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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Random Knocking NoiseViews : 3471 Replies : 21Users Viewing This Thread : |
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Nov 4th, 2016, 21:30 | #11 |
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Just a quick note to follow up on this topic. Spent the weekend going through all the suggested options and found the bottom cross brace that runs under the engine between the lower suspension mounts was fouling on the longitudinal beam that the lower engine mounts sit on. Hence when the engine rocked it moved the longit slightly which was enough to knock on the cross brace. Straightened the brace and hey presto no knock. I also found my anti-roll bar bushes are knackered (Thanks Gary) but hey hoo that's another job for the list!!
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Nov 8th, 2016, 15:36 | #12 | |
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2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles Click here for my x40 and V70 P3 repair guides |
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Nov 8th, 2016, 15:37 | #13 | |
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2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles Click here for my x40 and V70 P3 repair guides |
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Nov 8th, 2016, 20:46 | #14 |
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I've ordered all new bushing as while I've eliminated the knock, the engine mounts could all do with replacing. I'm hoping to replace them over the winter though I may concede on the anti-roll bar bushes having read peoples experiences of changing them. Don't get me wrong being an Engineer I love pulling things apart and rebuilding them but I do know when sometimes it's better to hand the task to someone who has the right facilities. I still lack the four poster (car lift not bed), engine hoist and forgiving wife.
Doing a bit of research I have also found out the cross brace is not on all V40s/S40s. Anybody know if this was a feature only on the sport models or did it come in later on P2 vehicles? (Runs between the rear mounts of the lower wishbones) |
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Nov 8th, 2016, 21:42 | #15 | |
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 65k miles. http://www.neptuno6benagil.com |
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Feb 12th, 2018, 11:49 | #16 | |
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Similar noise (see videos)?
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A mechanic straightened out the cross brace that hit the central beam but the noise came back after a couple of days. Any ideas about what might be causing this noise? Video of noise when stepping of gas pedal The sound changes character when I press the clutch pedal. It becomes more muffled. Video of noise when engaging the clutch The noise is present at all speeds. Here is an example while driving slowly in first gear. Video of noise at slow speed |
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Feb 12th, 2018, 20:09 | #17 |
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this is going to sound a bit weird... but have you checked the alternator? I had a similar noise for a while, despite my investigations, had to change the alternator because it died and the noise disappeared..
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Feb 12th, 2018, 22:16 | #18 |
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Sounds a bit like driveshaft to me. More specifically CV joint. Are the boots intact and not leaking any grease?
Also check the driveshaft support bearing. I would that think that very shortly the relevant component will reveal itself by a dramatic failure!
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'04 V40 1.9D |
Feb 13th, 2018, 09:08 | #19 |
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I have not noticed any noise from the alternator. If it the alternator was making the noise then the noise should probably be present at idle too, but it is not.
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Feb 13th, 2018, 09:13 | #20 |
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The outer CV joints seem alright. The boot rubber is dry and I haven't seen any cracks or grease leaks. I'll have a look at the inner joints and the driveshaft support bearing after work.
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