12.7 detroit smoking and rattling
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 4noReason, Jun 15, 2022.
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Rideandrepair Thanks this.
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they gonna replace injector 5. even tho i drove 20 miles on it smh. but they can warrranty it. so no charge for part. then he will dyno it. what are odds. the new 5th injector was a DUD i dont beleive it. im skeptical but i have to trust them.
Rideandrepair and Magoo1968 Thank this. -
I hope they're right. Wiring issues, fuel return blockage, and timing issues are pretty well dismissed.
The only things left are injector and valve, piston issues.
I have little faith in even the big shops. One of the local counties called me about three years ago with a similiar issue on a Cummins. Freightliner a 1/4 mile from ny shop had this truck three months.
Replaced injectors, injector harness, turbo, and EGR valve. Still not fixed, they used the excuse that it had been deleted to say they couldn't work on it, and charged them 17k.
They brought it to the shop. Cylinder c/o showed the suspect cylinder. Pulled valve cover and rolled the cyl tdc. No interference from rockers (no jakes). Pulled rockers and found 1 exhaust valve 1/4"" lower than all others.
Seriously took less than an hour to diagnoseLast edited: Jun 28, 2022
Rideandrepair, nikmirbre and 4noReason Thank this. -
Rideandrepair Thanks this.
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Very common on cat to have to go through multiple injectors to find 6 good ones .. I’d suspect Detroit is probably getting to that stage as well .. nowadays many guys won’t change injectors on a inframe unless they know old ones are bad .. new ones are a crapshoot
Rideandrepair, spsauerland, jamespmack and 1 other person Thank this. -
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Rideandrepair Thanks this.
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Dod you replace them yourself, or do you have a mechanic capable of that?
4noReason Thanks this. -
Rideandrepair and Big Road Skateboard Thank this.
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