Bubbling around injector
 

My #3 injector is bubbling around the base. It's tight (35). Is there a seal or something I need to change?

83 300SD 173K

Injectors have washer seal. Are you sure its not bubbling from pre chamber

My experience is that bubbling is often the prechamber (washer/seating problems just leak). Replace or clean and reseat the washer and retorque the injector. If you're still bubbling it's the prechamber.

How would you correct the problem if it is the prechamber?

Just did this recently. The pre-chambers have a seal ring on them and are held in place by a screw collar. Two special tools are required for this job- a wrench to remove the slotted screw collar and a puller with the proper threads to screw into the pre-chamber. A slide hammer is usually used with this tool as the pre-chambers get "locked" into place from exhaust residue. They can require several heavy slams of a slide hammer to pull/remove. The pulling adapter costs about $40(without the slide hammer) and the wrench is $75ish. I think there is a thread on here that had a solution for the threaded adapter (?) But the wrench is almost a must have as the collars are torqued at up to 130ft. # ,and if a little rusty ,can be very difficult to remove.

Remove the parts.(glow plugs must come out first) Clean things up. (use a shop vac with a small hose duct taped on the end to vac out the cylinders)Replace chamber seal rings and injector seals(I use liberal amounts of anti-seize compound on the screw collar threads) sweat the details, and that should do it.