Engine Replacement - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 03-16-2008, 01:28 PM Thread Starter
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Engine Replacement

Hey Guys.

I am currently looking at a couple of 280SE (w108) 1971 models for restoration. My plan is to keep the cosmetics and exterior completely standard, but I am considering replacing the engine with a newer type as fuel in our country is becoming increasingly expensive, so I need some advice and guidelines. My plan was to fit a 2.8 Straight 6 with modern transmission (as used in the C280 or the W124 280E) to the car. This should give better consumption and emission levels. I got the idea from the “our SL” website. On there they have W113 280 Sls, completely rebuild and with modern engine, transmission and ABS brakes. Is there any one that has tried this or do you think it is a waste of time?
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post #2 of 10 (permalink) Old 03-16-2008, 01:40 PM Thread Starter
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Here is some pics
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post #3 of 10 (permalink) Old 03-18-2008, 01:06 PM Thread Starter
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No one prepared to help out??
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post #4 of 10 (permalink) Old 03-18-2008, 02:18 PM
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That's a V6 in the Pagoda ??? Wow..

Sorry, but I don't know how to start on such a big job..
-It's first the engine itself with engine mounts, and fitting Generator, PS, AC and so on... With complete electronic iginition, injection, throttlesensors, hooked up to the ABS, and/or ASR system etc...
-Then transmission, with mountings.. prop-shaft, brakes etc..
It's so much more than one thinks of at first..

1991 W140 400 SE - SOLD !!
1973 W115 200 -For sale as project.
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post #5 of 10 (permalink) Old 03-19-2008, 03:38 PM
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How do you guys attach the pictures? I tried everything it does not accept more than few bites.
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post #6 of 10 (permalink) Old 03-27-2008, 07:50 PM
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your first hurdle is getting the motor to run. For a more modern motor, that means lots of wiring pulled from the donor car. The other problems will be getting the thing to fit under the hood and having a working exhaust and driveshaft.

These can be overcome with dillegence. However, if your goal is to save a little money, this isn't the way to go, since you will spend a few hundred dollars on the exhaust, more on the drive shaft, and plenty more money (and time) on the wiring, not to mention the cost of getting the used motor.

If you want to go economical, get a diesel from the mid 80s or late 70s and work with its minimum wiring needs. You'll still have the problems of getting it in under the hood, but you can go "free" for the fuel with a bit more work. Heck, a friend has a 2.5 turbo diesel in his 230SL.

-CTH
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post #7 of 10 (permalink) Old 03-27-2008, 08:24 PM
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I have a straight 6 and it doesn't get to good of gas mileage, I get about 15-16MPG on 93 octane.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #8 of 10 (permalink) Old 03-28-2008, 07:15 PM
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Question

Quote:
Originally Posted by sklas View Post
Hey Guys.

I am currently looking at a couple of 280SE (w108) 1971 models for restoration. My plan is to keep the cosmetics and exterior completely standard, but I am considering replacing the engine with a newer type as fuel in our country is becoming increasingly expensive, so I need some advice and guidelines. My plan was to fit a 2.8 Straight 6 with modern transmission (as used in the C280 or the W124 280E) to the car. This should give better consumption and emission levels. I got the idea from the “our SL” website. On there they have W113 280 Sls, completely rebuild and with modern engine, transmission and ABS brakes. Is there any one that has tried this or do you think it is a waste of time?
I wonder what it would do to the mileage to stuff in a 560 SEC engine? If you are going to replace why not go with the latest most updated engine?

Last edited by q45denver; 03-28-2008 at 07:22 PM. Reason: addition
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post #9 of 10 (permalink) Old 05-14-2008, 06:21 PM
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I have a 1976 300D with a Ford 302 in it... runs good.... just ALOT OF WORK!!!! you have to have alot of tools to... a welder IS required.... but i love my car it is 1 or a kind.... i also have a 87 635csi with 245k on the clock that when(IF) it dies i'm gonna put the e36 M3 engine in it so i'll have 2 special cars.... Engine swaps are VERY hard.... and if you f with your brakes.... KNOW WHAT YOUR DOING! you need to stop and steer thats all you NEED... a nice down hill path can replace your motor.... till you have to go back..... then your screwed...

~Alpine

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(Making Page)
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post #10 of 10 (permalink) Old 05-14-2008, 08:40 PM
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Quote:
Originally Posted by sklas View Post
Hey Guys.

I am currently looking at a couple of 280SE (w108) 1971 models for restoration. My plan is to keep the cosmetics and exterior completely standard, but I am considering replacing the engine with a newer type as fuel in our country is becoming increasingly expensive, so I need some advice and guidelines. My plan was to fit a 2.8 Straight 6 with modern transmission (as used in the C280 or the W124 280E) to the car. This should give better consumption and emission levels. I got the idea from the “our SL” website. On there they have W113 280 Sls, completely rebuild and with modern engine, transmission and ABS brakes. Is there any one that has tried this or do you think it is a waste of time?
It's lot easier than these others realise. In fact all you need is a engine hoiust and some time. You need a donor car so a written off W124 is a good start.
Remove the old merc engine and trans. Keep the drive shaft and shift linkage .
overhaul the front end because after 37 years it wll be worn. keep the standard brakes and steering bercause if they are good enough for a 6.3 liter V8 they are good enough for your six.
Drop the engine into place . you will need to fabricate two new engine mount arms to locate the engine in the wider space.
the trans nmount should bolt up. the drive shaft is a similar design but it's possible to use the W124 friont shaft in the rear W108 shaft.
Get the original radiator overhualed and get the top and bottom hose connections modified to fit at the same time.
Undo the wiring harness from the W124 and note the connections for the starter ,alternator and so on. you casn wire the stock W108 into this loom and ECU.
These are the basics ,you will find a lot of design similarities between the two different models and you notice that most things interchange. Good luck!.
BTW,heres a link to a good read about dropping a 560 into a W123. Same basic process.
Retro Rides - 1984 Mercedes 230E 5.5 V8
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