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Old 01-06-2013, 12:56   #1
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Weeping injector

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?
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Old 01-06-2013, 13:28   #2
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Re: Weeping injector

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.
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Old 01-06-2013, 14:06   #3
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Re: Weeping injector

Im just worried about making it worse, old head and all!
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Old 01-06-2013, 14:26   #4
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Re: Weeping injector

Hard to say without getting it out. Hopefully you can find a new seal. That should do it.
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Old 01-06-2013, 16:09   #5
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Re: Weeping injector

so any opinions on carrying on with it weeping slightly?
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Old 01-06-2013, 18:00   #6
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Re: Weeping injector

Where exactly is it "weeping?" Can you describe it?
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Old 01-06-2013, 18:03   #7
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Re: Weeping injector

It will not get better. Think twice about carrying on with a fuel leak.
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Old 01-06-2013, 19:35   #8
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Re: Weeping injector

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.

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Old 01-06-2013, 20:15   #9
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Re: Weeping injector

small pinhole leak at the seat of the injector, caused by engine over running, ie runaway for a short period of time!
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Old 01-06-2013, 20:22   #10
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Re: Weeping injector

Quote:
Originally Posted by stevensuf View Post
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.
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Old 01-06-2013, 20:35   #11
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Re: Weeping injector

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.
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Old 01-06-2013, 20:44   #12
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Re: Weeping injector

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.
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Old 01-06-2013, 21:01   #13
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Re: Weeping injector

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.
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Old 01-06-2013, 21:14   #14
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Re: Weeping injector

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
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Old 01-06-2013, 21:23   #15
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Re: Weeping injector

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.
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