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  #1  
Old 12-09-2005, 02:12 PM
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300 Turbo Diesel in 240D

Hello,

I am still in the process of working on the engine in my 77 240D, but if it is shot, I may have found a back up engine. The backup engine is in a 79 300 D, turbo. The 79 has a horrible interior and real bad body cancer that makes it quite an investment to restore. I was wondering what would be involved with putting that motor in my 240D with my 240d auto tranny? Would the drive shaft length need to me modified or engine mounts moved? Any engine bay clearance issues? Are there electrical connection concerns with the glow plugs, heater controls, or anything?

I will search more while getting responses to this post.

For the price I can get this whole other car, I can't even get my engine disassembled and inspected, so it may be worth it.

All info. and opinions are appreciated.

Glenn

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  #2  
Old 12-09-2005, 02:25 PM
Craig
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Are you sure it's a 79 300 D, turbo? 1982 is the first year for a turbo 300D. Prior to 82 they are 5 cylinder non-turbo engines.
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  #3  
Old 12-09-2005, 03:24 PM
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huh

Well, I didn't know that. I am just going off of what the ad said. The pics don't include a shot that would definately prove it one way or the other. Would the concerns be that much different putting a turbo or non turbo OM617 engine in a 240D?

Thanks,
Glenn
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  #4  
Old 12-09-2005, 03:42 PM
TheDon's Avatar
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wouldnt be .. as slow as a regular 240D i bet
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  #5  
Old 12-09-2005, 03:48 PM
Craig
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The short answer is that it is possible to put either a 617 non-turbo or turbo in a 240D. The 240D chassis (W123) is the same as the 300D. There are some people on this forum who have done this.
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  #6  
Old 12-09-2005, 06:04 PM
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Quote:
Originally Posted by glenn1179
Hello,

I am still in the process of working on the engine in my 77 240D, but if it is shot, I may have found a back up engine. The backup engine is in a 79 300 D, turbo. The 79 has a horrible interior and real bad body cancer that makes it quite an investment to restore. I was wondering what would be involved with putting that motor in my 240D with my 240d auto tranny? Would the drive shaft length need to me modified or engine mounts moved? Any engine bay clearance issues? Are there electrical connection concerns with the glow plugs, heater controls, or anything?

I will search more while getting responses to this post.

For the price I can get this whole other car, I can't even get my engine disassembled and inspected, so it may be worth it.

All info. and opinions are appreciated.

Glenn
Its probably a '79 300SD that has the turbo in it, o/w it could have been converted to use a turbo but all original 300D in '79 cans NA (sans turbo)
You need to change the exhaust line, if you had an SD it will not be useful for any exhaust components. And the trans in your 240 probably isn't up to the turbo standards so figure on swapping the whole drive train from a turbo car to your car. Lots of work. Its easier to find a good 300D turbo already and trade or sell the 240D.
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  #7  
Old 12-09-2005, 07:09 PM
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what fun would that be?

Sure, I could just sell my 240D and get another car that had a good engine, but what fun would that be? I am glad to hear that it is possible. I will do some more research and see if it is really feasible for me.

Thanks,
Glenn
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  #8  
Old 12-09-2005, 10:06 PM
t walgamuth's Avatar
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the hot setup

is the turbo 5 with the 240 stick. be sure to change the rear end too and speedo and driveshaft and radiator. the second engine shock bracket must be fabricated, and there will be a redundant motor mount on the crossmember to be removed.

the 240 with 30o motor is a great car. i did one ( mine was non turbo). the simple ac controls are much much much more user friendly and never fail. unlike the stupid automatic systems which are a pain to keep working.

my $.02

tom w
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #9  
Old 12-10-2005, 03:13 PM
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wish I had a stick

I wish I had a stick, but I don't. Oh well. Is a 240D tranny really that wimpy? I mean would Mercedes actually spend the time to design a tranny to only take 70 horse? I guess I am stuck on Chevy mode where everything got a turbo 350 tranny.

The seller hasn't gotten back to me after I asked if it really was a 79 300d turbo. Hope I didn't upset him.

Is the 300D radiator larger? Is that why it is suggested to change over?

Is the only advantage to swapping the rear end the different gear ratio? Would the 240D rear end just make the car more peppy and have a lower top speed and worse fuel mileage or is there an incompatibility?

Thanks,
Glenn
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  #10  
Old 12-10-2005, 11:36 PM
t walgamuth's Avatar
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i agree

the 240 auto is prob the same as the 300.

the need to change the gear ratio is because with more power you can pull a taller gear ratio which allows the engine to turn slower at hiway speeds and thus is quieter, uses less fuel and lasts longer. the 240 rear end will work fine but you will have a tire burning drag specialist that gets lousy fuel economy.

kindof defeats the reason to have a diesel engine. imho.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #11  
Old 12-11-2005, 03:17 PM
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Quote:
wish I had a stick, but I don't. Oh well. Is a 240D tranny really that wimpy? I mean would Mercedes actually spend the time to design a tranny to only take 70 horse? I guess I am stuck on Chevy mode where everything got a turbo 350 tranny
I think the consensus on this board is that the 240D stick shift is beefy enough for any engine that MB put in the W123's of the day (that includes the 2.8l ga$$er 6cyl in the 280E's). I've never done it myself, but I've never heard of anyone (here) that has swapped a 5cyl (turbo or non) in front of the stick shift and broken it.

-John
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  #12  
Old 12-11-2005, 03:55 PM
t walgamuth's Avatar
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i could be wrong

but i took him to mean the automatic tranny.

i agree the stick tranny is plenty beefy from all appearances. i am pretty sure they used the same trannys in the sl s with v8s.

tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #13  
Old 12-11-2005, 05:11 PM
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R leo has a stick shift 300DT with a stick he has towed another 300D with....if that won't break it nothing will.
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  #14  
Old 12-11-2005, 05:34 PM
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Glenn

The 240D, 300D, 300CD, 300TD, and 300SD ('78-'80) all used the W4A 025 auto transmission

The turbo models used the W4A 040 auto tranny
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  #15  
Old 12-11-2005, 05:57 PM
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wonderful

Thanks for all the excellent information. Is there a transmission crossmember that would also have to be moved during the swap?

Thanks,
Glenn

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