According to the FSM, W123 engine mounts are not compatible with W115 engine mounts because the shore hardness is different (I have attached the page for reference). I need new mounts in my 220D W115, and the dealer wants $150-$200 per mount. Via another source, Phoenix/OEM engine mounts are available for W123/W116 cars for less than $50 each.

Is this just Mercedes over-engineering everything? Do you think there is any harm in using a stiffer engine mount in my little 220D engine? I have a loping/hunting idle, and the idea of a stiffer engine mount sounds okay to me right now. My car aspires to be a daily driver, so ride quality is not a concern.

Has anyone tried using mounts intended for a different vehicle? Thanks.

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If they are the same physically I bet there would not be much difference. Does the W115 utilize the small engine shocks on the engine arms? If not then that might be why.

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'13 ML350 Bluetec - 95k - dad's (OC-98k)
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'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I believe that early w115 engines did not have an engine shock. The FSM gives guidance for retrofitting one, and my engine does currently have one engine shock. I do not think w115s ever had two like some of the later vehicles.

I looked up 70 220D in Fastlane, they only show one of the 3 listed.
Part# w0133-1630465 $21.49 ea.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

I was under the impression that the general consensus on the forum was to only use OEM engine mounts. There are a number of threads where people have had to replace aftermarket mounts very soon after installation. For that reason (and no offense intended to our hosts), I was trying to find either OEM or Phoenix mounts. So yes, the price of aftermarket parts is low, but I don't want to have to re-do this again any time soon.

For my OM617 into a R107 swap, I modified the stock mounts by filling with urethane.



I didn't do this to make them stiffer, although it's probable that that was the end result, but rather as "insurance" against the mounts collapsing. I'm running tighter than stock clearance between the pan and subframe and didn't want to risk a problem down the road. (the forums are littered with stories of collapsed engine mounts, particularly the newer ones of dubious origin and quality)

I can't say how much stiffer these are than stock as I've never driven a stock 123 for comparison (the donor car had completely collapsed mounts when I drove it home)

Based on my limited experience, I don't think you'll have any issues with the harder shore rating mounts.

I can say that I'm completely happy with the way the car drives with my "filled" mounts. Everyone's perceptions are different, so consider this just one datapoint among many... as they say, your mileage may vary.

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

I enjoyed the thread on the urethane addition to mounts. That is a great solution. Thanks for the reminder.

Which urethane did you uses; made by what company?
I must have missed the thread.

That is another way of eliminating the Shore hardness issue.

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84 300D, 82 Volvo 244Gl Diesel

On 617-952s the Dealer Mounts are made by Phoenix and their sort of warped Chevy Bowtie looking Logo is on the Mounts; Phoenix=Lemoferder with the Mercedes Star ground off. Both are made in Turkey.
Stock 84 300D Motor Mounts the same as Lemforder; pics show proof

“So after verifying that 300D mounts can be used on 240D cars, I ordered Lemforder mounts from Phil for $26 instead of $134 for OE. I just got them today. Found that they were made in Turkey.”
Lemforder Engine Mounts

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84 300D, 82 Volvo 244Gl Diesel

Thanks to all your replies, I figured out something which saved me a major headache. In my OP, I put an image from the FSM which starts talking about Shore hardness and then says that w115 engine mounts are not interchangable with w123 mounts. I mistakenly assumed that they were continuing the topic of Shore hardness. But I should have taken their statement literally. The mounts in my old 220D are fundamentally different than w123 mounts, which I didn't realize until today. Even the EPC uses virtually the same picture for w115 mounts as w123 mounts, but there are two major differences.

My left mount looks nothing like my right mount. It is smaller and squarish (and apparently harder to find according to Fastlane). The right mount looks very similar to the w123 mounts, but the bolt holes are offset from the center axis of the mount. So I was originally worried about rubber hardness, but I missed that the parts themselves are slightly different. Thanks to all you who helped me figure out my mistake and saved me parts $.

Fastlane claims it doesn't have the left mount in stock for my 68 220d. But when I use the part number (6152230112), it comes up without any image and has availability. I will have to contact Phil to figure that one out. It is made my SIP or SIP:KAR. Has anyone heard of SIP?

Diesel911-
The urethane reinforcement of engine mounts was mixed in with a discussion of making engine shock mounts from urethane. You were helping that OP with their engine shock mounts, and some others were discussing engine mounts. It was a confusing thread. Anyway, it can be found at:
Cheap engine shock mounts fix

There are several posts in my build thread of putting an OM617 in a 380SL that deal with the motor mounts. Here are the main ones (second one has the urethane source)

380SL Diesel Conversion Project thread
380SL Diesel Conversion Project thread
380SL Diesel Conversion Project thread

There quite a few comments interspersed that are worth looking for for someone considering this as a motor mount strategy.

There is also summary information here - SLDiesel.com/engine-trans

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Thanks.
I have seen articles on other Car Forums where Urethene Door/Window type Sealant was used to make whole Motor Mounts.
I was considering it as a way to rebuild the Engine Shock Mounts. The one has become expensive.

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84 300D, 82 Volvo 244Gl Diesel