LB7: Diesel Driven Performance LB7 build

[dirty_maxxbob]

Okay so I'm trying this out thread thing out for a build I'm doing. Truck is a 2003 CCSB 4x4 with 289,000 on it. Truck came in for a "blown head gasket" well since I've torn it down I found more then just that. The customer stated it loped (which it did) would also loose prime and also had slight haze. So once I got the valve covers off this is what I found.

This is the worst out off all 8 injectors, but they all had somewhat looked similar to this. By now I was like wow I wonder what other sunrises I'll find, well once I got to pulling the injectors out all the cups came out with them and I wasn't to surprised by this. So now I'm braking all the head bolts loose and they seemed to be a little to tight. The Allen head 8m bolts where at 24ish ftlbs and the actual head bolts not studs where at 88 degrees. So I was right they where all over torqued.


More to come in a few hours!


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[clrussell]

Wait what?? The Allen bolts torque to 25ft lbs..

The head bolts should be about 125-145 depending on the sequence used..

 

[IOWA LLY]

The injectors look that because of the crap that fell in them after you removed the high pressure lines..... I love how everyone is so surprised/intrigued by this.....lol.

And I assume your talking about "break away" torque on the Allen head bolts? Believe me, they weren't over torqued from the factory. I guarantee that.....

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[IOWA LLY]

And the cups coming out with the injectors means absolutely nothing at all other then the tips of the injectors are probably sooted up. The cups are held in only by some loctite.....

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[dirty_maxxbob]

The injectors look that because of the crap that fell in them after you removed the high pressure lines..... I love how everyone is so surprised/intrigued by this.....lol.

And I assume your talking about "break away" torque on the Allen head bolts? Believe me, they weren't over torqued from the factory. I guarantee that.....

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This truck was previously done by another shop and trust me the HP lines are clean, I wouldn't start taking blows at what im finding lol. The person who's owned the truck hasn't changed the fuel filter in it since he's owned it. Whats on the tops of all the injectors is pieces of the broken down fuel filter. Tomorrow I'll take a few pictures of the mangled fuel filter. I had to use PB blaster and a pry bar to brake all the cups away from the injectors. This was the only picture I got of the injectors before I dropped them off at SoCal Diesel along with the trashed cylinder heads a little bit ago.

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[IOWA LLY]

I'm not taking blows at anyone.

But that debris was not in the inlet of the injectors until you removed the lines.....

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[dirty_maxxbob]

Your correct but most of it was already in them already. Guys at Socal couldn't believe the truck still ran after they saw the tips on the injectors. Wish I could have gotten more pictures but time wasn't in my side.


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[Chevy1925]

If that stuff was actually in the rails and in the injector, the truck would not be running due to stuck open or closed injectors let alone a dead cp3.

Moisture accumulates up under the hard line and rusts the injector threads as well as the hard line. New lines or clean lines, the injector end can rust and have crap fall in when you remove the hard line.

I'm also not sure how you can tell the degree the head bolt was torqued to cause the factory does not mark them from initial setting. Stock head bolt torque sequence is 37ft lbs, 59ft lbs, 60*, 60* so a total of 120* after final torque. Reusing a head stud to check to see where it actually degreed isn't accurate as they are torque to yield. So if anything based on what you are saying, the head bolts were loose, not over tighten

 

[dirty_maxxbob]

If that stuff was actually in the rails and in the injector, the truck would not be running due to stuck open or closed injectors let alone a dead cp3.

Moisture accumulates up under the hard line and rusts the injector threads as well as the hard line. New lines or clean lines, the injector end can rust and have crap fall in when you remove the hard line.

I'm also not sure how you can tell the degree the head bolt was torqued to cause the factory does not mark them from initial setting. Stock head bolt torque sequence is 37ft lbs, 59ft lbs, 60*, 60* so a total of 120* after final torque. Reusing a head stud to check to see where it actually degreed isn't accurate as they are torque to yield. So if anything based on what you are saying, the head bolts were loose, not over tighten

For my 88* number I got, I knew it was 60* so all I did was set it at 60 and push till it barley moved. The truck when it showed up to me couldn't idle lol was loping and he was raving it to keeping it running. Poor truck has been abused and not takin care of at all.


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[THEFERMANATOR]

You cannot measure torque to yield bolts. You can set 20 all the same, and each one will move a different amount or be at a different torque from each other. They work great on an assembly line as they are forgiving sincde they stretch, but this forgiveness is why they are not good for performance use. Your measurements prove nothing from what you're describing. And if there was in fact that much debris inside the rails, it would not have run. Anything more than about 5 microns can hang one wide open, so that much stuff would have just hydro locked the engine from the injectors hung open. What you're seeing is why people do NOT buy used LB7 injectors as no matter how hard you try, this crap will get down into the injector inlets as soon as you take the lines off.

 

[Ne-max]

A little heat from a propane torch and those cups will fall right off.

 

[Robby05]

As stated above that debris isn't abnormal. What was wrong with the heads?

 

[dirty_maxxbob]

As stated above that debris isn't abnormal. What was wrong with the heads?

Where Warped pretty bad, had few valves were slightly stuck open. And most of the valve cover bolt holes where stripped out and the Allen bolts where held in with rtv lol also had some sludge in spots.


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[dirty_maxxbob]

A little heat from a propane torch and those cups will fall right off.

I used some PB blaster, heat and a little strength, them suckers came right off!


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[clrussell]

I'll be the ahole to post this..



I realize this is probably your first "thread" and your proud of what your doing.. But don't treat us like we don't know what's going on. Id say 95% of us here have put headgaskets and injectors in an lb7..

This isn't facebook, you don't have to post a line of b.s. and if you do someone will catch it..


It's Friday and I only have 8 hours of work left till the weekend. I'm out

 

[Rancelot211]

Lol no welcome sign!^