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suspension wont rise

Author Topic: suspension wont rise  (Read 3451 times)

daantjie

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Re: suspension wont rise
« Reply #15 on: 17 September 2016, 01:42 PM »
Nice! Might have been the switch cleaning that did the trick methinks.
Daniel
1977 450 SEL 6.9 - Astralsilber

rumb

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Re: suspension still needs work
« Reply #16 on: 22 September 2016, 04:51 PM »
Finally got to drive the car about 8 miles!

Engine runs smooth, though I have rebuilt the spare AAV and waiting on a gasket and hose to reinstall and then be able to adjust the idle down to where it should be.

The suspension is smooth and gets to the correct height, though driving below 1500 rpm the red light comes on, when I get to about 1800-2000 it goes out. I noticed that when I turn the car off I hear a hissing or fluid flowing noise from probably the rear height controller and the car will drop about an inch in the rear.  I am guessing that means there is an internal leak in it that need to be looked after.

one of the rear hydro struck has a decent leak, so will need to swap in one of my spares and hope that one is better condition.

The main fuel line into the fuel distributor cracked right near the metal portion. I am trying to splice in a temporary patch line but still getting a drip, so I need to solve that before I can drive anymore.  Those 2 fuel lines look like a pain to get out.  I have found metric hose and the original hose collars.  Has anyone ever used them to rebuild these lines?  I dont want to buy their $1600 crimper, so I will have to figure something else out. https://www.belmetric.com/crimping-tool-cohline-c-14_1318/cohlcrimp-cohline-crimping-tool-p-7987.html?zenid=af5rgt5eoo0cf0t20rl2jqpjh6

https://www.belmetric.com/hose-collars-c-14_1319/?zenid=af5rgt5eoo0cf0t20rl2jqpjh6



'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

UTn_boy

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Re: suspension wont rise
« Reply #17 on: 22 September 2016, 05:02 PM »
Well, the rear hydraulic ram that is leaking is likely your problem as to why the light is coming on and why the car falls after you turn it off. 

Regarding the fuel lines, if you're talking about the rubber ones  they just buy new ones.  They're still available.  If you have access to underneath of the car, it's not a bad job......provided they're not rusty, of course. 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1971 280sel Black/black leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex

rumb

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fuel lines
« Reply #18 on: 22 September 2016, 06:24 PM »
feed line 116 470 57 75 is NLA
return 116 470 50 75 is still available

I found this:
http://www.m-100.cc/forum/topic.asp?TOPIC_ID=8220

My local NAPA can probably crimp new hoses on for me, but the end crimp part is different from stock, though if I put new sleeving on it, it will be covered up and no one will know for about 40 more years.

I just placed an order for both lines, we'll see what they have.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

daantjie

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Re: suspension still needs work
« Reply #19 on: 22 September 2016, 06:51 PM »
Finally got to drive the car about 8 miles!

Engine runs smooth, though I have rebuilt the spare AAV and waiting on a gasket and hose to reinstall and then be able to adjust the idle down to where it should be.

The suspension is smooth and gets to the correct height, though driving below 1500 rpm the red light comes on, when I get to about 1800-2000 it goes out. I noticed that when I turn the car off I hear a hissing or fluid flowing noise from probably the rear height controller and the car will drop about an inch in the rear.  I am guessing that means there is an internal leak in it that need to be looked after.

one of the rear hydro struck has a decent leak, so will need to swap in one of my spares and hope that one is better condition.

The main fuel line into the fuel distributor cracked right near the metal portion. I am trying to splice in a temporary patch line but still getting a drip, so I need to solve that before I can drive anymore.  Those 2 fuel lines look like a pain to get out.  I have found metric hose and the original hose collars.  Has anyone ever used them to rebuild these lines?  I dont want to buy their $1600 crimper, so I will have to figure something else out. https://www.belmetric.com/crimping-tool-cohline-c-14_1318/cohlcrimp-cohline-crimping-tool-p-7987.html?zenid=af5rgt5eoo0cf0t20rl2jqpjh6

https://www.belmetric.com/hose-collars-c-14_1319/?zenid=af5rgt5eoo0cf0t20rl2jqpjh6

The slight drop is normal when you get out of the car as the axle is being unloaded thus the leveling valve is readjusting itself. Red light coming on means pressure in the main accumulator is not being sustained. Points to weak pump or faulty pressure regulator or both. Or trouble with the height control switch.
Daniel
1977 450 SEL 6.9 - Astralsilber

UTn_boy

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Re: suspension wont rise
« Reply #20 on: 23 September 2016, 06:47 PM »
It's a shame that something like a fuel hose is no longer available.  I recently learned that Mercedes discontinued rear brake pads for W108/W109/R113.  Things like that do't make mush sense. 

Daantjie, he mentioned that one of the rear hydraulic rams was leaking.  We can't yet rule that the pump or pressure regulator are problematic until the system holds fluid in under pressure. 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1971 280sel Black/black leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex

rumb

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Re: suspension wont rise
« Reply #21 on: 24 September 2016, 06:46 AM »
I've read about the process and difficulty find parts to rebuild from rams, but has anyone rebuilt a rear?  I know there are probably orings and teflon rings.  Would just replacing the orings be sufficient to get a ram in working / nonleaking condition?  Since I have spares and one known leaker, I think I will see what I can do with the bad one. I would think the orings do more to control leakage than the teflon rings.

The dealer replied to me that both fuel lines were NLA despite MB saying the return was still available.  I asked them to check again, and I will also ask the classic center as they are better at getting parts from germany.

'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

rumb

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Re: suspension wont rise
« Reply #22 on: 24 September 2016, 06:50 AM »
.............
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

daantjie

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Re: suspension wont rise
« Reply #23 on: 24 September 2016, 06:57 AM »
The feed line is NLA for sure. You can get the proper Cohline polyamide lined hose from www.belmetric.com.
Some leakage at the strut is normal. Have you done a 12 hour leak down test as per the manual?
Daniel
1977 450 SEL 6.9 - Astralsilber