Anybody got an idea of about what the cost would be to replace fuel injectors in a Cat 3126-B? Oil is getting in my fuel tanks. I've been told that it is bad injector o-rings and the only way to assure that it's fixed is to replace all the injectors. Any advice would be greatly appreciated. The truck has 483000 miles on it. It was rebuilt at 300000 by the previous owner. I've had it 2 years. I have to ad a gallon of oil about every 700 miles. It is slowly getting worst and losing power. Thanks again for any help.

 

Have you even had in to a Cat shop?

 

It's never been in a Cat shop

 

Personally, I would do injector o-rings first, looking for signs of damage on each of the rings as they're removed.

If that doesn't work, the injectors must be replaced. As far as I know there is still no way to pinpoint the faulty injector. Air pressure applied to the high pressure oil manifold will tell you that you DO have a leak from the hp oil side to the fuel system but will not tell you which injector, or if the leak is internal (inside the injector) or the injector o-rings.

The problem with doing o-rings first is that IF it doesn't repair the problem, you have to do it all over again with the new injectors. On the other hand, if you replace the injectors first time in... you're done, but obviously costs much more for parts.

Keep in mind, if you choose to "gamble" and try replacing o-rings only, it will take several tanks of fuel to clear up the black fuel syndrome.

 

Injectors for my 3406E were $465.00 each, over the counter, and you have to give them the old ones.

Its around a $3400.00 job, at least for the E series.

 

If you pull the injectors, for the o-rings, don't forget the copper crush gaskets for the injector tips.

They should be able to do something called the cylinder contribution test (or their equivalent) which basically turns on and off each injector and tells how much that cylinder is adding to the total power.

Best of luck with it.

 

His symptom is oil in the fuel... not misfire.