Rear subframe cracks...

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John Green
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Rear subframe cracks...

Post by John Green » Tue 17 Feb, 2009 11:53 am

OK, so we all know about the front subframe issues with the SL and SLC's. But now it would appear that I have found a new problem with the rear subframe. Check out these pictures from a 350SLC that was towed in here on Friday last week.
DSC01140.JPG
DSC01141.JPG
DSC01142.JPG
And then the finished product, owner was hearing some funny noises for a week and then wondered why it had so much negative camber on the rear wheels.
DSC01144.JPG
Looks to me like the crack started at the holes for the front diff bolts, may be worth checking for all you W107 owners out there.... :?
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AndrewsSL/SEL
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Re: Rear subframe cracks...

Post by AndrewsSL/SEL » Thu 19 Feb, 2009 11:32 pm

Thanks for the heads up John! :shock: :shock:
Andrew

86 Diamond Blue 420SEL [That is being parted out and stripped for spares]
87 Red 190E 2.6 [Cossie Bodykit, R129SL 4pots/rotors, Bilstein/H&R suspension=GOKART]
87 White 300SL R107 Roadster [Which has sadly become a bit of a garage queen]
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Re: Rear subframe cracks...

Post by AMG » Sat 21 Feb, 2009 7:31 am

Definitely unusual. I wonder if that particular vehicle was ever involved in a rear-end collision at some stage, or if this is more likely to age / lack of maintenance ?
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Vogue SE 4sp auto Ardenne Green "Oswald"
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.

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Re: Rear subframe cracks...

Post by John Green » Sat 21 Feb, 2009 9:11 am

From what we could see the rear floor pans were fine, no evidence of repair and things like the subframe mounts and diff mount were fine......

Another interesting point is that when you look up the replacement part on the EPC you find that it has had the same part number since day one, in other words MB have never flet the need to modify the original design. So must not be a common issue...
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Re: Rear subframe cracks...

Post by AMG » Sat 21 Feb, 2009 9:32 am

I guess one conclusion which could be drawn from that is that the vehicle may have had a hard life in it's travels and that the cracking was likely due to fatigue.

Still, not a bad effort when you consider the age of the car. It's certainly the first time I've seen or heard of it, and there were a lot of 107's made over those 18 years.

Rare occurrence though it may be, I'll still be checking Lurch & Stella out when I get home :)
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Vogue SE 4sp auto Ardenne Green "Oswald"
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.

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Re: Rear subframe cracks...

Post by merclover » Thu 05 Aug, 2010 7:09 pm

Thanks for that john il check mine out tomorrow cheers.

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Re: Rear subframe cracks...

Post by Mercmad » Sun 17 Jun, 2012 8:40 pm

I've never heard of it before . That car might have been used in the outback?
Normally 107's rust away before fatigue becomes a problem. :laughing6:
heres one I saw on my visit to the mercedes graveyard ..Nice rust free 450 but no interior....
John Freemans place 2012 078.jpg
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Re: Rear subframe cracks...

Post by CraigB » Mon 18 Jun, 2012 12:00 am

Not sure where all the stresses are in these, but for example if a bolt wasn't correctly tensioned over many years and therefore minor movement/vibration, could that explain something like this?
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Re: Rear subframe cracks...

Post by John Green » Mon 18 Jun, 2012 7:29 pm

Well it has been three years since that job, but from memory the diff bolts were all tight. Your theory however is quite possible...
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Re: Rear subframe cracks...

Post by AMG » Wed 07 Jun, 2017 8:42 pm

Figured I better close the thread off with the factory service manual documentation regarding subframe dimensional tolerances.
33-600.pdf
35-410.pdf
35-420.pdf
35-430.pdf
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Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Vogue SE 4sp auto Ardenne Green "Oswald"
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.

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