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Old 02-04-2011, 09:18 PM   #1 (permalink)
kklonghorns
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lb7 injector failure cause?

I was talking to a mechanic that works on diesels and specializes in GM engines who claims to be really smart and know everything about every diesel engine that ever went into a truck. He claims that the lb7 injector problem is caused a seeping head gaskets that let water seep into the injectors which causes them to corrode and fail. He claims the cure is to replace the head gaskets with new factory gaskets and the problem will be solved. Does any one here know any thing about this or is this guy full of brown gooey stuff?


He sez the new 6.7 powerstrokes will have valvetrain failures at 60k to 80k miles because they put too heavy valve springs in them and too light rocker arms.
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Artificial insemenation of cattle is like a Congressional vote----the constituency isnt told what is happening to the, they can't get away, most of the vital damage is done in a dark place, the administrator is not affected by the act, and months later shockingly irreversible. Darol Dickinson
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Old 02-05-2011, 12:12 AM   #2 (permalink)
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I'm throwing the BS flag on this one. Coolant doesn't contact the injectors, nor would a bad head gasket cause coolant to get inside the injector. The end of teh tip maybe, internally no. Even a leaking injector sleeve wouldn't allow coolant inside the injector. The general consensus is teh LB7 injector was just a poor design from the get go, and there isn't really much you can do for them hence why GM came out with the LLY.
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Old 02-05-2011, 05:57 AM   #3 (permalink)
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When someone claims to know everything,he's an idiot.

The root cause of lb7 inj failure is...Bosch overlooked shitty fuel and did not build the ball/seat robust enough and gm overlooked it with weak filtration...and a lift pump would have helped also.

and before anyone hollers about other brands being better...Dodge has the same problems (but they do have a lift pump) and Fords are just so shitty the injectors oulast the engine

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Old 02-05-2011, 10:35 AM   #4 (permalink)
kklonghorns
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He showed me a few gaskets where it was obvious that coolant was seeping to the injectors. He said it is normally slow enough that most people don't even realize that they are loosing coolant.

He also claims Ford is paying GM for the design of the new power stroke.
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Artificial insemenation of cattle is like a Congressional vote----the constituency isnt told what is happening to the, they can't get away, most of the vital damage is done in a dark place, the administrator is not affected by the act, and months later shockingly irreversible. Darol Dickinson
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Old 02-05-2011, 11:01 AM   #5 (permalink)
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Just curious, but how many sets of injectors has he done, and how many have failed again after he's done them?
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Old 02-05-2011, 12:45 PM   #6 (permalink)
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What do you mean he showed you where coolant was contacting the injectors?

That is not possible.

The only thing the coolant touches is the injector cup, the injector is inside the cup and the coolant cannot come in contact with it even if the seals failed.
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Old 02-05-2011, 12:53 PM   #7 (permalink)
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I highly doubt that G.M. would have helped Ferd with the design of the new powerjoke. This guy sounds some young punk kid that does'nt know his ass from a hole in the ground.
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Old 02-05-2011, 01:00 PM   #8 (permalink)
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So if new factory gaskets "fix" the problem, why do they fail in the first place? That just doesn't make any sense.
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Old 02-05-2011, 01:31 PM   #9 (permalink)
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Quote:
Originally Posted by DuraTitus View Post
What do you mean he showed you where coolant was contacting the injectors?

That is not possible.

The only thing the coolant touches is the injector cup, the injector is inside the cup and the coolant cannot come in contact with it even if the seals failed.

This is what I put in my post, there is just no real physically possible way for callant to get into the injector. Maybe he is thinking of the water and such that runs down the injector line and corrodes the seat where the line seals, but this isn't a cause of it either.
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Old 02-05-2011, 01:39 PM   #10 (permalink)
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Bad injector and no balance rate

So I have a friend that has a 2001 that had #3 injector go bad,his balance rate was 0,it was smoking bad and a lot of rattle,he turned off one at a time and found #3 stoped the smoking and rattling,I did not know that the balance rate would go to 0 when a inj. went bad ? have others seen this ?
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