87 300d engine knock....
Junior Member
Joined: May 2003
Posts: 26
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From: Reading, UK
C280
It may still be your injectors.....it appears that the replacement injectors are now made in India and are not built to the same standard as the original injectors.
From what I have read, it pays to get them checked out by a diesel injection shop who will be able to conduct a Pop test and check the spray pattern.
If you still have the old injectors and know which of them is a good one, it may be worthwhile swapping out an injector at a time until you find the bad one/one's.
From what I have read, it pays to get them checked out by a diesel injection shop who will be able to conduct a Pop test and check the spray pattern.
If you still have the old injectors and know which of them is a good one, it may be worthwhile swapping out an injector at a time until you find the bad one/one's.
MBWorld Fanatic!
Joined: Feb 2003
Posts: 1,414
Likes: 339
From: Charlotte, NC
Had: 1987 300TD, Had: 2004 C230 Sport Sedan, Have: 2014 E350 Sport, Have: 2019 S450
I second the opinion . . . have the injectors checked out again.
I had a similar situation. Knock was so loud that I thought I was going to be buying a new short block. Turned out to be one bad injector.
I had a similar situation. Knock was so loud that I thought I was going to be buying a new short block. Turned out to be one bad injector.
Thread Starter
Newbie
Joined: Oct 2004
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Actually the injectors, i had then reconditioned...
didnt put new ones in because it way over cost. Anyway I guess i'll be pulling the injectors because the clacking sounds like its only from one cylinder. How about 3 months old diesel? should it really make that big a differance? (still same diesel in tank as before i started the project, hmm)
thanks for your replys
thanks for your replys
MBWorld Fanatic!
Joined: Feb 2003
Posts: 1,414
Likes: 339
From: Charlotte, NC
Had: 1987 300TD, Had: 2004 C230 Sport Sedan, Have: 2014 E350 Sport, Have: 2019 S450
Originally Posted by jozsef61
didnt put new ones in because it way over cost. Anyway I guess i'll be pulling the injectors because the clacking sounds like its only from one cylinder. How about 3 months old diesel? should it really make that big a differance? (still same diesel in tank as before i started the project, hmm)
thanks for your replys
thanks for your replys
I watched the MB mechanic (I don't know squat about diesels) troubleshoot the knocking. He knew (from experience) exactly what the problem was.
He loosened the fittings where the metal fuel line connects to the injector, one by one. If the knocking didn't change, he tightened that fitting and loosened the next one. Sure enough, by the time he got to the fifth fitting, he loosened it, and the knocking stopped altogether. He then changed that one injector, and sent me on my way. Total time: 10 minutes.
NOTE: when loosening the fitting, a small amount of diesel will shoot out under high pressure! Wear eye protection, and be certain to clean it up afterward. I can't recall, but he probably had a shop rag draped over the injector and wrench while he was loosening/tightening the fittings.
Hope this is helpful for you.
