450SLC rebirth

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Citrus107
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450SLC rebirth

Post by Citrus107 » Tue 06 Feb, 2018 8:39 am

Hi all
I am in the process of starting a 450SLC that has been parked up for ten years. The fuel system is completely gummed up and I am in the process of stripping, cleaning, and rebuilding.
The question:
While rebuilding the fuel pump, I noticed a small cylindrical element plumbed from the pressure side of the pump/filter/accumulator back to the inlet.
The fuel pump has an internal pressure relief valve, and there is system pressure relief on the fuel distributor as well.
I can't think of any purpose that this element could serve other than being an additional pressure relief valve, yet have not seen one in any documentation.
Does anyone out there know what this thing is; and if it is a relief valve, what pressure it should open at (so I can test it)?
Cheers
Citrus107

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Chai
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Re: 450SLC rebirth

Post by Chai » Wed 07 Feb, 2018 10:53 pm

A picture of the part in question will help us identify it. I think the item you are referring to is the fuel damper.

Also, what is the build year of the 450SLC?
Chai
1974 450SLC

Citrus107
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Re: 450SLC rebirth

Post by Citrus107 » Thu 08 Feb, 2018 7:19 am

Hi Chai
This is the assembly that I pulled out of the car. It's a 1979 Aussie-build 450.
As I understand it, the damper is the item partly seen at the top.
The element in question is the small diameter one between the accumulator and filter which is plumbed from high to low pressure.
I hope this helps.
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Christo C
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Re: 450SLC rebirth

Post by Christo C » Thu 08 Feb, 2018 10:28 am

Could it be a Valve, as per Assembly No 14 in this diagram?
https://www.ilcats.ru/mercedes/?functio ... anguage=en
~Christo
1986 230E W124.023 M102.982 ~290,000km Thistle Green Saloon "Janis"

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AMG
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Re: 450SLC rebirth

Post by AMG » Thu 08 Feb, 2018 8:05 pm

Footnote:
Screen Shot 2018-02-08 at 20.02.52.JPG
Part number & diagram:
Screen Shot 2018-02-08 at 20.03.05.JPG
The best thing to do is get yourself a copy of the MB factory service CD manual for your model vehicle.
Call the forum sponsor, they usually have a copy in stock.
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Citrus107
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Re: 450SLC rebirth

Post by Citrus107 » Sat 17 Feb, 2018 6:20 pm

Thanks for the advice.
I did contact the sponsor about the CD, but none available.
I have one on the way from elsewhere.
Judging by the fun that I'm having identiying the actual wiring of this car from the literature I have on hand, it will be very helpful there too.
Cheers

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