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Old 01-26-2010, 09:30 AM   #1
FRDPLAY
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Perplexing Noise 04 SVT Focus

All,

I recently had a clunking noise coming from my car. I pulled the front pass. side shaft to see if the joints were binding, it was fine. I replaced the bearing on the saft and re-installed. The noise was still there. I then replaced the drivers side motor mount (under air-box) and "yeah" problem solved... HOWEVER, I now have a new noise that I can determine where it's coming from.

When running the car in either second or third gear and I get to it up around 4,000 rpm's I get a pretty loud HUMMM noise in the car. When depressing the clutch and holding the RPM's in the same area, the hum stays there. I can even come to a complete stop and rev up the motor and hear the same noise, however it's considerably less noticeable. Turning the car left and right while the hum is active does nothing.

The driver side motor mount has 4 mounting holes that are slotted. Does another know if there is any alignment procedure that needs to take place when replacing that mount? I'm wondering if the noise is coming from the engine vibrating on something, causing this "hum" at X rpms. It can't be the bearing on the dirveshaft, as I can slightly hear the noise at a stopped position.

Anyone have any ideas, or suggestions? Does the motor need to be aligned with the drivers side mount?

Thanks.


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Old 01-26-2010, 10:19 AM   #2
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I've had a similar problem occuring at 3000rpm. Everytiem the car crossed that RPM i heard a noise. Nothing after that or before that point. It ended up being by flexpipe. THe mesh around it was becomming loose causing the hum under that RPM. after throwing a clamp around the middle of the mesh to fasten the mesh to the flex the sound went away.

Im guessing due to the heat and cooling the mesh around the flexpipe expanded and created a humming between the inner tube and the mesh. once the 2 pieces were fastened together there was no room for vibration and thus eliminating the problem.

GL,

Adam
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Old 01-26-2010, 10:51 AM   #3
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My normal procedure for replacing a motor mount is to loosen the other mount so it isn't pre-loaded at any odd angles that could cause excessive vibration. I'm not sure where exactly in the slots the bolts should be... I just try to line them all back up to the positions they were in, which is easy to tell by wear in the paint.

Last edited by CaysE; 01-26-2010 at 01:24 PM.
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Old 01-26-2010, 12:23 PM   #4
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does it hum around turns?
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Old 01-26-2010, 12:34 PM   #5
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Quote:
Originally Posted by djo90 View Post
does it hum around turns?
No it doesn't. Only when I hit a certain RPM. Sort of like a harmonic spot, or something.
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Old 01-26-2010, 12:36 PM   #6
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I'm going to get under it tonight and check the flex pipe first. If that doesn't work, I'll loosen all the mounts and re-tighten again.

Anyone have an idea of which ones should be tightened first and in which sequence?
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Old 01-26-2010, 01:23 PM   #7
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There's no set pattern... I loosen the top two, rock the engine a bit and align the mounts to about where they were before, and just retighten making sure the mounts don't move. There's no need to loosen the bottom one, really... I edited my first post to reflect that.
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