Found a 75 240d manual needs motor - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 06-14-2011, 06:36 PM Thread Starter
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Found a 75 240d manual needs motor

I have scoped out a 75 240d manual tranny, locked up motor, for $500. Car looks clean, po says everything works but the engine.

Will my 82 300sd parts car motor fit in rather easily (no crazy modification) and mate up to the manual tranny? I have the complete car to swap parts from.

Does any one know of anything special that might need to be done in order to make that happen?

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post #2 of 10 (permalink) Old 06-14-2011, 11:59 PM
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The oil filter housing has to be moved. The turbo probably doesn't fit. The flywheel of the 82 300SD has to be changed (and the balance has to be transferred from the old flywheel). Some wiring has to be changed, gas linkage is different.
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post #3 of 10 (permalink) Old 06-15-2011, 06:12 AM Thread Starter
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That seems pretty strait forward. Is it possible to trim the inner wheel well to make the turbo fit? Must it be removed?

I'm going to inspect this car in a couple of hours, this project may be underway soon. I'll post some pics if I get it.
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post #4 of 10 (permalink) Old 06-15-2011, 06:28 AM
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It is not the inner wheel well, but the steering. The W115 has a different front steering system, resulting in less engine space. Perhaps the turbo can be moved or a different turbo can be fitted.

There is another thing: you have to change the rear differential. The 240D has a 3.69 ratio, you want to go to 3.46 (if you don't manage to install the turbo) or 3.07 or 2.88 if you do manage to install the turbo.

Remember: the devil is in the detail.
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post #5 of 10 (permalink) Old 06-15-2011, 09:49 AM Thread Starter
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paid $300

Oh crap, this car had an in tank wvo kit, I'm going to have to clean out the fuel tank and lines before new motor goes in.

What do you think. yes, good deal or no, you got taken.
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post #6 of 10 (permalink) Old 06-15-2011, 03:11 PM
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If it is rust-free (or mostly rust-free) it is not bad.

Did the WVO kill the engine?
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post #7 of 10 (permalink) Old 06-15-2011, 05:26 PM Thread Starter
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I think it may have contributed to it's death. I've heard single tank systems are no good because it gives the wvo no chance to warm up upon startup. Looks pretty rust free. Floors look solid (did not pull up all the carpets). The interior is in good shape other than the carpets. I am worried because po says windshield has a small leak. no cracks in dash or any seats. Best part is the new alpine head unit w/ iphone jack, nice sony amp and two nice alpine 10" subs in trunk. I need those for my w123 right now.

Battery is still up, Starter tries, seems locked. 70227 do you think I can swap the ring and pinion from the donor w126? (sounds like a pain in the ass)
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post #8 of 10 (permalink) Old 06-16-2011, 04:23 PM
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You mean change the innards of the rear differential? You need some special tools, but it is possible I suppose. It is probably easier to change the differential though, you'll have to take it off anyway if you want to change the gears inside.
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post #9 of 10 (permalink) Old 07-27-2011, 04:53 PM Thread Starter
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new direction

Well, the motor and tranny are out of the sd, but I may have found them another home. I came across a 1948 dodge sedan I had to buy, may need a motor/tranny. So we have suspended work until we figure out who gets the om617 and who has to wait. Check out my new bucket! Pics of how I found it.
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post #10 of 10 (permalink) Old 07-27-2011, 08:48 PM
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Personally I'd look for a new or used 240 engine. A rebuilt one will cost $4k (8 x the price of the car - I know) but it will fit and work and no differential changes or turbo to fit in...

All the work you're contemplating in the above posts might run you even more than 4k. Or sell your 300 engine and buy a Used 240 engine for the same price.

Good luck whichever road you choose.

Frank

Frank Flynn. Poet, Artist & Mystic
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