Author Topic: Criteria for replacing 6.9 gine mounts  (Read 250 times)

raueda1

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Criteria for replacing 6.9 gine mounts
« on: 03 September 2019, 09:53 AM »
The mounts look to be in surprisingly good shape - not collapsed, cracked or otherwise distressed.  Rubber is still appropriately pliable, neither hardened nor softened.  I suspect that they were replaced at some point.  Is there a strong argument to replace them beyond the usual "it's easy when engine is out and they're pretty cheap, so why not?"  thanks,
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

Randys01

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Re: Criteria for replacing 6.9 gine mounts
« Reply #1 on: 05 September 2019, 03:44 AM »
They are absolute dogs to do in situ. I'm not sure if they are "cheap' but even if they are a King's ransom, do it now.

UTn_boy

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Re: Criteria for replacing 6.9 gine mounts
« Reply #2 on: 17 September 2019, 05:49 AM »
6.9 motor mount are no longer available, and haven't been in a few years.  Mercedes will not offer 6.9 motor mounts any longer.  Even so, you can use mounts for a 450se/sel.  Motor mounts can be deceiving.  They can look good, but as soon as the engine's weight sits atop they can collapse.  Especially if they're an aftermarket brand.  So, "when in Rome....." comes to mind.  RandyS isn't fibbing about how difficult they are to get to when the engine is installed.  If there is any argument then I imagine it's quite fitting regarding the aforementioned. 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

Mattr

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Re: Criteria for replacing 6.9 gine mounts
« Reply #3 on: 17 September 2019, 08:48 AM »
As someone who's running around with a broken motor mount on one of his cars, I'd say change it while it's easy.
1976 450SE 6.9 FrankenBenz (#2288?)
1977 450SEL 6.9 #2333

TJ 450

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Re: Criteria for replacing 6.9 gine mounts
« Reply #4 on: 29 September 2019, 05:36 AM »
It's when they are squashed or separated that they need to be replaced. The compound of the original 6.9 ones is a lot harder than the other versions, so although the 450 ones will work they may not last as long, but there isn't any other option.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

raueda1

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Re: Criteria for replacing 6.9 gine mounts
« Reply #5 on: 29 September 2019, 08:43 AM »
It's when they are squashed or separated that they need to be replaced. The compound of the original 6.9 ones is a lot harder than the other versions, so although the 450 ones will work they may not last as long, but there isn't any other option.

Tim
That's what I figured so that's why I asked.  Mine were NOT squashed or separated.  I got new ones anyway.  I'm going to do the thumb-press-durometer test on the old and the new and see how different they feel.  Guess I'll put the new ones in anyway.   Cheers,
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0