5-Cylinder OM617 Mercedessource Diesel Fuel Injector Nozzles w/ Heat Shields

FREE full replacement and testing manual included in PDF format. For 300D 300TD 300CD 300SD—This part fits all 5-cylinder non-turbo and Turbo Mercedes diesel engines from 1975 to 1985. It is the critical inside wear part of the injector that delivers the fuel spray into the cylinder. 

These are direct replacement nozzles that fit perfectly in the Bosch Fuel Injector holders, and as you have seen in the video, there is hardly any difference in fuel delivery or the actual spray patter. You can replace just the nozzle for better fuel economy, more power, easier starts, and less exhaust smoke. FREE HEAT SHIELDS INCLUDED! 12-month warranty provided by Mercedessource when all assembly precautions are followed (as detailed in included PDF instructions).

PLEASE NOTE: Our written and video instructions, as well as our older YouTube videos, will refer to these nozzles as Monark. Monark has gone out of business and they are no longer being made. This is your last and best chance to actually obtain nozzles that are made in Germany.

Partial instructions are included - covers installing new nozzles in injection holders - but does not cover removal from engine or injector pressure balance testing.

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How to view the PDF digital instructions:

Once you complete the purchase of this product you will be able to download the digital instructions immediately when you are logged in and on your personal account page (click on My Account). Any PDFs will show up under My PDF Manuals. You will be allowed three downloads, so please save the file on your machine for backup.

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Ideally you should pressure test and set the correct release pressure when installing new tips. If there is a Bosch repair facility near by you can have them do this testing/adjusting for you. You can install these tips without checking adjustment and in many cases they will fall into an acceptable pressure/spray pattern range. This might be preferable to badly worn out fuel injectors - but best to test pressures and balance injectors if you can.

New tip design produces spray pattern with better atomization (fine mist)

ADDITIONAL ITEMS NEEDED: Anytime you remove and replace your injectors you must replace the heat shield washers under the tips. You will also more than likely need to replace the rubber fuel return hoses connected to the injectors. We offer the original style braided fuel return line as well as viton grade return line.

I recommend you have a torque wrench handy when rebuilding your injectors. If not we offer one at a great price. Look below to order. Use a torque wrench when cleaning or rebuilding injectors

HIGHLY RECOMMENDED: You will need some fine sandpaper to lap in your injector parts during rebuild. We have an kit available separately that will assure your injector halves don't leak when you put them back together.  Instructions and tips are included.  

Note: This kit can also be used to fix a pesky leak on your existing injectors. Look below to order. 

WARNING:

The health and longevity of your new Mercedessource injector nozzles with be directly affected by the cleanliness of your diesel fuel and its lubricity. Any gunk or crude in your filters or injection pump could travel to the new nozzles and cause scoring leading to premature failure (our warranty does not cover nozzle tip scoring). The following procedures are a MUST with installing new nozzles:

1. Diesel Purge

Run at least one can (two if you have never done it) of diesel purge through your fuel injection system before removing your old injectors.

2. Change Filters

Change both your pre and main fuel filter. Enter Fuel Filter in the search box to see all products.

3. Use Fuel Additive

The new ultra low-sulfur  (ULSD) diesel fuel available at the pumps is not kind to mechanical fuel injectors. The sulfur was the key ingredient used to keep your fuel pump and fuel injectors lubricated. To protect your new nozzles we recommend you add a high grade fuel additive to your fuel (such as Lubro-Moly Diesel Hi-Test)