Tech Tip: Squealing/Pinging Noises Coming from Volvo’s Exhaust System – UnderhoodService
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Tech Tip: Squealing/Pinging Noises Coming from Volvo’s Exhaust System

When driving through puddles of water, slush or snow, the exhaust may cool down fast enough to change shape and touch the propeller shaft, causing a high-pitched squealing noise. This noise will be noticed by the driver for only a short time; once the exhaust temperature equalizes the noise will disappear. A telltale mark will be left on the ….

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2001 and later AWD Cars (S60/V70/XC70/ S80/XC90)
When driving through puddles of water, slush or snow, the exhaust may cool down fast enough to change shape and touch the propeller shaft, causing a high-pitched squealing noise. This noise will be noticed by the driver for only a short time; once the exhaust temperature equalizes the noise will disappear. A telltale mark will be left on the propeller shaft. Should the customer experience this condition, install an exhaust support kit. (Kit for 2001 and later S60/V70/XC70/S80/ XC90 cars except S60R/V70R: P/N 30742265; Kit for S60R/V70R: P/N 30793619.)
a. Remove the existing cross-member and install the new one.
b. Tighten bolts to 25 Nm (18 ft.-lbs.).
c. Install the clamp on the exhaust pipe with the screw hand-tight.
d. Install the rubber blocks and adjust the clamp so that the rubber blocks are vertical.
e. Tighten bolts to 25 Nm (18 ft.-lbs.).

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850/S60/S70/V70/XC70/C70/S80
Exhaust clamp kits are available as a service solution for damaged or missing hangers. These kits allow a repair to be made without replacing the entire exhaust system. The kits are designed to fit directly on the pipe without any welding. Install the new clamp in place of the old hanger. Remaining pieces of the old hanger may need to be cut off before the new part can be installed.

(Note: Kits are not currently available for 1998-2000 V70 XC, 2004-S60R/V70R and XC90; Kit for 2001 and later S60/V70/XC70/S80/XC90 cars except S60R/V70R: P/N 30742265; Kit for S60R/V70R: P/N 30793619.)

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2001 and later AWD Cars (S60/V70/XC70/ S80/XC90)
A single “knock” or “ping” may be heard at engine start. In the case of a customer complaint, adjust the shields on each side of the front exhaust mount.
Press the shields on each side in toward the body by hand to increase clearance for the exhaust brace.

2001 and later S60R/V70R
The bracket underneath the exhaust can be removed at a customer’s request for increased ground clearance. This prevents the bracket from bottoming-out on uneven road surfaces. Install plates, P/N 30789011 (two required), between the bolt heads and heat shields. Use the existing bolts.

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Remove the bracket. Install the two plates. Tighten the bolts to 24 Nm (18 ft.-lbs.).

Technical service bulletin courtesy of ALLDATA.

For additional tech tips, visit www.alldata.com.

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