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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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Old 16th February 2018, 04:46 PM
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Default Australian 6.9 low in rear but OK in front; also goes to High position at front

Hi All -

I've been away for 3 weeks and came back to a very low rear end on the 6.9 (left and right).

When idling, it maintains normal height in the front (even left and right) and also responds to the raised H position at the front only.

There's no leak from back struts so I wonder if the back valve has stopped working while unused for that 3 week period? Or is it another easy fix?

Any help on the initial approach to the problem would be appreciated before I insert blocks and tow to workshop.

Thanks and regards.
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450SEL6.9 - #4811 Classic White/Parchment velours, AUS delivered 1978
450SLC - Citrus Green/Parchment leather, AUS delivered 1979
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Old 16th February 2018, 05:28 PM
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Default Re: Australian 6.9 low in rear but OK in front; also goes to High position at front

Hi David, first thing to check is that the link is attached to the rear level valve . May have broken the plastic ball joint
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Old 16th February 2018, 05:39 PM
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Default Re: Australian 6.9 low in rear but OK in front; also goes to High position at front

If the fluid's dirty or has't been changed in years it could be a blockage. If not it'll probably be leak-back through the rear valve since the problem is common to both struts. Carefully try bleeding the system at the rear valve and see what you get.
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Old 17th February 2018, 04:50 PM
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Default Re: Australian 6.9 low in rear but OK in front; also goes to High position at front

Thank you both.
Peter: I've checked link - it's intact.
Mark: I suspect dirty fluid. I will probably start with a drain/flush/refill, before tackling any hardware.
Cheers.
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450SEL6.9 - #4811 Classic White/Parchment velours, AUS delivered 1978
450SLC - Citrus Green/Parchment leather, AUS delivered 1979
C200 (W205) - 2015
B200 (W246) - 2015
______________________________
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Old 17th February 2018, 05:16 PM
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Default Re: Australian 6.9 low in rear but OK in front; also goes to High position at front

Hi David, sorry to be a little slow in responding. Short of checking the system with pressure gauges, one can start checking some functions by undoing various plugs and/or piping to determine if there is pressure, or if there is an air lock.

Am I right in assuming that the aircells have recently been renewed ? If so, the system has probably been disturbed to some degree. First of all, disconnect the wire cable from the disc sitting atop the distribution valve. Ensure that there is resistance when you move the disk from normal to static position, and then to the high position and back again. There must be resistance.

Next step is to undo the 12mm plug that's attached to the control valve on top of the reservoir. Initially, with engine turned off, remove that closing plug, withdraw the very small gauze filter that's behind the plug and check the interference fit of the rubber 'O' ring that is attached to the plug. Once you have cleaned the filter, replace refit plug and tighten firmly. Start engine, observe operation of disc (there should be resistance when turning), and slightly undo that closing plug - not by much, observe if pressurized hydraulic oil will want to spurt out, and if it is, retighten that closing plug whilst engine is still running. Try and take the car for a drive in the hope that suspension movement will " wake up" the system and rtaise the rear level back to its normal height. Of course, please feel free to phone me. Best of luck, Styria.
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Old 17th February 2018, 05:33 PM
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Default Re: Australian 6.9 low in rear but OK in front; also goes to High position at front

Thank you, Michael.

I'm packing to travel again in the morning but will be able to lift the bonnet/hood again on Friday and try this out. There used to be good resistance when turning the disk atop the reservoir. Now there isn't. I had noticed this only recently and wondered aloud if this suggested a fluid problem. No, I haven't replaced the cells yet, although they must be done. Firstly I have to get the old girl up off my garage floor; my younger neighbour thinks it looks "wicked" in its current stance! (there is currently 3/4" clearance under the intermediate silencer!).

She turns 40 in August and I am planning a party with lots of presents (accumulator cells, new tyres, air-cond regas etc.!).

Your sage words are, as always, much appreciated.

I'll keep you posted.

Cheers.
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David
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450SEL6.9 - #4811 Classic White/Parchment velours, AUS delivered 1978
450SLC - Citrus Green/Parchment leather, AUS delivered 1979
C200 (W205) - 2015
B200 (W246) - 2015
______________________________
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