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  #1  
Old 12-28-2020, 08:29 PM
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New to me 300td with 300sd engine. Anyway to fix SLS? And other questions?

PICS AND CURRENT QUESTIONS AT BOTTOM OF FIRST PAGE


Finally got back in the Benz game got a fixer upper wagon with a "125k" 300sd and tranny engine swap.

Runs good enough. First question is there anyway to retro fit the sls system on the non equiped engine? Or do I need to do the new struts? If so which ones do I need and does anyone have opinion on it (I have heard bad things)

Second issue off the bat is that I can't figure out if it's getting into top gear on the freeway. I've had 3 non turbo w123 in the past and know they rev up really high on the freeway. Just can't seem to remember what the "normal" sound is like. I will count the shifts, just confirming it starts in second gear when it drive? and has 4 total gears?

Last thing is the speedo and odo don't work I remember the cable for a 300sd being different from a 300d and am assuming this is the issue? Anyway to fix this?


Im sure I'll have more questions as I go but this is a good start.

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Last edited by tdoublenastywitit; 01-04-2021 at 12:03 PM.
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Old 12-28-2020, 09:00 PM
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Quote:
Originally Posted by tdoublenastywitit View Post
Finally got back in the Benz game got a fixer upper wagon with a "125k" 300sd and tranny engine swap.

Runs good enough. First question is there anyway to retro fit the sls system on the non equiped engine? Or do I need to do the new struts? If so which ones do I need and does anyone have opinion on it (I have heard bad things)

Second issue off the bat is that I can't figure out if it's getting into top gear on the freeway. I've had 3 non turbo w123 in the past and know they rev up really high on the freeway. Just can't seem to remember what the "normal" sound is like. I will count the shifts, just confirming it starts in second gear when it drive? and has 4 total gears?

Last thing is the speedo and odo don't work I remember the cable for a 300sd being different from a 300d and am assuming this is the issue? Anyway to fix this?


Im sure I'll have more questions as I go but this is a good start.
The SLS pump is mounted onto the cylinder head and I believe the head itself is different for sls cars vs the non-sls with mounting for the pump for the sls cars.

You should have around 3k rpm at 70 mph

The 300SD doesn't use a speedo cable. It has a magnetic pickup in the output shaft for the electronic speedo.

So if the tranny is from a SD then you may have a problem. At a minimum you're looking at swapping the tailshaft housing/speedo drive. Unless you swap speedos and do some electrical wiring. Although I'm not sure how that will look/work
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Old 12-28-2020, 09:05 PM
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You can use a power steering pump with the hydraulic suspension pump mounted integral. Some PS pumps are dual I may have one just let me know.
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Old 12-28-2020, 09:09 PM
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Originally Posted by dieselbenz1 View Post
You can use a power steering pump with the hydraulic suspension pump mounted integral. Some PS pumps are dual I may have one just let me know.
I think they usually came later on cars equipped with a serpentine belt?.

He has an OM617 so it's all V-belts
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  #5  
Old 12-28-2020, 10:53 PM
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Yes curious to know if this power steering method will work??

Also really curious on anyone who has done the delete to chime in. I've just heard it's really bouncy in the rear end

if I don't hear a simple answer I may try to swap in the speedo from a junk yard w126 into the w123 cluster. seems cheap enough to try.

As for 70mph is 3k rpm this doesn't help because for some reason this cluster doesn't have a tach. It's the stupid cluster with the clock. Seems like I have a day a digging thru the junkyard and frankensteining a custom cluster together

EDIT: Oh and yes I was told the tranny is from w126 1982 300sd although this has yet to be confirmed. (Just got the car today)
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Old 12-28-2020, 11:11 PM
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Yes 3 shifts, 4 speeds/gears. Select low from a stop, this should put the car into first gear, go back to drive and see how many shifts. It should be three.

Anybody...will the W123 V PS pulley go onto a W124 serpentine dual pump? Next question is will the V pulley on a serpentine dual pump align with the V belts?

I've seen diesel heads with what looks like a block off plate where the SLS pump mounted. Does yours have one?

Good luck!!!
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Old 12-28-2020, 11:47 PM
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Quote:
Originally Posted by Sugar Bear View Post
Yes 3 shifts, 4 speeds/gears. Select low from a stop, this should put the car into first gear, go back to drive and see how many shifts. It should be three.

Anybody...will the W123 V PS pulley go onto a W124 serpentine dual pump? Next question is will the V pulley on a serpentine dual pump align with the V belts?

I've seen diesel heads with what looks like a block off plate where the SLS pump mounted. Does yours have one?

Good luck!!!
Thanks for the help. I will look and see if it had a block off plate or not. will check back in soon.

Thanks.
-Todd
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  #8  
Old 12-29-2020, 12:19 PM
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What year is the wagon?
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Old 12-29-2020, 12:29 PM
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What year is the wagon?

If the trans is from a 300SD, it uses an electronic speedo. The only w123 that has this setup is a 1981 300TD. They also did not have tachs, so you may be in luck. Pull the cluster and take a look on the backside.

