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Old 02-25-2014, 03:25 PM   #11
Anthony2816
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Noob question: Assuming RMM means rear motor mount, why exactly would I want to replace it on my 2013 ST? What would be the benefit?
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Old 02-25-2014, 03:43 PM   #12
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Yes. RMM = rear motor mount

Basically, if your ST was built on or before 8/27/13, it would have the original RMM that many people deem is too soft. Many have complained that because of how soft it was, on hard/fast shifts (mostly between 1st and 2nd gear), the motor mount would give way too much and the motor would bang against the firewall. A TSB was released to change this mount for those who were consistently having this issue.

However, some people still run the older mounts and are fine with it while others consistently had a shift-bang with hard acceleration. Some others, even with the upgraded mount, still feel that it is too soft and have an audible thud on hard shifts.

If you don't really have any problems with it, then you should be ok.

Otherwise, there are several aftermarket mounts that are available, all are stiffer which would contribute to NVH at varying degrees. I had considered replacing mine with the Boomba RMM (similar to the CPE one, but much cheaper in price - not quality though).
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Old 02-26-2014, 01:17 AM   #13
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Hmm, have never been aware of a banging noise like that, but now that I know what to look for I'll pay more attention. Thanks.
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Old 02-26-2014, 11:57 PM   #14
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even if you don't drive hard regularly your ST will shift better and wheel hop will be all but eliminated. at a minimum I would get the TSB electric mount.
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Old 03-03-2014, 10:00 AM   #15
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Quote:
Originally Posted by GoldenHour View Post
at a minimum I would get the TSB electric mount.
What's that?

In any case, I tried doing some hard acceleration from stop, and while still in first heard a rapid series of three loud bangs from the engine. In the rare times I'd heard something similar in the past, I'd thought it was wheel hop, but is it more likely that it's the RMM problem?

Looks like my dealer is willing to replace the RMM for me, but now I want to know what you're referring to, GoldenHour.
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Old 03-04-2014, 02:47 AM   #16
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TSB updates to the rear motor mount from the Focus electric, or "E-RMM" as I understand it.

He wrote it TSB Electric mount.
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Old 03-04-2014, 05:12 AM   #17
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Quote:
Originally Posted by sailor View Post
TSB updates to the rear motor mount from the Focus electric, or "E-RMM" as I understand it.

He wrote it TSB Electric mount.
Thanks, Sailor.
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Old 03-04-2014, 08:12 AM   #18
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Quote:
Originally Posted by sailor View Post
TSB updates to the rear motor mount from the Focus electric, or "E-RMM" as I understand it.

He wrote it TSB Electric mount.
Quote:
Originally Posted by Anthony2816 View Post
Thanks, Sailor.
It was much more extensive than just changing the rear engine mount. On the 2013 cars it changed every engine mount, passenger side, transmission side, rear roll restrictor, and the hydraulic tube between the trans and the slave near the transmission side mount. On the 14 built before 8/27/13 it only replaced all the Motor mounts.
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Old 03-04-2014, 11:37 AM   #19
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Quote:
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It was much more extensive than just changing the rear engine mount. On the 2013 cars it changed every engine mount, passenger side, transmission side, rear roll restrictor, and the hydraulic tube between the trans and the slave near the transmission side mount. On the 14 built before 8/27/13 it only replaced all the Motor mounts.
So the dealers are doing all that for free, as with a recall? Do you have the service bulletin number so I can give it to my dealer?
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Old 03-04-2014, 03:37 PM   #20
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Quote:
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So the dealers are doing all that for free, as with a recall? Do you have the service bulletin number so I can give it to my dealer?
It's a technical service bulletin, used to be 13-6-10 but has since been superseded by tsb 13-12-03. Of course you have top demonstrate the issue unless your dealer skirts Ford's policies, but yes the repairs should be at zero cost to the owner of the car.
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