Mercedes-benz w210 starter replacement (1996-03) e320, e420 pelican parts diy maintenance article gas in babies treatment

There are some projects that seem like they should be relatively routine–and are very easy to perform on other cars–but are a huge pain on The Mercedes W210 with the M104 engine. Replacing the starter is one of them. Most other cars I’ve worked on have had relatively accessible starters. If you are quick with the tools, you can have the starter replaced within 15 minutes on some engines. Not so with the W210.

This is one of those jobs where your patience will be stretched to the limit, as the bolts that hold the starter on are not only very hard to access but are also usually torqued to a very high amount, making it very difficult to remove them. One tip I would offer is to soak the heads of the bolts with penetrant spray for a few days prior to removing them. Good quality oils can seep into the threads and make removal a bit easier.

Begin by disconnecting the battery at the disconnect terminal located in front of the rear passenger seat. The starter has a constant 12V lead attached to the terminal. You can cause damage to both the car and also yourself if you accidentally touch this terminal with the battery disconnected.

Comments: Hello I have a 2000 e320 benz that will not start. I have working lights and power, but when I turn the key is get a "thud" noise almost like something seem to be stuck. Could the issue be the starter? The noise is kind of like "doom" then that’s it.

Comments: I have the same problem as Dan.. "The cable from the starter to the 12V lug on the chassis is corroded and snapped off of the lug. When attemting to turn the 17mm nut the whole post turns with it. What is the easiest way to fix this? I also noticed that I have lost power to the gauges since I turned the nut/post."

Comments: Thanks Nick – Are there any links or diagrams you can provide to better see the location of the starter upper bolt versus the bell housing bolt ’97 C280. Are the bolts identical, the one I removed from the upper location was identical to the lower starter bolt. Thank you.

Comments: I have a 1997 C280 W202 and am amidst a starter replacement. I removed the upper and lower 17mm bolts, along with the wires and other items, but for some reason can’t budge the starter free. Am I missing something? I hope there are only 2 17mm bolts. I tried prying it free without luck. Any suggestions, other than also trying a hammer to jar the starter loose from the bell housing? Please help.

Comments: I have a 1999 E430. The wire between starter and solenoid has totally corroded and disintegrated. I understand wire cannot be fixed and starter must be replaced. Bolts holding starter to motor are not the standard metric bolts. What size/type socket is required? Also can starter be removed before removing terminal wires? Does anything else have to be removed to make room for starter replacement? Thanks…..Len

Followup from the Pelican Staff: You will have to disconnect the battery, then remove the wiring. You can removed the wiring once the starter is unbolted, but it will be harder to free the fasteners. The fasteners are likely E-style External Torx. – Nick at Pelican Parts

Comments: I put in a new set of wires that went to the starter. Number part:129-540-21-30. I was told it was my cylnoid. I bought a new starter.the car still won’t start unless I use a screwdriver to start.the top of the unit has these numbers;0185450028. Could the lower part of the harness not be working? Where does the lower part of the harness go to.Do I need to repair this as suggested.?

Comments: I put in my starter wires and oil pump oil leave wire one cause it fride up on my SL320 1995 Mercedes so everyone told me I need a new start to so I put one if them in to the car start if I put a scerldriver on synioned and the 12 built cable and it will start so what can I do and were should I look for to fix it this the cable part I put in 129-540-21-30 and a new start in to this the part number it was on top of the piece 0185450028 do you think the other part of this line could be mess up to why it not getting any voltage one the Eire I don’t know what I need to for so it will start with out starting it with a scrudriver touch it so what scruldiver so what should I do to fix it can you help me thanks billy bear

Comments: The cable from the starter to the 12V lug on the chassis is corroded and snapped off of the lug. When attemting to turn the 17mm nut the whole post turns with it. What is the easiest way to fix this? I also noticed that I have lost power to the gauges since I turned the nut/post.

Followup from the Pelican Staff: The lug on the starter? You can try to counter-hold it with a pair of vise grips. if all else fails, break the stud out of the solenoid, then separate the two. be sure the battery is disconnected before beginning. – Nick at Pelican Parts