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E7 injector lines cracking


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I've got a 1994 CH with the E7350. Back in December I replaced #4,5,6 injector lines. They were leaking at the head. Now 4 months later all three have failed with small hairline cracks behind the nipple at the injector. Mack has been warrantying the lines but I'm really growing tired of replacing them every few months. Yes, I make sure all the line clamps are good and tight. The lines stay dry for weeks, maybe months and then bam, they start dripping on the manifold.

My original lines were 0.25" OD, the new OEM ones from Mack are 0.23 OD I noticed. I let Mack know about this....

Do I have any other options here?

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a couple of the ones I service had the same issue..    I got pissed and took the little clamp plates out, and the issue stopped.  I think the newer lines arent as good as the original lines.  I think they may need to vibrate a bit without the metal clamp plates ,  i  dont really know, because I have a few other E-7's that havent leaked..  I expect a few opinions on this one..  jojo

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7 minutes ago, Joey Mack said:

a couple of the ones I service had the same issue..    I got pissed and took the little clamp plates out, and the issue stopped.  I think the newer lines arent as good as the original lines.

Interesting, maybe I'll try that when I finally get to the end of my rope on this.

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11 minutes ago, Joey Mack said:

a couple of the ones I service had the same issue..    I got pissed and took the little clamp plates out, and the issue stopped.  I think the newer lines arent as good as the original lines.  I think they may need to vibrate a bit without the metal clamp plates ,  i  dont really know, because I have a few other E-7's that havent leaked..  I expect a few opinions on this one..  jojo

New ones don't even look like the old ones.  One more thing Volvo couldn't care less about on older trucks.

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19 minutes ago, Joey Mack said:

  I got pissed and took the little clamp plates out, and the issue stopped.

 

7 minutes ago, Mark T said:

  I think they may need to vibrate a bit without the metal clamp plates

Not Mack related But in the same vein... 

40Yrs ago My father Bought a new 4240 John Deere Tractor, & one on the Fuel Lines Cracked. He got a new one under Warranty, But In the packet with the New line was a Diagram of where the Little Clamps needed to be to stop the harmonic Vibrations which caused the Cracking.

I remember that Factory Placement of the Clamps was Nowhere near where they Needed to Be according to the new Diagram...!!

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"Be who you are and say what you feel...
Because those that matter...
don't mind...
And those that mind....
don't matter." -

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mabey just for kicks. split some lengths of 1/4" fuel line and slide it over the lines...  I probably should have done that in the first place..  I guess mabey keep them away from the heat of the turbo, and manifold..  I dont really have a good answer..  Hayseed has good points though... jojo

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My old E6 keeps cracking number 1 injector line, maybe every 50,000 km, no apparent reason

No clamps and no diagrams of clamps and I have asked about clamps on here before but never got a answer 

Anyway the new injector lines are a lot thinner than the old ones, but the old one cracked to start with so I guess that doesn't mean a lot then

However I have never had any other diesel crack injector lines so dunno, must be just lucky I guess

 

Paul 

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The only other engine I worked on was a John Deere Dozer, and those lines were short, mabey 10" long if stretched out..  a couple of them sprung leaks at the nuts..  but thats all I can remember for now.,, jojo

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