Pics?
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1987 300TD Smoke Silver
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1983 300TD Reed (Moss) Green / Dark Olive MB Tex Euro spec

1983 300TD Silver Blue / Blue cloth Euro spec, OM648 and 722.6, 15" hubcaps, W126 S2 brakes
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  #10  
Old 12-30-2020, 11:16 AM
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Quote:
Originally Posted by h3ffe View Post
What year is the wagon?

If the trans is from a 300SD, it uses an electronic speedo. The only w123 that has this setup is a 1981 300TD. They also did not have tachs, so you may be in luck. Pull the cluster and take a look on the backside.

Pics?
Oh ok I may be lucky then. Because the title says the wagon is 1981!! So your saying if it is the stock speedo that it should be plug and play with the 300sd tranny?


Is there an easy way to install a tach I would like to have one. I know you can hardwire it to the alternator or something and I can do the research on how to do that. I'm most just asking if there is a plug and play way to do it with the 300sd engine and getting a taxh from another cluster?

EDIT: I bought the car the day before I went on vacation (I'm on the vacation right now) so I'll get pics of everything when I get back and be able to poke around and give more updates to the thread.

It would be nice to confirm it is a 300sd engine and trans and etc.
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Old 12-30-2020, 11:22 AM
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And I really want to get the rear facing seats (I don't care if they are not safe to sit in lol)

If I sourced them can they be installed on this 1981 wagon easily and/or do I need a bunch of hardware too? Where do the seatbelts connect?

(If anyone has a third row seat in the classic mb Tex tan I want to buy it)
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Old 01-01-2021, 12:51 PM
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I’ve heard here a long time ago of people using convertible top pumps off a GM car. I wish I still had my wagon to try this on. The SLS pump gets you backed into a corner due to the special head with regards to donor motors. I like to fantasize how I could have put a turbo engine in mine and used an electric pump with a toggle switch or pressure switch to handle sls.

Oh well I’m done with wagons.
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  #13  
Old 01-02-2021, 10:33 AM
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ya I was thinking that there has to be some way to rig something up to make it all work
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Old 01-03-2021, 06:14 PM
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Quote:
Originally Posted by tdoublenastywitit View Post
And I really want to get the rear facing seats (I don't care if they are not safe to sit in lol)

If I sourced them can they be installed on this 1981 wagon easily and/or do I need a bunch of hardware too? Where do the seatbelts connect?

(If anyone has a third row seat in the classic mb Tex tan I want to buy it)

Rear facing seat are very easy to install. Half of the seatbelts bolt to the floor. The other halves bolt to the C-Pillars, so you'll need to either get C-Pillar trim from a 300TD that had a 3rd row seat, or modify your C-Pillar trim, or remove and discard the C-Pillar trim.



I installed 3rd row seats in my hooptie but have yet to find the C-Pillar seatbelts.
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  #15  
Old 01-04-2021, 11:51 AM
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Rule #1, don't freak out.
 
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Sorry for the crap quality but I took those pics at dusk hopefully good enough for now.

I have 3 current questions/problems that need to be solved.

1st is the needing to do the SLS delete because the new. engine. I am leaning towards getting w140 springs and the bilstein hd shocks.

W140 Non-SLS Heavy Duty Springs | Lesjofors 4256869
300D Rear Shock Absorbers | Bilstein HD 24-007146

It's only about $275 in parts

The other option I'm considering are the "custom made" sls delete springs on SLSconversion.com Although just for the springs alone it's $300 and then I still have to buy the bilsteins seperatly. Although the guy is really cool and will answer and questions I have.


Has anyone used either of these methods and can comment on them?? Is there one method you would stand behind more firmly, pun intended! Basically which one is less bouncy.

I don't want to mess with getting a aftermarket hydrolic pump or anything. I am pretty much dead set on doing to conversion.


2nd Problem.

I am 95% sure the trans is not getting into 4th gear. It sounds like it is going to explode when I'm driving on the freeway and when at highspeeds and shift down to "S" position it doesn't shift down into a lower gear it just stays the same.

Ive had trans problems on a few w123 in the past but everytime I just adjusted to modulator on the trans and it fixed the problem. This time I've turned the modulator 6 or 7 clicks clockwise (one click at a time) and nothing changes.

I hooked a moth vac up to the mod on the trans, it holds vacuum. I also drove on the freeway with the mity vac hooked up and pumped it up when I was at highway speed and the trans still wouldn't shift into 4th.

Tranny also flares for a half second or so when I accelarate fast.

Are all of my vac lines at the 3/2 valve correct?? Don't understand why there are 5 ports but only 2 lines and I'm not sure if the lines are in the correct place. And could this stop the trans from getting into 4th gear??


3rd Issue (which also ties into diagnosing the second problem)

Seller says this is 1982 300sd engine and transmission. Can anyone confirm this by looking at the pics alone?

I've never had a turbo om617 before just a lot of non turbo. Am I correct when I see that this engine has the 1979 non-egr manifold installed?? Or am I missing something?

Any other tid bits about what engine and trans I have that could help me solve my "not getting into 4th gear" transmission problem and other issues down the road would help.


Thanks.
-Todd

please excuse the typos I'm posting on my phone

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