Weeping injector

[stevensuf]

So after our engine went mad and overran, we replaced the leaking lift pump and engine is starting and running ok albeit a bit smokey, now ive found one of the injectors is weeping ever so slightly at the seat. so do i try a rebed and possibly open a can of worms, or just go with it?

[model 10]

No , pull it out and put on a new seal. If you are out in the boonies and can't buy a new seal, anneal the old one.

[stevensuf]

Im just worried about making it worse, old head and all!

[Cheechako]

Hard to say without getting it out. Hopefully you can find a new seal. That should do it.

[stevensuf]

so any opinions on carrying on with it weeping slightly?

[dannobee]

Where exactly is it "weeping?" Can you describe it?

[model 10]

It will not get better. Think twice about carrying on with a fuel leak.

[boden36]

Best advice is to remove it, clean the seat, replace the washer and re tighten.
You could try loosening the hold down nuts and retightening to the correct torque but once it has started leaking it will probably only get worse.

Regards,
Richard.

[stevensuf]

small pinhole leak at the seat of the injector, caused by engine over running, ie runaway for a short period of time!

[model 10]

Originally Posted by stevensuf

small pinhole leak at the seat of the injector, caused by engine over running, ie runaway for a short period of time!

I think that idea may be your imagination running wild. The rpm probably sounded crazy but probably was not.

[stevensuf]

the weeping injector was caused by a faulty lift pump allowing unmetered diesel/oil mix into the system,causing the engine to over rev/overheat like mad before we could stop it, i drained 7.5 litres of fuel from the sump after the event.

[model 10]

Did you see the tach? I'm sure it sounded insane whatever the rpm was. I don't think the rpm caused the leak, perhaps the temp did. The copper gasket under the injector has lost it's malleability and the expansion from the high temp has caused it to leak. A simple re-torque might work.

[stevensuf]

the tacho was over the max reading for the whole episode, we were lucky to stop it before it revved itself to death! im with you on the copper, but tried tightening it with no avail.

[bobconnie]

If it were me, I would buy a 1/2 a dozen seals for your injectors, replace the leaker, and keep the others as spares. Because if heat caused the leak, you may have some more start sooner or later ! Just a thought, cus any fuel leak can become a bad problem!! And I hate the smell of diesel in my boat !! LOL

[sww914]

Some of the cars that I used to work on used copper exhaust gaskets against the head. From time to time they were unavailable so here's what I would do (drawing on the anneal idea above) I would sand them with 80 grit stuck on a very flat surface, then 220 grit, and then heat them with a propane torch until they were red to anneal (soften) the metal,and then reinstall them. 100% success.
My flat surface was a thick piece of glass that I bought just for things like that. I used sticky backed sand paper and it worked great.