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Old 04-01-2015, 09:06 AM
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Join Date: Jul 2014
Location: Cranbourne, Victoria, Australia
Posts: 36
722.3 into W201 190e 2.6


I know it is a bit of work, but does a 722.3 fit into a 190e 2.6?

The 722.4 is unlikely to handle the punishment I intend to unleash upon it...

I just need to know if anyone has done this conversion, I cannot seem to find any accurate info on this subject.

Thankyou in advance....
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Old 04-03-2015, 07:51 AM
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Join Date: Dec 2000
Location: Long Island, NY
Posts: 3,710
It's all about the bell housings, since they are part of the case. A 2.6 motor has the same rear bolt pattern as the bigger 2.8 & 3.0 motors and the smaller 2.2, 2.3, 2.4, 2.5 motors.

Once you have something that bolts up, you need to worry about the tail shaft. They are interchangeable, so when you discover your swap has a 10mm larger diameter than the original, just swap out that part and replace the seal and lock ring when you do. A special 30mm socket is required for that job.

Then there's the issue of the shift points, kick down and all that. The transmission is tuned to the engine. This is where you will have some "fun" and will discover that there is no reliable track record to go by. A competent automatic transmission guy will be your best resource.

Lastly, watch the driven plate on the back of the engine. It has metal bumps that are used to trigger the ignition. On your car, there are three of them. Each edge of the bump is an ignition control point. A 4 cylinder car will have two bumps (4 points). The diesels won't have any.

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Old 04-03-2015, 07:56 AM
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Join Date: Jul 2014
Location: Cranbourne, Victoria, Australia
Posts: 36
Yes, I had to modify the 3 trigger segments on the flywheel to get the Haltech to correctly interrpret the crank signal... not fun...

I am aware of the physical differences, which I can overcome, I just need to know if the transmission is physically TOO LARGE to fit in the transmission tunnel of a w201..

It has been suggested to me that the trans tunnel is too small. I do not believe this, but would like to know for sure before I toss in the 3.0 with 45PSI, or do I put that monster in a 300CE....

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Old 04-07-2015, 05:58 AM
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Join Date: Jan 2008
Location: Melbourne Australia
Posts: 831
I have installed a 722.3 into a W124 260e. It fitted O.K. however there were a few issues.
(a) Had to change the flex disk.
(b) had to change the wiring control for the cut out switch
(c) had to change the torque converter.
(d) The 722.3 is longer and the tail shaft need to be pushed back in.
(e) Had to change the transmission cooler lines

If you install a 3.0 engine in to the W201 I can't say for sure where or not the 722.3 transmission will fit with it. You may have an issue with the tail shaft as well as clearance on the transmission tunnel.
You may also have an issue with clearance with the transmission filler pipe.
There may also be an issue with the diff.

I have installed a 3.0L engine into a W201 2.6 and kept the 722.4. It's O.K. if you want to do "un-spirited"driving.

In your case this is not an option.
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Old 04-07-2015, 06:19 AM
Registered User
Join Date: Jul 2014
Location: Cranbourne, Victoria, Australia
Posts: 36
Thankyou for the reply,

Yeah, 260E is the same body/trans tunnel/floorpan as a 300e... Did you do the 3.0 engine as well?
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