sagesingh
Active Member
- Joined
- Jun 12, 2007
- Messages
- 111
- Car
- '95 W124 E220, '96 W124 E320 Cabriolet
I have the e220 cabrio but it lacks powers so i changing it to a m104 320. i have considered several other options but i think this would be the best.
I consider myself an experienced DIY mechanic, but without a doubt i have lots to learn still, i am carrying out all the labour myself to keep costs down.
I recently purchased a e320 coupe (£700) to use as a donor car and over the past few weeks have stripped both cars down. The following part have been/are being changed:
For ease i didnt remove any of the engine accesories, e.g. altenator, a/c comprossor etc... this saved a lot of time and all i have to do is connect up the pipe work afterwards instead of bolting everything back up to the engine.
there are 2 main differences in the body harness wiring,
There is also a difference in the centre propshaft bracket so that needs changing over also.
Regarding the suspension, i have the bilstein b12 kit that was orignally designed for the 300ce, so that is staying the same.
there is a second wiring loom coming out of the ecu, and there are three differences in the 220 and 320 wiring, I have a copy of the ecu pinout and pins, 9, 22 and 23 are different, the rest of the wiring is the same.
Pin 9 is the transmission overload protection switch, 320 has it 220 doesnt.
Pin 22 is different on both cars, for the m111 it is the cruise control on/off but on the 320 it is the clutch pedal switch. (i 99% sure i am asking a stupid question now, but are clutch pedal switchs only on manuals?) Another question i have is: i do not have cruise control so why is this pin there and not blank in my harness?
Pin 23 is CO potentiometer, i have it on the 220 but not the 320.
Instead of changing the looms over i plan to modify the harness i already have in the 220, i will use this my creating a 'converter box' which i will make from the 220 ecu female socket and the 320 male plug from the donor car. All the wires will be the same apart from these 3, i will block out pins 22, and 23 and wring in pin 9. This will make it look more original, or alteratively, i could just open the 320 ecu and solder onto pin 9 the wire and remove pins 22 and 23, i have not decided yet.
All in the wiring was actually alot easier than i had first anticipated.
The hard bits:
I know i have only really done the easy bits of removing things and the hard bit of putting things back in are still to go, but in all honesty i dont think the work has been hard, just labour intensive. The hardest bit was removing the 320 out of the bay, which i couldn't actually do, so i just ended up cutting the cross member on the coupe, but i cant do this on the cabrio.
so does anybody have any tips on how to get the engine into the bay???
Another question i have is do i need to change the rear dif?? the couplings are the same and the propshaft can just bolt up but are the ratios different?
i will post up pics of the car soon, at the moment i have a few on photobucket.
Merc Carbio pictures by CarPCCustoms - Photobucket
Also change a few broken vacuum pipes, which explained the aggressive gear changes.
On a side note, i have a jenhert install, wald body kit, (did have a custom exhaust, but wont fit on m104 engine so i putting it my brothers e220 coupe) among lots of other little things.
I consider myself an experienced DIY mechanic, but without a doubt i have lots to learn still, i am carrying out all the labour myself to keep costs down.
I recently purchased a e320 coupe (£700) to use as a donor car and over the past few weeks have stripped both cars down. The following part have been/are being changed:
- engine
- gearbox
- propshaft
- front brake calipers (pads+disks also)
- exhaust
- Radiator
- intercooler
- the 320 also has a oil cooler pipe that runs across the rad
- all the air ducting and water pipes
- ecu
- engine wiring harness --- i only removed the wiring connected to the chassis, the rest remained on the engine.
- gearbox wiring ---- this connects just above the passenger foot well, just as simple and unpluging and plugging in the new one.
- brake pad sensors wiring --- open the connector in the engine bay and slide the old wires out through the gromet, then thread in the new wires and put the connector back on and plug it in.
- maybe the left head light, or just the covering behind it as the air intake has something to do with that. didnt really look at it properly.
For ease i didnt remove any of the engine accesories, e.g. altenator, a/c comprossor etc... this saved a lot of time and all i have to do is connect up the pipe work afterwards instead of bolting everything back up to the engine.
there are 2 main differences in the body harness wiring,
- on the m111 the lambda sensor is on the exhaust manifold, whereas on m104 its on the exhaust, to do this i cut the wires from the e320 and threaded through the fuse box into the driver side under the carpet and then had to drill a hole into the body of the e220 (where MB has done on the e320 already). I then cut the connector block off the spare sensor and used this to attach the wiring to the original connector block of the e220 making it look original.
- on the m111 on sensor, not sure what it is is conected to the left of the engine block whereas on the e320 its on the right. I transferred this wire over too. It is hard to explain how i did it so i will take pics this weekend to show you how i maintained factory look. (in short i cut open the e320 wiring loom and transferred this one wire and placed it into the connector block where the old one was).
There is also a difference in the centre propshaft bracket so that needs changing over also.
Regarding the suspension, i have the bilstein b12 kit that was orignally designed for the 300ce, so that is staying the same.
there is a second wiring loom coming out of the ecu, and there are three differences in the 220 and 320 wiring, I have a copy of the ecu pinout and pins, 9, 22 and 23 are different, the rest of the wiring is the same.
Pin 9 is the transmission overload protection switch, 320 has it 220 doesnt.
Pin 22 is different on both cars, for the m111 it is the cruise control on/off but on the 320 it is the clutch pedal switch. (i 99% sure i am asking a stupid question now, but are clutch pedal switchs only on manuals?) Another question i have is: i do not have cruise control so why is this pin there and not blank in my harness?
Pin 23 is CO potentiometer, i have it on the 220 but not the 320.
Instead of changing the looms over i plan to modify the harness i already have in the 220, i will use this my creating a 'converter box' which i will make from the 220 ecu female socket and the 320 male plug from the donor car. All the wires will be the same apart from these 3, i will block out pins 22, and 23 and wring in pin 9. This will make it look more original, or alteratively, i could just open the 320 ecu and solder onto pin 9 the wire and remove pins 22 and 23, i have not decided yet.
All in the wiring was actually alot easier than i had first anticipated.
The hard bits:
I know i have only really done the easy bits of removing things and the hard bit of putting things back in are still to go, but in all honesty i dont think the work has been hard, just labour intensive. The hardest bit was removing the 320 out of the bay, which i couldn't actually do, so i just ended up cutting the cross member on the coupe, but i cant do this on the cabrio.
so does anybody have any tips on how to get the engine into the bay???
Another question i have is do i need to change the rear dif?? the couplings are the same and the propshaft can just bolt up but are the ratios different?
i will post up pics of the car soon, at the moment i have a few on photobucket.
Merc Carbio pictures by CarPCCustoms - Photobucket
Also change a few broken vacuum pipes, which explained the aggressive gear changes.
On a side note, i have a jenhert install, wald body kit, (did have a custom exhaust, but wont fit on m104 engine so i putting it my brothers e220 coupe) among lots of other little things.
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