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#1
10-30-2008, 07:09 PM
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Leaking Fuel Injector
After investigating what I thought was a leaking valve cover gasket, I have concluded the I have a fuel leak from the base of the #1 fuel injector. (The leak is definitely not from the return lines or from the injector "joint.") As the engine runs, I can see fuel well up slowly from the base of the injector where the injector threads in to the combustion chamber.
I suppose that the next step would be to remove and inspect the injector, then replace the seal and reinstall the injector. But, before I start taking things apart, I was wondering if anyone has any experience with this particular problem. I have never removed any of the injectors, making it highly unlikely that they have ever been removed. '82 300D, 152k miles. 
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#2
10-30-2008, 07:56 PM
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Try tightening the fuel supply line on that injector...
__________________
Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles
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#3
10-30-2008, 07:57 PM
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I had the same problem and in spite of my confidence in the correct source of the leak, I was wrong. It was the return lines. For very little $ or time, replace those and report back. I'm betting the leak is gone!
__________________
Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386
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#4
10-30-2008, 08:08 PM
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I have already confirmed that the fuel is not running down the injector. The leak is not from the return lines or the supply line.
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#5
10-30-2008, 09:37 PM
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I had a similar problem on my 300SD, and I replaced the injector which cured the problem. I ruled out the line and the rubber hoses. Leaks can be tricky to pinpoint sometimes.
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#6
10-30-2008, 11:11 PM
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Interesting problem. I just fixed 3 of mine that were leaking from the threaded "joint" where the collar around the nozzle screws onto the body of the injector. If it isn't leaking there, OR at the rerurn lines, OR at the injector line nut, then where the injector screws into the head is pretty much the only place that's left - unless maybe the nozzle collar is cracked.
If that's not it, then part that so hard to understand is that under those threads (inside the prechamber) there shouldn't be any fuel in a liquid state. For fuel in the prechamber to get past those threads the atomized fuel from the injector tip would have to be returning to a liquid state and being pushed out past the threads by the engine's compression. As in condensing around the threads and then being pushed past them by the compressed gas in the cylinder. Is the fuel at the injector/head interface "bubbly" - e.g. mixed with air? What quantity of fuel are we talking about here? Drops? Enough to run down the side of the block and drip onto the ground?
__________________
1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown
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#7
10-30-2008, 11:24 PM
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Quote:
Quote:
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#8
10-31-2008, 02:47 PM
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I'd say pull that injector and look for cracks in the nozzle holder ring.
But that's just a thought - I'm far from an expert.
__________________
1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown
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#9
10-31-2008, 10:16 PM
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Quote:
__________________
83 SD 84 CD
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#10
11-01-2008, 01:33 AM
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Quote:
Because what I'm talking about is the threaded collar surrounding the nozzle and securing it to the injector body... Don't see how it could be the prechamber itself - though maybe a cracked or loose securing ring that threads into the head on top of the prechamber might be the problem - since the injector screws into it.
__________________
1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown
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#11
11-01-2008, 05:32 PM
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Quote:
I don't understand how it can suddenly start leaking tho. Good luck.
__________________
83 SD 84 CD
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#12
11-01-2008, 05:58 PM
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Firt thing to do is to fit a NEW 'heat-shield'/seal washer....
10-1, That will cure the problem 
__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg Alastair AKA H.C.II South Wales, U.K. based member W123, 1985 300TD Wagon, 256K, -Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.  W114, 1975 280E Custard Yellow, -Great above decks needs chassis welding--Really will do it this year....
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#13
11-01-2008, 09:17 PM
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Quote:
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#14
11-01-2008, 10:59 PM
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Quote:
At this point, a cracked injector seems to be the only plausible cause of the leak. Given that the leak is not catastrophic, further investigation may have to wait.
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#15
11-02-2008, 07:01 AM
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Although it seems unlikely to me, I'd also take a shot at that heat shield..........it's quick and easy to rule it out.
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