How hard is it to change out glow plugs on a W124?

[jbach36]

Just the visuals, look to be to take off the fuel line and rubber fuel hoses, and then take the injectors out, put new ones in at the proper torque (how much is that, by the way?), and then hook the fuel lines and rubber fuel hoses back.

Is there more to it than what meets the eye?

W124 260k

[dieselbenz1]

Which engine?

[jsb357]

glow plugs or fuel injectors?

[jdulle]

If you are talking about the glow plugs you do not have to mess with the injectors or fuel lines. IIRC you just have to remove the intake manifold and then it is pretty straightforward.

[jbach36]

Originally Posted by dieselbenz1

Which engine?

602 engine.

[jbach36]

Originally Posted by jsb357

glow plugs or fuel injectors?

My mistake, I meant fuel injectors. I corrected my post.

[jdulle]

For the injectors, you may want to remove intake manifold, remove the lines going to them, keep everything clean, you may need a special socket, for my om606 I bought the special socket, but a deep socket of the right size might clear the nipples for the return lines (you don't want to damage them). Also there is a washer (heat shield) that sits between the injector and the head. Make sure it is in the right way. Some have said that the expensive german ones are better. Make sure you torque to proper lb ft. Reattach fuel lines. Check all of your lines to make sure the clips are holding them from rattling against eachother and the engine. I have not replaced all of the injectors before, but have removed one that was leaking compression.

[dieselbenz1]

You may find plastic inserts on each injector which would be broken and cracked by now. They were intended to quiet the engine somewhat but are na and not required.

[Diesel911]

You will need new heat shields for the injectors.

If they had not been changed for over a year you are best off using new injector fuel return lines. By the time you notice a leak you the fuel loss could have exceeded the cost of new hose/line.

Applying a never-seize type compound to the Injector threads can also be helpful.

[JHZR2]

Originally Posted by jdulle

For the injectors, you may want to remove intake manifold, remove the lines going to them, keep everything clean, you may need a special socket, for my om606 I bought the special socket, but a deep socket of the right size might clear the nipples for the return lines (you don't want to damage them). Also there is a washer (heat shield) that sits between the injector and the head. Make sure it is in the right way. Some have said that the expensive german ones are better. Make sure you torque to proper lb ft. Reattach fuel lines. Check all of your lines to make sure the clips are holding them from rattling against eachother and the engine. I have not replaced all of the injectors before, but have removed one that was leaking compression.

Only one cylinder needs removal of the intake crossover tube. The rest are readily accessible.

[jdulle]

Glad someone else chimed in here since I haven't done this on my om602 yet. Pretty easy to remove the crossover tube.

[JHZR2]

Originally Posted by jdulle

Glad someone else chimed in here since I haven't done this on my om602 yet. Pretty easy to remove the crossover tube.

Go easy on those Allen screws that hold the intake together. A ball end hex is helpful to make the angle, and clean the female hex very well and seat the tool fully!