Need ideas for throttle wire OM617 to OM606 - PeachParts Mercedes-Benz Forum

superapan · #1 04-17-2017, 06:34 AM

Hi everyone!

I'm replacing the old OM617 to a newer OM606. All has gone well, but I'm sort of stuck when it comes to finding a smart and reliable way to convert the throttle rod linkage from the OM617, to the wire on the OM606. The pivoting pedal from the OM606 won't fit inside the footwell.

Has anyone else conducted a similar project? If so, how and what did you do?

Thanks in advance!

jay_bob · #2 04-17-2017, 07:55 AM

Are you using the OM606.962 (turbo) or .912 (non turbo) out of a W210? Or a .910 (non turbo) from a W124?

The versions from a W210 use a drive by wire system. The W124 used a legacy style injection pump with a mechanical cable control.

Most people who do this modification (putting an OM606 into an older body) get a pump from a W124-based 606 for control reasons. The control system can stay mechanical instead of trying to integrate the electronics into an old car. However if you are also swapping over the 722.6 transmission it will be bettter to bring over all the electronics.

If you have a turbo engine, the elements can be updated to turbo rates by Goran Lundgren (Dieselmeken). You are lucky, you're local to him in Sweden.

If you are using the full electronic package, the 606 in the W210 uses a pedal that pulls a Bowden cable that rotates a potentiometer in the engine bay. The older 123s have a crank rod that protrudes through the firewall. It should be relatively simple to adapt the rotary pedal sensor to the existing 123 style pedal.

I would see if a 124 pedal would fit better in the vehicle foot well. These attached to a cable in the engine compartment that pulled on the rack lever at the injection pump. This could be adapted either to a mechanical pump or the sensor used on the W210s since it is a Bowden cable arrangement.

superapan · #3 04-18-2017, 09:06 AM

Hi everyone, thanks for showing interest in my problem!

Quote:

Originally Posted by jay_bob

Are you using the OM606.962 (turbo) or .912 (non turbo) out of a W210? Or a .910 (non turbo) from a W124?

The versions from a W210 use a drive by wire system. The
I would see if a 124 pedal would fit better in the vehicle foot well. These attached to a cable in the engine compartment that pulled on the rack lever at the injection pump. This could be adapted either to a mechanical pump or the sensor used on the W210s since it is a Bowden cable arrangement.

Sorry I was a bit unclear as to what I'm working with. It's the NA OM606.910 from a W124 donor. It is impossible for the swivel-pivoting pedal from the W124 to fit in the W460 footwell. The range of motion is hindered.

Quote:

Originally Posted by Stretch

I'd stick with the rod system that's inherent to the older style. Work out the maximum travel needed at the pedal and at the throttle linkage - make up a bell crank to apply the correct travel. (I'm not quite sure where you'd mount it - post up some engine bay pictures if you need ideas)

The rod system is also a bit complicated. I'll try to explain the best I can. In the W460 and you push the throttle, there's a sort of a lever mechanism that inverts the motion. In essence, I need a pull motion on the throttle wire, but the stiff rod mechanism gives a push.

The G300 TD 96-00 had the OM606.964. If I buy a new pedal and wire for it, will it work with the mechanical pump? Or are newer pumps drive-by-wire?

Stretch · #4 04-18-2017, 09:29 AM

Quote:

Originally Posted by superapan

...

The rod system is also a bit complicated. I'll try to explain the best I can. In the W460 and you push the throttle, there's a sort of a lever mechanism that inverts the motion. In essence, I need a pull motion on the throttle wire, but the stiff rod mechanism gives a push.
...

Yep OK but if you have the space you can configure the cranks so there's a change of direction.

https://en.wikipedia.org/wiki/Bellcrank

There are some calculations if you're so inclined (pun intended!) here =>

Mechanisms

martureo · #5 04-18-2017, 10:16 AM

I found this video which shows what I'm doing on my w123 603 swap.

https://www.youtube.com/watch?v=-SYeITOnxYI

superapan · #6 04-19-2017, 02:43 AM

Quote:

Originally Posted by Stretch

Yep OK but if you have the space you can configure the cranks so there's a change of direction.

https://en.wikipedia.org/wiki/Bellcrank

There are some calculations if you're so inclined (pun intended!) here =>

Mechanisms

I obviously need a crash course in bellcranks, I'll look into it. Didn't realize the function was to change direction of motion.

Quote:

Originally Posted by martureo

I found this video which shows what I'm doing on my w123 603 swap.

https://www.youtube.com/watch?v=-SYeITOnxYI

Thanks for sharing! The pedal looks very similar to my W460. I do not see where you attach the throttle wire however, is it at the upper end of the "L"?

Stretch · #7 04-19-2017, 05:31 PM

Quote:

Originally Posted by superapan

...
Thanks for sharing! The pedal looks very similar to my W460. I do not see where you attach the throttle wire however, is it at the upper end of the "L"?

To me - it looks like in the last few seconds of the video the end of the attachment has a hole for the wire. The camera angle moves round so you can see the hole in the bulkhead and off to the engine bay.

Stretch · #8 04-17-2017, 09:47 AM

I'd stick with the rod system that's inherent to the older style. Work out the maximum travel needed at the pedal and at the throttle linkage - make up a bell crank to apply the correct travel. (I'm not quite sure where you'd mount it - post up some engine bay pictures if you need ideas)