injs leak at seals

[dmaxx3500]

guys ,a customer just replaced the 8 inj's himself ,now he has fuel leaking ,he used the old o-rings at the inj's and feed tubes, i haved worked on duramax's ,but never worked on a 6.2-6.5,how would guys recomend starting this,just take apart again and replace the o-rings?

 

[chrisk1500]

Those copper rings are a one time crush ring....

What is a feed tube? Return lines or IP lines?

If return lines, replace with clampless style...many vendors carry the kit for a few bucks...

 

[matuva]

Did he replaced the injectors with new or reman ones? Did he tight them at the proper torque value?

 

[dmaxx3500]

i guess i just need to remove all 8 and replace the copper washers and the rubber lines

 

[Turbine Doc]

Also find out where he got his "new injectors", some ebay remans & china injectors leak at the body right out of the box,

 

[chi2]

I am thinking that the the fuel lines (from IP to injectors) were not tightened properly or the rubber return lines (including the rubber caps) were not properly fastened onto the injectors.

Actually, this is more of a question: If there was a leak coming from where the injector body threads into the head, would this cause some serious mis-firing or other very noticeable engine problems? It seems that a leak at the injector body would produce many noticeable problems in addition to the fuel leak, whereas a leak at the return lines or fuel lines would not result in a loss of cylinder pressure.


Jon

 

[sshewins]

Is it a huge problem to have fuel leaking from the injector itself, I mean not copper O-ring, not the return line, not fuel line from IP, but where the two halves join together? How big a deal is it to fix that? (sorry bout the hi-jack - its sorta related)

Thanks,

 

[bison]

a leak at the line connection can cause stumble at idle.nut not tight or damaged line tip or injector cone.
A leak at the copper washer causes compression leak.
if a return hose leaks,cut of short piece and put it back on,i never use them stupid little clamps nomore,never had a leak yet.
a leak at the injector body requires disasembly and lapping of the body top and both sides of the coned washer.this can be done with crocus cloth on a piece of glass,and some diesel fuel as lubricant

 

[bison]

Those copper rings are a one time crush ring....

What is a feed tube? Return lines or IP lines?

If return lines, replace with clampless style...many vendors carry the kit for a few bucks...

Chris, you can revitalize these copper washers by heating them cherry red and dunking them in cold water. makes them new again.

 

[sshewins]

Thnks Bison, I'll experiment with an old inj I have lying around.

 

[JMJNet]

$6.99 for 120 various sizes at China Freight.