DO NOT ORDER UNTIL YOU REMOVE ONE INJECTOR IN YOUR ENGINE AND INSPECT THE HOLE. Sometime in 1974, Mercedes changed the way these injectors were sealed into the head to prevent air leaks. A "YELLOWISH" nylon sleeve was added along with two seals on the lower end of the fuel injector. The only way to know for sure if your engine has this change is to remove an injector and look. Once the fuel injector is out of the head, you can clearly see the nylon insert, as shown in the first picture below. In the earlier engines, you will only see a hole.
Product Details
The fuel injector and the top "pressure" seal ARE THE SAME for all 4.5 D-jetronic engines. But, in these later engines, the lower part of the fuel injector was hosed inside this nylon sleeve with two seals.
One is at the top of the sleeve, and the color is green. One is at the bottom of the seal, and the color is black. You can see how these seals deteriorate with age and heat.
If you find you have these types of injector seals, WHAT CAN YOU DO?
1. The nylon sleeves are no longer available anywhere. If you can find some NOS, you will pay dearly for them. If you can not remove them easily, it is best to leave them in place. You do not want to break them. If you can get them out and cleaned, you might try using a very high-temperature silicone sealant to help seal around the outside surface of the sleeve.
2. The green and black seals are still available as of April 2024. We will sell these separately as long as we can get them. See the related products below for availability.
Related Products:
Late 4.5 D-Jetronic Fuel Injector Special Seal Set
If you plan to replace, test, or service your electronic fuel injectors you first must determine which bottom seals you will need. If you have a 1970 or 1973 model, you most likely have the single-bottom seal (unless your engine has been changed).
1970 to 1975 3.5 4.5 D-Jetronic Fuel Injection Pressure Tester w/Extras
6/6/23 Update: Now with a liquid filled pressure gauge installed to increase accuracy and reliability. We customize, test and recalibrate this fuel pressure tester before we ship it.
1970 to 1975 D-Jetronic V8 Engine compartment Fuel Hose Replacement Kit
These engine supply fuel hoses are critical to the well-being of your engine. I have seen too many rotten and deteriorating hoses on these D-Jet engines that could easily lead to an engine fire, and they just do not get replaced when they should.
1970 to 1975 D-Jetronic Fuel Injector Hold Down Bolts and Washers.
Set of 8 correct size bolts and washers to spruce up the engine compartment of your D-jetronic V8 engine. Watch the videos to see how these actually look installed.
1970 to 1975 D-Jetronic Fuel Injector New Wiring Plugs x 8
These WILL NOT work on your original injectors. They will ONLY work on our new replacements (see below) These plugs are a good alternatiive to the damaged originals on your D-Jetronic fuel injected engine IF you are installing our new injectors.
1970 to 1975 D-Jetronic Fuel Pressure Regulators: How They Work / How to Test - On Demand Video
People call these two units pressure regulators, but really only one of them is. In this xx minute video, Kent will explain how these are different, what each one does, how to adjust them, and how to test them with a hand pump vacuum tester.
1972 to 1973 4.5 450 D-Jetronic New Replacement Fuel Injector Set with Extras
WARNING: MAKE CERTAIN your current injectors are blue/green at the top. A restocking fee will apply if you place an order in error. These are for the 4.5 engine only. See related products below for the 3.5. A video is worth a few thousand words.