hello

i have a 87 mod w126 300se. i now have got a hold on a 93 mod m104 300 complete engine, as i have read they both share the same block but thas just about it. i wondred if i could fit the m104 in my car with the ignition system thats allready in the car? or do i have to change the whole wiring system in my car before the engine eventually will start?

thanks for answeres and sorry for my bad english

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My car 87 Mercedes 260se
Dad's cars
99 Mercedes 290tdt
97 Mercedes 300sl
89 Mercedes 230 te
99 Mercedes sprinter 312
89 Mercedes 560sec (sold)
84 Mercedes 500sec (sold)
97 Mercedes 300sl (sold)
87 Mercedes 190e 2,3 16v (sold)
And about 400+ other merc's

It's not just about numbers. If it were you'd buy a VAG diesel
Audi is just the same as Aids

Everyone wants to know if it will "fit". Undoubtedly it will fit, but the question is whether you can get it to work, at a reasonable cost. A "93 104 300" could be a CIS engine (300SL), an LH engine (300SE) or an HFM engine (300E). You'd be in the best shape if it was a CIS engine but it would still be a big project that would require transferring many components from the donor car and considerable experimentation and trailblazing. If you are not capable of tackling it yourself I would get a shop to quote a fixed price for the project, which many shops would not do.

To go M103 to M104 it will fit fine, but you will need ALL wiring and computers and sensors from the other car.

Not a project I'd ever want to deal with. I like the M103 better anyways.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

The W124 chassis had both engines fitted. The W126 chassis had just the single cam fitted.

Given that the fuel and ignition systems have virtually nothing in common, you'd need both W124 cars side by side to make this project even remotely cost effective.

Since the W126 has none of this interchange available as a factory model, you're going into unexplored territory. I've made these one of a kind swaps before, and let me tell you, it ain't pretty.

This is something that needs the three T's: Time, Tools, and Talent.
If you don't have all three, don't even start this kind of project.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

You forgot one other ingredient...............$$$$$

I say go for it! Just strip everything from the donor car... mock it up off car then install away!!! Before I stripped everything from my submerged w140 I would never consider such a project... but now that i've disassembled the entire car... I can see that it's really not that complicated... A LOT of wires, yes... the key is tracing everything and that's EASY once the entire car is stripped. easier said than done?... maybe... but DOABLE. prep is key.

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project

Check out the forum 190 Revolution, the modification section. This swap has been done a lot with much information there.