Tightens and Removes Collar Nuts on 220D 240D 300D 300CD 300TD 300SD 300SDL 190D 2.2 1969 to 1987. Works on most Mercedes diesel engines up through 1987 only. ALSO FITS OM 636. Loose collar nuts are becoming epidemic on these old engines leading to air and fuel seepage around the base of the fuel injectors. They tend to loosen over time, especially when removing previously over-torqued fuel injectors! Free instructions included by watching the video below:
Product Details
This important collar nut is torqued to between 100 and 120 foot-pounds to provide the proper seal between the pre-chamber and the cylinder head. There is no way one can put that amount of torque and a twin-notched nut like this without using some type of clamp to secure the socket to the nut. This prevents the socket from "jumping" out of the notches during tightening or loosening.
The threaded insert part of the tool is screwed down into the pre-chamber. With the notched socket seated tightly against the collar nut, a 32 mm socket and wrench is used to tighten or loosen the collar nut. In most cases just tightening the collar nut will solve most pre-chamber leak problems.
We also have another all-chrome version from Europe that will do the same job. Please see the related products below.
ALSO NEEDED: You will need a 32mm socket to turn the wide shoulder of this tool. An open-end or adjustable wrench is very difficult to line up with the tool with the engine in the car. If you do not own this socket you can order online or purchase from us below:
IMPORTANT REMINDER: This tool will only tighten and remove the collar nut. It WILL NOT remove the pre-chamber. If tightening the collar nut does not solve your leak problems, then you may have to remove the pre-chamber to install a new sealing ring under the top lip of the pre-chamber. The pre-chamber removal tool is available separately. Look below to order. prechamber
Related Products:
1965 To 1987 Diesel Prechamber Collar Ring Nut Removal Tool
This tool is required to remove the prechambers in the OM 615, OM 616, OM 617, OM 601, OM 603 four, five, and six clyinder diesels through 1987 ONLY! Easy tool to use.
1968 to 1987 4, 5 and 6 Cylinder Diesel Engine Prechamber Removal Tool
Version 4 update 2/22: New color and style but still does the same job. This is one of the key tools you will need to remove stubborn pre chambers from the cylinder head of your old diesel engine.
617 Turbo Diesel Engine Prechamber (USED)
Excellent used pre chamber as shown for OM 617 turbo diesel engines ONLY. If your diesel engine is running rough with excessive smoke and you have tried everything else it could be your engine's pre-chambers are damaged.
615 616 617 Early 601 and 603 Diesel Engine Prechamber Collar Nut - USED
This is a genuine Mercedes used part. These are much stronger than the aftermarket ones available. Genuine are no longer made. No damage to the slot or the threads. Only for models listed. Does not work on later aluminum diesel engines. Collar nut holds pre-chamber in cylinder head.
32 mm 1/2 Inch Drive Socket - Chrome
VERY high-quality socket as shown.