Merc 4.5V8 into W111 220SE - Page 2 - Mercedes-Benz Forum

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post #11 of 19 (permalink) Old 09-27-2010, 06:36 AM
GGR
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Hi Drew,

I'm facing the same problem as you with the tunnel as I'm fitting a 5 speed manual lateral shift transmission in a '62 W111 Coupe. I found someone that can cut a tunnel out of a W108 4.5 and send it to me and I'm sending him the picture below for him to know where to cut. But I wonder why you included that section at the back of the crossmember? Can't I have him cut it flush at the back of the crossmember and weld it to the rear section in the car? This would save me the assle with the seat mounts?

Thanks in advance for your answer!
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post #12 of 19 (permalink) Old 09-27-2010, 03:14 PM Thread Starter
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Hi GGR,
You are right - it is not essential to take the piece of tunnel from the crossmember back. The reasons I did it this way were:
1) I wanted to mount the floor shift as per the factory position - this was incorporated into the crossmember pressing of the 108
2) My sedan had a driveshaft centre bearing further rearward than the W108. So I could have just modified the finnie tailshafts to use the original centre bearing location. But I chose to take the longer section of tunnel so it would have the W108 centre bearing location, so I could also use an unmodified W108 tailshaft. Interestingly, my 1967 250SE coupe has the centre bearing in the location of the W108, so I would not have to do it that way.
I also could have 'unpicked' the centre bearing sheetmetal carrier from the W108 tunnel and just plug welded it in where required.
There are many ways to skin a cat. Mercmad may have some pics of tunnels he has done - he only goes to the crossmember. Good luck.

Cheers, Drew
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post #13 of 19 (permalink) Old 09-27-2010, 04:52 PM
GGR
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Thanks Drew,

I'm lucky not to have to modify my driveshaft. One question: would you know if the shifter is at the same place on both cars, or is it more backwards on the 3.5?
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post #14 of 19 (permalink) Old 09-27-2010, 04:53 PM
GGR
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Ron, could you please post pictures of the way you're doing things? Do you keep the W111 cossmember or do you graft a 3.5 section?
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post #15 of 19 (permalink) Old 09-28-2010, 09:26 PM Thread Starter
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Hi again,
Quote:
would you know if the shifter is at the same place on both cars, or is it more backwards on the 3.5?
I am not sure what cars you refer to. But none of my finnies (sedans or 250coupe) have a floor shift so I can't answer.
I will email Ron and see if he can show some pics of his jobs. When I was over there last Saturday he was working on a 500 into a finnie sedan, and had just cut out the tunnel in front of the crossmember where the flex disc is. And he was modifying the tailshaft this week.
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post #16 of 19 (permalink) Old 09-28-2010, 09:37 PM
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SIIIIIIIIIICK!!!!! Nice job man...

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post #17 of 19 (permalink) Old 09-29-2010, 01:10 AM
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GGR, i have found that the W111 Finny tunnel is big enough for the V8 trans,which is smaller than the original DB automatic. So all i do is relieve the tunnel just in front of the seat brace .
But the 5 speed needs a bigger tunnel.

Iv'e put a couple of pics here of the latest swap.
Picasa Web Albums - briskiwi - Marcus' W111 ...

Coupe floors with six cylinder and floor shift manual look like this.


V8 coupe shifter is in the same place as W108 etc.

V8 manual trans ,5 speed,tunnel


manual trans tunnel in coupe ,note shifter hole.


Last edited by mercmad6.3; 09-29-2010 at 01:13 AM.
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post #18 of 19 (permalink) Old 09-29-2010, 04:49 AM
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Thanks Ron and Drew, this is so useful. My tunnel has already been modified by the previous owner to fit the 3 speed auto trans. He modified it a bit like Ron did but the shifter sits too low and too much in the center. As a result the linkage is too close to the driveshaft and barely makes it in between the flexdisc and the tunnel.

The 5 speed manual I'm fitting is not bigger than the three speed auto currently in place but there is not enough space for the three rods and the shifter to operate properly. I need to raise the shifter and move it a bit to the left and make more space for the rods the go round the flexdisc. I think I'm going to do a bit like Ron is doing and leave the crossmember alone.

Thanks again!
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post #19 of 19 (permalink) Old 09-29-2010, 08:48 AM
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Thanks for you advice. It is much appreciated.
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