Do Motor Mounts go bad too? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 07-12-2019, 09:17 AM Thread Starter
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Do Motor Mounts go bad too?

Reason I'm asking is because when I slowly get on the gas from a stop, I can feel the engine rock backwards as momentum starts to move forward...I don't remember feeling that before. It is very apparant that something of big mass is slowly rocking backwards as I accelerate. Truck is an 08 with 90k miles almost.

Or would that be the body / cab mounts that could cause that? Everything suspension, bushing, wheel/tire related is all stock and original, never replaced.
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post #2 of 13 Old 07-12-2019, 10:52 AM
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Yes motor mounts will go bad. You can sometimes look and see the rubber in them falling apart.

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post #3 of 13 Old 07-12-2019, 10:58 AM Thread Starter
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Guess I'll take a look and see what I find. Is it just one on each side? Are they just as hard to change as the body mounts are?
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post #4 of 13 Old 07-18-2019, 05:42 AM Thread Starter
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So my motor/trans mounts look just as good as all the body mounts, all original, no cracked or rotted rubber. They are all solid, and none of the bolts/nuts were loose or had moved. What else could cause this slight rock back motion when I get on the gas?

Could my shocks be causing it? They are the originals, all rusted out wtih 90k miles on them...I'm sure they are gonners. Any other bushings or linkages I should check?
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post #5 of 13 Old 07-18-2019, 05:52 AM
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It’s a little far, but check your cab mounts. They are a common replacement. Maybe you can feel the cab “lift” a little when giving it gas? There are multiple running down the truck and they wear out, crack and fall apart, leaving the cab bolts not as tight as they should be
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post #6 of 13 Old 07-18-2019, 06:31 AM
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Trans mounts?
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post #7 of 13 Old 07-18-2019, 09:39 AM Thread Starter
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Quote:
Originally Posted by colesalisbury01 View Post
It’s a little far, but check your cab mounts. They are a common replacement. Maybe you can feel the cab “lift” a little when giving it gas? There are multiple running down the truck and they wear out, crack and fall apart, leaving the cab bolts not as tight as they should be
Thank you. I did check all 8 cab/body mounts, 4 on each side. I fully expected them to be rotted seeing some of the horror videos of them crumbling apart. But mine all looked brand new, not a single crack in any of the rubber. All looked like originals too. Not sure how so many people have them rotting away!

Maybe I should check the bolt torque on them...I think it's 80 ft-lbs right?
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post #8 of 13 Old 07-18-2019, 09:41 AM Thread Starter
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Originally Posted by White_Buffalo7.3 View Post
Trans mounts?
I checked what I could see of the trans mount...it's pretty hidden by the metal mount. The rubber was all there and not separated. And the mount bolts were all firm and hadn't moved. Is there a better way to check it without pulling it out?
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post #9 of 13 Old 07-19-2019, 04:00 AM
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I would check the carrier bearing on your drive shaft too. I had one go bad in my 04 and it felt like there was a rocking motion when you took off from a stop.

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post #10 of 13 Old 07-19-2019, 04:15 AM
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A mount that is rotting away is obviously bad, but a mount that isn't rotting away isn't necessarily good.

I used to work for a Tier 1 automotive OEM mount supplier. Conventional mounts have about a 10 year life span. That can be even less with extended idling. After that length of time/usage - in many cases - a hunk of 2x4 might get you as much isolation.

That wasn't some manufacturers recommended change-out. Nobody gives a crap about mounts and they are rarely, if ever, changed. They was just the pragmatic view of their lifetime.

That said... aging mounts typically don't get more compliant. They get less. So, in this case, I might look elsewhere. But - to the question of whether the mounts are "good" or not - probably not. ...they just aren't causing the problem described.
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