Author Topic: 3.5 motor installation  (Read 2429 times)

opopotts

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3.5 motor installation
« on: April 04, 2021, 22:13:48 »
I have a 3.5 motor and was thinking about installing it my automatic 69 280SE coupe. What do I need to change engines?

m300cab

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Re: 3.5 motor installation
« Reply #1 on: June 04, 2021, 21:45:44 »
you will need a transmission as well
the 3.5 came w a 4 speed automatic, the 4.5 and 450sl have a 3 speed
Michael Parlato

Benz Dr.

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Re: 3.5 motor installation
« Reply #2 on: June 04, 2021, 22:51:53 »
All of the wiring harness, fuel pump, radiator, oil cooler, different front springs, driveshaft, and probably other things I can't think of.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

wwheeler

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Re: 3.5 motor installation
« Reply #3 on: June 04, 2021, 23:57:59 »
Don't forget about the exhaust and hangers. Possibly the trans mounting is different. And just think about all of the electronics for the new Bosch injection system. Yikes! I am sure there are people who have done this, but they probably had a real 3.5 to go by as an example. Is yours a low grille?
Wallace
Texas
'68 280SE W111 coupe
'60 220SE W128 coupe
'70 Plymouth Roadrunner 440+6

perry113

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Re: 3.5 motor installation
« Reply #4 on: June 06, 2021, 23:21:05 »
My 1970 280se coupe was a Mercedes rescue situation.
It was used as donor car for all of its 111 026 V8 parts and used on 1970 280se cabriolet low grille 6 by the previous owner.
I bought the remains of the car and all of the cabriolet 6 cylinder parts and put it back together as a 1970 low grille 6 coupe.
So everything from battery box location, wiring harness, rear end, driveshaft, engine, transmission, everything that is V8 specific you will need.
My car someday would be the perfect candidate to be converted back to a "real" 111 026 non matching numbers coupe.
You need a complete "very rusted" or crashed 3.5 coupe or convertible donor.
That is for the next owner, not me.
It is a great W111 low grille 6 with some intrinsic underlying value to making it into a real 3.5.
see pictures here.
https://goo.gl/photos/TuCgHGdfBoLQHAX26

https://goo.gl/photos/YmAejCBEGRCjM5Kh9

Also see rescue profile here Hemmings
https://www.hemmings.com/stories/article/swabian-swapping-1971-mercedes-benz-280-se

See cabriolet conversion car here:
https://www.hemmings.com/stories/article/three-pointed-perfection-1970-mercedes-benz-280


 
« Last Edit: June 07, 2021, 10:26:36 by perry113 »
Peter Perry
1970 911T Bahia Red
1972 911T Albert Blau
1963 220seb coupe barn
1965 230SL Light Ivory automatic
1966 230SL Havana Brown 4 speed Barn Find
1970 280SE living 3.5 donor car