Replaced the injector nozzles on my 82 W123 Mercedes 300D in hopes of quieting down a strange metallic knock/rattle/ping I was concerned could be rod knock.

This engine was run for an unknown time with low oil pressure due to not having any oil in it thanks to the turbo drain leaking, which started flattening a lobe on the cam, and froze up the bearing on the vacuum pump.

I caught both just in time as there was no real metal fragments or anything seemingly wrong from a visual analysis of the oil. It had a strange little tapping noise, I tried a different set of injectors I pulled from a car in a junkyard, Wasn't smart enough to replace crush washers, seemed to help a little so we drove the car for quite some time, have done a few oil changes and that little pinging knocking sound hasn't ever really gotten worse but it hasn't seemed to go away either.

Decided to dig in and see what I could find.

We nearly immediately after making this video took the car about 100 miles, It seems the injectors are settling in very nicely, the car has quieted down and smoothed out quite a lot from where it was in this video.

Check your injectors, especially if they've never been serviced/rebuilt!


Key things in video:

0:00 Introduction
1:06 Starting engine before, listening to the noise, noticing bubbling from cyl2
2:16 Removing injectors to investigate the bubbling
3:25 Finding cyl2 injector wet and covered in carbon buildup
3:40 Cyl1 has carbon built up on one side of heat shield and around prechamber slightly
4:14 Some footage from pop-testing to show difference between a very bad injector (cyl2) and a decent injector (cyl3)
5:40 Crush washer was barely contacting cyl2 injector.
7:00 Rebuilding injector video coming later, In meantime, New DN0SD314 nozzles (Larger than stock = More power?)
7:30 Cleaning injector threads and crush washer mating surface in head with small brass brush
8:15 Installing new crush washers
9:00 Torquing injectors into head
11:05 All back together, bleeding air out of injector lines
11:25 Running on new injectors
11:50 Before and After comparisons
12:14 Test drive
13:00 Closing thoughts


Links to products used in this video: (These may be affiliate links so that I get a small commission if you choose to purchase any of these items from these links)
ACDelco Torque adapter: [ Ссылка ]
Powerbuilt 27mm Deep socket: [ Ссылка ]

Firad DN0SD314 Nozzles (One size larger than stock): [ Ссылка ]
Firad DN0SD265 Nozzles (Stock Nozzles): [ Ссылка ]
Crush washers: [ Ссылка ]

Things you need to use the gigantic primary "prefilter" that I have:
Filter housing: [ Ссылка ]
Mesh filter: [ Ссылка ]
Fittings: [ Ссылка ]
3/8 fuel line: [ Ссылка ]
Clamps for fuel line: [ Ссылка ]

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