noticed #3 line "seeping" at injector yesterday. researched on the net and
tried the following:
loosened the brackets securing the line, than I backed it off. the nut was a
little over finger tight, wiped with a clean rag to feel for corroding or
breaks. re tightened, torque to 24 ft lb. so far seems ok, but it was still
"wet" around it where the rag wouldn't reach when I got in tonight.
anyone got similar? what did you do to fix it?
It's the line that feeds the injector that's leaking - not the injector
itself. That's a flare fitting - no O-ring. The injectors themselves use
sealing washers, not O-rings, at their tips. O-rings can't handle the
1000's of PSI in those lines.
It's not uncommon for those fittings to loosen up over time... just gotta
torque 'em down again, and the leak should go away. At worst, the line
would need to be replaced. Again - not a big deal to do.
Alright... I will...
Yes, there's an O-ring on the injector. Yes, it should be lubricated prior
to installation. No, it has absolutely NOTHING to do with preventing fuel
from leaking - it has everything to do with keeping dirt and debris out.
The seal between the injector and the cylinder is done with a copper sealing
washer. The seal between the injector and the fuel line is done with a
flare fitting - no O-ring. In a diesel engine, none of the seals where fuel
could leak out (at least on the high pressure size) are done with O-rings.
Therefore, for a leaking injector, changing any O-rings is a complete waste
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