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  #1  
Old 07-01-2008, 03:21 AM
Unofficial wormcan opener
 
Join Date: Dec 2005
Location: Ashland, MA
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Strange SLS leak 300TD 124

We headed out for a long weekend on Friday. The trip included going over a 4,000' pass. It was about a 3 hour drive. When we arrived on the other side of the pass, I noticed some fluid on the back window. I also noticed that my SLS tank was low and it smelled like that fluid.

I found a quick change oil place that was open on Saturday. They had a mechanic on duty and he let me pull the car into a bay and walk under it with him. It appeared that the valve in the rear was leaking from the top. He tried to tighten the lines, but they were all tight.

The SLS tank still had some fluid in it so we returned home Sunday night. I left the car in the driveway and checked it Monday morning. The drive way was dry. I had a quart of fluid in stock, so I added it to the tank which was enough to get it up to the full line. I drove the car around today on the freeway and in town and there is no sign of a leak.

So would going up to 4,000 feet and back down cause the valve to leak. There is a bleeder on top of the valve. I have the car at my indie so maybe he will find something tomorrow.

I didn't have much weight in the car. 100 pounds total in rear seat passengers (my kids), a couple bikes on the roof and 2 bags and a bike seat in the back. Two days before I had myself and 4 adults in the car without any problems.

Any ideas?

Chris
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Old 07-01-2008, 10:26 AM
Registered Hack
 
Join Date: Mar 2008
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my only guess would be the diaphragms in the nitrogen spheres are now softened with age and the excess altitude caused the nitrogen to expand putting more back pressure on the system.

or.. your system is not properly bled and the same happened to this trapped air b/c of altitude.
however, 4000 ft is not that severe. Just trying to help.
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Old 07-01-2008, 10:30 AM
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Is the SLS on a w124 a closed system?

On the w123's the SLS is self-bleeding and any air in the system will burp out into the reservoir through the return line.
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Old 07-01-2008, 10:33 AM
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I did change the valve about 6 months ago. I thought I read on here that the SLS system was self bleeding. I asked one of my smart friends about it and after explaining the system to him, he said the same thing about the nitrogen. He also added that 4,000' was not that high. I suspect my spheres are trying to tell me they want to be replaced. I had that on my to do list.
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“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
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  #5  
Old 07-01-2008, 10:36 AM
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Quote:
Originally Posted by Chad300tdt View Post
Is the SLS on a w124 a closed system?

On the w123's the SLS is self-bleeding and any air in the system will burp out into the reservoir through the return line.
I'm pretty sure the 124 is the same as the 123. The pump and the rear proportioning valve are different, but the rest of the system is the same.
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

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  #6  
Old 07-01-2008, 10:39 AM
Registered Hack
 
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i think Chad is right. ANd the nitrogen theory is wrong also. It would only cause a higher reserves in the reservoir and a stiffer ride.

my only other guess is heat thinned the fluid and softened the seals - the heat was a summer / constant grade driving issue.
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