I have been in the slow process of replacing injectors lately. I have had a nailing problem with the #6 injector. I replaced it and the nailing went away. Two weeks ago the nailing came back and the car runs rough at start up. I have used a stethascope and know the nailing is coming from the injector. I replaced it last week and it still nails. Could this have to do with the timing?

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Owen

87 300TD 603 I-6
94 Jeep XJ I-6 4.0 (see the pattern)
89 750il
seventy-two hundred feet above sea level (kinda cold up here)

Timing wouldn't affect just one injector. Having said that if you have never checked the timing before you probably should. Have you tried swapping the suspect injector to another cylinder and seeing if the nailing follows?

How does the pre chamber look? The ball should be pretty tight and it should be clean. Are you sure it isn't a lifter acting up?

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I have swapped the injector to a different cylinder and the nail goes away. I have not inspected the pre-chamber but know by cracking the injector line that it is the injector. The sound goes away when there is no fuel pressure on the injector. I had the timing checked but found the shop did not check it with the proper tools. He manually adjusted it and charged me a hundred bucks

What is the "ball" and what purpose does it serve?

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Owen

87 300TD 603 I-6
94 Jeep XJ I-6 4.0 (see the pattern)
89 750il
seventy-two hundred feet above sea level (kinda cold up here)

Its there to atomize the fuel. The injectors squirt a tight stream. When the stream hits the ball it atomizes out in all directions promoting an even burn in the prechamber.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

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When you loosen the injector line fitting on #6. Is the rpm drop the same as on # 5 when you do it? Should be almost identical with a good engine and everything in time. I would check the prechamber ball and see if the chamber is pretty clean as a preliminary step as well. Wondering if you might be having a delivery valve issue but do not know enough to comment. Engine used to run much better?

How many miles on the injectors. The nozzles are probably pretty much worn out if over 100k on them.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
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