Help Pulling M104 from W202 need tips - PeachParts Mercedes-Benz Forum

Jim_P · #1 02-28-2011, 03:22 PM

As the title states I am pulling the engine from my 95 C280 due to a burned out piston. Has anyone else done this and if so do you have any tips on what to take off and what can be left on the engine? Did you pull the trans and engine together? did you leave the engine harness connected?
Thanks in adavance,

-Jim

Jim_P · #2 03-01-2011, 10:35 AM

Does anyone have the service manual for this car? What does it recommend?
Thanks,
-Jim

junqueyardjim · #3 03-01-2011, 12:18 PM

Well Jim, as close as I can get is that I pulled the engine, (M103) out of my 86 W124. I pulled engine and transmission as a unit. Take your time and disconnect every connector that goes to any part that you are removing. Take pictures and identify everything. Like any big job, you have to work it out and have a plan in your head at least. Do you have the big tools, engine lift, floor jacks, wheel ramps ect. Remove as much of the fluids as you can before you start. Motor oil, coolant, PS fluid, trans fluid. Does your hood open up 100% like the W123/4 does. If it doesn't you probably should remove the hood. Next get the car up and off the ground and seperate drive line at the front flexjoint, loosen motor mount studs, transmission from whatever it is attached to, remove trans cooler lines and shift linkage and electrical connectors. Remove them carefully, don't break connectors. Look it over carefully and loosen everything that the engine and trans are connected to while you are under the car. Everything has to be disconnected! If it isn't, it won't come out. Then continue to the top. We assume that you will replace with an identical, "COMPLETE" engine. Again remove (carefully) every connector that is connected to the engine and to some place other then the engine, that is firewall or fender. It has to be dis-connected, and it you want it to run when finished, they will have to be re united. And that is the way you have to go around the entire assembly you wish to remove. If it is attached somehow to another part of the car, It must be dis assembled. The AC compressor is usually handled on a seperate basis. Can it be removed from the engine and allowed to remain attached say hanging by a piece of wire without having to loose the freon. Usually that is possible. If that does not look possible, and you must consider the condensor also, you should have it pumped out by an AC service station. It is illegal to dump it in the air. Heater hoses must be removed either from the firewall connections or the engine connection or both. Probably would be a good time to replace all heater hoses. If the exhaust is in good shape, I would dis-connect it as close to the engine as possible, (right off the manifol) and leave it hanging. If it seems that it is going to be in the way, remove it complete. So, if the job is new to you, remember it can be done. Go around the whole job with pencil and a notebook and make notes on what all you see and know that must be dis-assembled. Then determine what order you are going to do that. Remember, WORK SAFE! If it doesn't look safe, MAKE IT SAFE! I have pulled a couple of engine on W123/124. I have found that it is easier to pull engine and transmission together. I also find that to have the front up on wheel ramps and a good floor jack under the differential to lift a little when needed. And you really need a good helper. To your last question, the answer is no. You cannot leave it connected to anything off the engine. Now if you are replacing your engine with a used engine, and that engine is bare of any wiring, then all missing wiring and sensors from your old engine would have to be re attached. By the way is your engine gas or diesel. You should make that a part of your signature.

porkface · #4 03-02-2011, 01:56 PM

i hope you have a new harness, because you will need 1 after this job. the original harnesses do not like being moved at all. check the smaller 1's that go to the ac, starter etc., also. good luck, chuck