod failure that barfed your engine. Speaking of which, did you ever determine what caused that rod to break?
 
Somehow the need to satisfy everyone's curiosity outweighs the risk of hearing the approximately 30 "I told you so's" I'm expecting...

Here's the driver side heads.

#7 piston is fine, no sign of damage at all20170421_164307.jpg20170421_164317.jpg
 
Newguy1998 said:
Somehow the need to satisfy everyone's curiosity outweighs the risk of hearing the approximately 30 "I told you so's" I'm expecting...

Here's the driver side heads.

#7 piston is fine, no sign of damage at allView attachment 49918View attachment 49919
Click to expand...
Interesting, you don't have a brown cylinder in that head. Maybe you have something there with your injector theory. Are you going to have your injectors tested?
 
Ya made the right call yanking that.

Man that precup!!! I have seen worse, but never just one big chunk gone and no little fissures or adjoining cracked precups. That 1 precup alone was worth it. Even with perfect injectors, that cylinder would have sucked the whole time.

Make sure your injector builder sets the pressure to within 25 psi of each other. What pressure are you having him set them at?
 
Will L. said:
Ya made the right call yanking that.

Man that precup!!! I have seen worse, but never just one big chunk gone and no little fissures or adjoining cracked precups. That 1 precup alone was worth it. Even with perfect injectors, that cylinder would have sucked the whole time.

Make sure your injector builder sets the pressure to within 25 psi of each other. What pressure are you having him set them at?
Click to expand...

I'll talk to them on Monday. Not sure what pressure they'll set them too. What should I tell them?
 
All memory here- and I have been making more errors lately- double check me ...
Around 1850 is stock n/a and 2050 is stock for a turbo.
-With german made bosch 303's or 311's you can get away with more pressures across the board and have no issues is the rumor, idk if it is true. 2350 was my normal run before. With India bosch or delphi and the like, I would think keep the numbers more around 2200-2250 if you accept that theory. The Germans are known to be good for 50,000 miles more life than the others before pintle wear affects spray (that is the real reason I hunted for them).

AK Diesel Driver is a more level headed guy than me for daily drivers, and just did his- so I bet he had some good time in research and reasoning why he set his where he did. Any input @ak diesel driver ? I know you mentioned on a thread somewhere, but I cant find it, and also believe you have 311 German Bosch for all your rigs now. Also- maybe you should sell some steel shims now that you can make them...hmmm.:greedy:


Also- find out what nozzles they are using to rebuild yours with Newguy1988- if they dont know or won't tell you- I would hesitate greatly. I would rather unbalanced new bosch from india than chinese specials- many loose them in 30,000 miles.
 
Will L. said:
All memory here- and I have been making more errors lately- double check me ...
Around 1850 is stock n/a and 2050 is stock for a turbo.
-With german made bosch 303's or 311's you can get away with more pressures across the board and have no issues is the rumor, idk if it is true. 2350 was my normal run before. With India bosch or delphi and the like, I would think keep the numbers more around 2200-2250 if you accept that theory. The Germans are known to be good for 50,000 miles more life than the others before pintle wear affects spray (that is the real reason I hunted for them).

AK Diesel Driver is a more level headed guy than me for daily drivers, and just did his- so I bet he had some good time in research and reasoning why he set his where he did. Any input @ak diesel driver ? I know you mentioned on a thread somewhere, but I cant find it, and also believe you have 311 German Bosch for all your rigs now. Also- maybe you should sell some steel shims now that you can make them...hmmm.:greedy:


Also- find out what nozzles they are using to rebuild yours with Newguy1988- if they dont know or won't tell you- I would hesitate greatly. I would rather unbalanced new bosch from india than chinese specials- many loose them in 30,000 miles.
Click to expand...

ak diesel driver said:
I set mine at 2200 ,unlike what Will said I was swayed by the many years on the forum where many people were setting them there for better atomization.
Click to expand...

I'll look into that tomorrow.

Hey, sooo...
What really causes the cups to wear like that? Excessive egts? Injectors? :sour:
 
Messed up injector stream is what I would blame that one grand canyon cut on. When they go from mist to stream, then hitting that inconel precup glowing at 1500 degrees, that could cut it.

I really think you're lucky there isn't a hole in the piston. Infact, go look at the top of that piston closer and compare to the one next to it.
 
20170426_161918.jpg
Will L. said:
Ya made the right call yanking that.

Man that precup!!! I have seen worse, but never just one big chunk gone and no little fissures or adjoining cracked precups. That 1 precup alone was worth it. Even with perfect injectors, that cylinder would have sucked the whole time.

Make sure your injector builder sets the pressure to within 25 psi of each other. What pressure are you having him set them at?
Click to expand...

Sorry guys, got busy at work...
Injectors are set at 2100psi

Got the left side heads ready to go on. Hope to have her running by the weekend
 
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