Does an W123 300SD 722.118 transmission fit on my W116 450SE ?

geiz · 03 August 2009, 07:29 AM

Fot $ale?

Than I have an backup if the removal fails ;-)

TJ 450 · 03 August 2009, 08:00 PM

Yes, it's here if you need it.

Tim

geiz · 04 August 2009, 03:20 PM

Professional equipment

The differences

TJ 450 · 04 August 2009, 09:31 PM

Professional equipment indeed.

I notice that the one on the right is much longer, it must be a special version for the diesels. It might be an idea to measure the length of the front shafts on the transmissions and compare them, just in case one is longer.

I'm led to believe that the vacuum modulator on these 722.118 transmissions controls shift points as well as pressure... I don't quite know how that works, but I just read that a few minutes ago.

http://www.mercedesdismantlers.com//722.118_transmission_adjustments.html

Don't quote me on this, but it may work just hooked up to the vacuum system on the petrol engines. Further investigation is required, however.

Tim

geiz · 05 August 2009, 03:50 AM

I needed an big 5kg hammer to smash it out, it works, without damages. (first heated the whole thing up to +/- 150 degrees, then cooled down the shaft in cool water)

Yes, the shaft is much longer. The bearing (for the axle between the torque converter and the 1st gear wheel set) in the 722.004 was pressed inside a hole at the rear of the bell house. The bearing in the 722.118 was pressed around the backside of the statorshaft (that's why he is longer) in a inverted way.

The diameter of the 722.004 stator shaft is 37.3mm. The diameter of the 722.118 shaft is 40.3mm.

I can do 2 things now; make the hole in the 722.004 bellhouse 40mm and cut the "bearing place holder" at the back off, pull in the 722.118 shaft and use the 4-spd gearbox as a set. Or I use a (your) "new" stator shaft and press it in the 722.004 gearbox and re-use the 3-spd gearbox.

1st option: more fun, more risk
2nd option: less fun, less risk

:-D

TJ 450 · 05 August 2009, 03:54 AM

That's pretty well it. There's a few options there, anyway.

Tim

Big_Richard · 05 August 2009, 03:57 AM

more fun, more fun, more fun!

we need a 4 speed auto w116 v8 to celebrate

geiz · 12 August 2009, 04:29 PM

And the choice is... more fun!!! :-D

I have enlarged the hole in the W116 bellhouse to 40.0mm and put in the shaft of the 4-gear box!
I've put the bellhouse again on the BBQ and placed the shaft in the fridge before I put them together

See the pictures:

Removed the bearing place holder & enlarged the shaft-hole

Stator shaft pressed into bellhouse!

Backside of bellhouse

Big_Richard · 12 August 2009, 04:40 PM

I'm a great fan of the resourcefulness of people on this forum to do what ever it takes to do a job, weather it be traditional or not. I'm very amused by the barbecue method and think its a fantastic idea at the same time

Big_Richard · 12 August 2009, 04:53 PM

something dosent look right there, why is that shaft sticking so far out on the backside last shot ? or is something missing

geiz · 12 August 2009, 05:51 PM

No, it is exactly how it must be on a 722.118 transmission

The bearing must be placed is around the backside of the stator shaft, instead of inside a hole at the back of the bellhouse.
Next time I'll make more pictures for you, so you can see why I have to do it.

Big_Richard · 12 August 2009, 06:08 PM

Quote from: geiz on 12 August 2009, 05:51 PM
No, it is exactly how it must be on a 722.118 transmission The bearing must be placed is around the backside of the stator shaft, instead of inside a hole at the back of the bellhouse.
Next time I'll make more pictures for you, so you can see why I have to do it.

excellent.

I really look forward to hearing how well the 4.5 litre flys with that new first gear

I suspect the rubber flex disks on the tail shaft will need to be replaced twice as often due to them ripping in half from all the torque

PS, if you find that the 4 speed dosent let the engine rev out as much before changing gears its going to be that the governor is setup for the low revving diesel engine. But i wouldnt swap that over just yet incase it causes other incompatibilities.

TJ 450 · 12 August 2009, 10:14 PM

How that bearing would work is beyond me... there would have to be a tubular extension on the input shaft of the gear assembly, as the stator shaft obviously remains stationary.

A picture of the input shaft of the gear assembly would be most interesting to see... perhaps it is more durable than the versions for petrol engines? I will need to rebuild the transmission in my 450 at some point... if I can beef it up, I'll do it.

Either way, that's brilliant work! It looks as good as new.

Tim

pompy · 12 August 2009, 10:17 PM

Well done Geiz,

Can't wait for the final result.

geiz · 13 August 2009, 04:03 PM

Thank you.

I can't wait either

But my 3th and 4th hands are on holiday and when he comes back I will leave this cold & rainy country for 2 weeks of sun ... I have to wait for at least 4 weeks to test this setup!

I'm not very scared for the earlyer shifting gearbox. The diesel engine can make 5100rpm and the M117 engine have it's maximum power @ 5000rpm. Maybe it's a bit slower than when you can shift later (use the full 5850rpm), but I would be very happy when I can finally drive this car!

The promised pictures (taken with my mobile phone, not very clear):