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S70 T5 Engine mounts?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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fields 100

S70 T5 Engine mounts?

Post by fields 100 » Thu Feb 02, 2012 6:28 pm

Hi, everyone,
I have a minor issue with a subdued roaring sound when I just start moving or even holding on "D" on the red light.The RPM are 840 on both "N" and "D", however when I throw it on the "N", the sound goes away.I tried, having it on "D" and holding the brakes, to raise RPM to about 1100, and that is when the noise is most evident.The best described it is a very low intensity roar and slight vibration. Exaust have been checked as well as the engine mounts, they look normal, without any cracks or sagging. Is it possible, that the rubber on them have hardened enough to transfer that noise? The mounts are original, 47K. Any ideas?
Thanks.

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jblackburn

Re: S70 T5 Engine mounts?

Post by jblackburn » Fri Feb 03, 2012 6:57 am

You SURE the front engine mount (by the crankshaft pulley) hasn't collapsed? At that age, I'm sure it probably needs replacing - that's where most vibration of that sort comes from. Stick a jack under the oil pan and jack it up slightly - you will be able to see if the rubber has separated.

My first reaction replacing that mount was
Image
ITS SO QUIET!!!
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Re: S70 T5 Engine mounts?

Post by rspi » Fri Feb 03, 2012 7:54 am

My guess is that you have a bad motor mount as well. Likely the one that Justin mentioned. Most people don't make the effort to check that mount because you have to take the wheel off and pull the skirt back. Here is a pic of a bad mount. When it's bad, the weight of the motor is in the bottom of the mount, which is rubber but it doesn't absorb the vibration like a good mount does.

Bad mount in a S70

Image

Good mount in a S70
PICT5145.JPG
Bad mount in a 850

Image

Good mount in the same 850

Image

Bottom of the mount is often rest on

Image

It vibrates more when resting on the bottom of the mount. When good it floats in the mount.
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Re: S70 T5 Engine mounts?

Post by Marcobrick » Fri Feb 03, 2012 12:04 pm

Fully endorse the above. DON'T put an aftermarket one in there either, you will regret it.
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Re: S70 T5 Engine mounts?

Post by LamboSE5 » Fri Feb 03, 2012 1:08 pm

What great pictures to illustrate that rspi. Very good to know, I learned somethin new :)

Did the OP say his S70 has only 47,000 Kms ?!

I'd say all my mounts are shot. I've yet to buy a used S/V70 that had a functional upper torque mount bushing. :lol:

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fields 100

Re: S70 T5 Engine mounts?

Post by fields 100 » Fri Feb 03, 2012 8:34 pm

Thanks, guys,I will look into it and post.
The car has 47K miles.

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Re: S70 T5 Engine mounts?

Post by rspi » Sat Feb 04, 2012 7:55 am

Age is the #1 cause of rubber failure. So you can have 20,000 miles, hit one good bump and blow a mount.
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Brucebo

Re: S70 T5 Engine mounts?

Post by Brucebo » Sat Feb 04, 2012 2:48 pm

Just bought an aftermarket mount for my 2000 S70. It didn't fit. The motor mount holes are too far to the right about 5 mm. See attached picture. Bummer as the OEM ones are ~$125.
mounts.jpg
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Re: S70 T5 Engine mounts?

Post by rspi » Sat Feb 04, 2012 8:21 pm

They have 2 different sizes. If you go to my thread, you'll see what I mean. My S70 and 850 have different sizes.
http://www.atthetipwebs.com/technologyi ... _right.htm
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Brucebo

Re: S70 T5 Engine mounts?

Post by Brucebo » Sat Feb 04, 2012 10:22 pm

Well the top (old) one came off the 2000 S70, the bottom (new) one is suppost to be for an S70, but there's enough of a missmatch that it doesn't fit in, unless perhaps I lever the motor forward a half a centimeter or so.

-B

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