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500 SE Donor Car

Started by robertd, 15 June 2012, 09:27 PM

robertd

#15
I am thinking of dropping the 5Ltr M117 motor into this very tidy 123 sedan that I have parked in the shed? What do you think?
take this one out
put this one in
I spoke to John Green from MB Spares today re this project and he tells me that they have done a couple of 5Ltr transplants into 123 sedans.
Apparently the 123 engine bay is wider than the 126 so that engine mount spacers are required to accomodate the V8?
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

Tony66_au

Hell id do it!

A W123 5.0 will turn a few heads and should be a heap of fun.

nathan

there are some youtube vids of crazy people who have done this.  however, if the 123 if nice and genuine, id be tempted to leave as is and find another one thats not so healthy!
1979 116 6.9 #6436
2018 213 e63
2011 212 e63
2011 463 g55
2007 211 e500 wagen
1995 124 e320 cabriolet
1983 460 300gd
1981 123 280te

robertd

This project starts tomorrow ( Sunday morning ). and yes Nathan the blue 123 is too good to sacrifice ( I'm still a purest at heart ). so I am going to use another 123 sedan as a mule, its one the I bought 2 years ago as a parts car. It is in drivable condition with some non essential bits removed.
I will be able to experiment as I go, and no big deal if I make a hash of it.
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

robertd

Before starting the project I want to test the V8 for compression, I've been told it is a 9:1 c/r motor so what should it test at in "psi" ?
any input would be appreciated.
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

Big_Richard

#20
.

Kjhall65

One of John Green's mechanics is doing the same conversion into his W123.  Last time I spoke to him he only had the wiring harness to go.  Lots of first hand advice there if need be as you go through your conversion I would say.

robertd

#22
The result of the compression test showed the motor to be in good condition.
After a 5 minute warm up, tested as per the manual, allow 8 rotations with the starter motor
The variation was between 160 and 170psi as follows
right bank 160,165,170,165
left bank   170,170,160,165

now to get on with the removal
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

robertd

#23
Up she goes,

Exhaust came off in one piece without any bother

she is a big mother

all in one peice

ready for the next step, might be a few days before I can get to it
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

TJ 450

Very nice results. 8)

I still need to do a compression test on the ECE 560.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

robertd

hey Tim, it will be interesting to compare the compression with your 560, was it a local car or import?
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet

TJ 450

The 560 is a 10:1 UK import, so it would be a good comparison.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Tony66_au

Nice work!

Just as a matter of interest is that a Radum hoist?

I have been looking at their 3.2 ton unit for the shed.

Big_Richard

#28
.

robertd

good one Dave,
The comp test was done late saturday afternoon, (after work)
Sunday morning I had to maneuver the heavy 126 with no steering column into the shed,
it took the range rover, a 10m chain, a floor jack and a 2 wheel trolley and a lot of pushing and cursing to get it in.
actual time from car going on hoist to engine out was about 4 hours.
:)
116   1978 450SEL 6.9 #  4848
116   1979 450SEL  6.9 # 5884
116   1979 450SEL  6.9 # 6225  SOLD
116   1978 450SEL  6.9 # 5128  SOLD
116   1979 450SEL  6.9 # 5884  SOLD
116   1974 450SEL  DJet