Amazon: - Exhaust knocking

Amazon122s · Mar 29th, 2011, 18:52

I am experiencing a knocking sound when I have passengers in the back seat.

I located the noise as coming from the exhaust knocking against the rear axel. I will upload a photo when I get a chance.

Has anyone experienced this and does it require new rear suspension or do i need to adjust the exhaust hangers?

Any help would be much appreciated

BenR · Mar 29th, 2011, 19:18

If the axle manages to touch the exhaust it's generally the exhaust that needs to give way!

Check the pair of hangers ahead of the axle - maybe weak or one missing? Then, assuming the exhaust is sound and not distorted due to damage/corrosion, it needs re-hanging - the joints must be loosened and the section over the rear axle jiggled to a position where it clears everything.

Alf ista · Mar 29th, 2011, 19:23

It could be something as simple as one of the rubber hangers coming loose or falling off. Have a good luck underneath and give the exhaust a shake and see what it tells you.

woodman · Mar 30th, 2011, 10:50

The figure of 8 type rubber hangers can be tightened by putting a ratchet cable tie round their middle. One of the hangers, forward of the rear axle IIRC, controls sideways movement, and in my limited experience this seems to be the source of knocking problems.

Amazon122s · Apr 11th, 2011, 09:56

Thanks for all the help. On closer inspection all of the rubber hangers are there and seem to be in good condition. I have noticed that it seems to be more of a horizontal issue than a vertical one. I don't remember hearing the noise when I bought the car. Is it possible that I have reversed into something and bent the exhaust? I would think that this would be evident from a stretching of the rubber.

Derek UK · Apr 11th, 2011, 11:45

If you can loosen the joint between the main box and the rear section, you might get more clearance by twisting the rear part a bit. There isn't much room to spare in the over axle space so you need to get it just right. Of course if you don't carry anyone in the back and/or fill the boot with heavy stuff it's not so critical.

edworcs · Apr 11th, 2011, 22:16

I agree with Derek. My exhaust was knocking and was solved by twisting/rotating the back box to a slightly different horizontal position.

Ed

Mar 29th, 2011, 18:52	#1
Amazon122s New Member Last Online: Nov 29th, 2011 15:55 Join Date: Feb 2011 Location: Kingston	Exhaust knocking I am experiencing a knocking sound when I have passengers in the back seat. I located the noise as coming from the exhaust knocking against the rear axel. I will upload a photo when I get a chance. Has anyone experienced this and does it require new rear suspension or do i need to adjust the exhaust hangers? Any help would be much appreciated

Mar 29th, 2011, 19:23	#3
Alf ista Premier Member Last Online: May 7th, 2024 10:28 Join Date: Jul 2008 Location: Co. Cork, Ireland.	It could be something as simple as one of the rubber hangers coming loose or falling off. Have a good luck underneath and give the exhaust a shake and see what it tells you. __________________ 1970 Volvo Amazon 131 with a B20A and an M40.

Mar 30th, 2011, 10:50	#4
woodman Master Member Last Online: Mar 10th, 2023 13:03 Join Date: Mar 2010 Location: Sheffield	The figure of 8 type rubber hangers can be tightened by putting a ratchet cable tie round their middle. One of the hangers, forward of the rear axle IIRC, controls sideways movement, and in my limited experience this seems to be the source of knocking problems. __________________ 1967 Volvo 121 Auto in everyday use and rolling restoration. 2002 Audi TT quattro. (Sorry!)

Mar 29th, 2011, 19:18	#2
BenR Ben Reynolds Last Online: Jan 24th, 2017 00:32 Join Date: Nov 2010 Location: Coventry	If the axle manages to touch the exhaust it's generally the exhaust that needs to give way! Check the pair of hangers ahead of the axle - maybe weak or one missing? Then, assuming the exhaust is sound and not distorted due to damage/corrosion, it needs re-hanging - the joints must be loosened and the section over the rear axle jiggled to a position where it clears everything.

Apr 11th, 2011, 09:56	#5
Amazon122s New Member Last Online: Nov 29th, 2011 15:55 Join Date: Feb 2011 Location: Kingston	Thanks for all the help. On closer inspection all of the rubber hangers are there and seem to be in good condition. I have noticed that it seems to be more of a horizontal issue than a vertical one. I don't remember hearing the noise when I bought the car. Is it possible that I have reversed into something and bent the exhaust? I would think that this would be evident from a stretching of the rubber.

Apr 11th, 2011, 11:45	#6
Derek UK VOC Member Last Online: Yesterday 21:31 Join Date: Jul 2006 Location: Chatham	If you can loosen the joint between the main box and the rear section, you might get more clearance by twisting the rear part a bit. There isn't much room to spare in the over axle space so you need to get it just right. Of course if you don't carry anyone in the back and/or fill the boot with heavy stuff it's not so critical.

Apr 11th, 2011, 22:16	#7
edworcs Member Last Online: May 8th, 2024 19:18 Join Date: Jan 2006 Location: Worcester	I agree with Derek. My exhaust was knocking and was solved by twisting/rotating the back box to a slightly different horizontal position. Ed

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