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Engine and Transmission Mount Replacement
 
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Pelican Technical Article:

Engine and Transmission Mount Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$50 to $200

Talent:

****

Tools:

Floor jack, 8mm/10mm/13mm/15mm/17mm/18mm sockets

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

Engine mounts

Hot Tip:

Use a floor jack to support the drivetrain.

Performance Gain:

Smoother feel when driving

Complementary Modification:

Replace battery

The entire drivetrain of the Volvo C30 is held to the car by three rubber-isolated mounts. Two are located on either side of the engine bay and the remaining mount secures the mount below. Over time, the rubber bushings inside the mounts break down and tear, resulting in increased movement and drivetrain vibration.

Replacing the engine mounts isn't terribly difficult, although it does require you to support the engine/transmission with a floor jack when replacing the actual mounts. Be sure to only replace the mounts one at a time. You'll also need to remove the battery and battery box (right side of engine bay) and also the coolant expansion tank (left side of engine bay. See our articles on Battery Box Removal and Coolant Expansion Tank Replacement for more information.

Place a floor jack with a block of wood or cardboard under the oil pan as shown here.
Figure 1

Place a floor jack with a block of wood or cardboard under the oil pan as shown here. This will hold the engine up in place while you detach the mount. The lower engine mount does not need to have the jack in place.

Loosen and remove the two 17mm bolts (green arrows) holding the cross brace and mount to the chassis.
Figure 2

Loosen and remove the two 17mm bolts (green arrows) holding the cross brace and mount to the chassis. Remove the cross brace form the engine bay.

Loosen and remove the two 17mm bolts (green arrows) and maneuver the mount out of the engine bay.
Figure 3

Loosen and remove the two 17mm bolts (green arrows) and maneuver the mount out of the engine bay. You may need to use a breaker bar to get the bolts loose.

Shown here is the transmission mount on the right side of the engine bay.
Figure 4

Shown here is the transmission mount on the right side of the engine bay. Be sure you have the transmission firmly supported before anything else. Now loosen and remove the 15mm bolt (yellow arrow) holding the mount to the transmission and also the four 18mm nuts (green arrows) holding the mount and upper bracket to the chassis. Don't forget to remove the two 10mm bolts (purple arrows) and the small 8mm bolt (red arrow) holding the bracket to the mount. Once the bolts are removed, lift the bracket up and out of the engine bay.

Now lift the mount assembly (green arrow) out of the engine bay.
Figure 5

Now lift the mount assembly (green arrow) out of the engine bay.

Shown here is the transmission without the mount attached.
Figure 6

Shown here is the transmission without the mount attached. You can see how the whole assembly is held on with just one bolt (green arrow).

Seen here is a tell-tale example of a mount about to fail.
Figure 7

Seen here is a tell-tale example of a mount about to fail. You can see the crack (green arrow) that has just started to form inside.

Here is the lower engine mount on the Volvo C30.
Figure 8

Here is the lower engine mount on the Volvo C30. Loosen and remove the 15mm nut and bolt (green arrows) holding the mount to the subframe. Next loosen and remove the 10mm nut (yellow arrow) holding the bracket to the nut. The last step is to loosen and remove the three 13mm bolts (purple arrows) holding the mount to the transmission. Installing the new mounts is the reverse order of disassembly.

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