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Turbo Compressor Bypass Valve Replacement
 
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Pelican Technical Article:

Turbo Compressor Bypass Valve Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$60

Talent:

***

Tools:

5mm hex driver

Applicable Models:

Volvo C30 (2007-13)

Parts Required:

Turbo Compressor Bypass Valve

Hot Tip:

Make sure the diaphragm is seated correctly in the turbo housing

Performance Gain:

Prevents damage to the turbo

Complementary Modification:

Replace turbo control valve

The compressor bypass valve (CBV) is used to re-direct the boost pressure surge from the turbo back into the intake when the throttle is closed. This prevents wear on the turbo assembly and keeps the system working properly. It is common for the bypass valve to wear out or rupture over time, especially if you have modified the turbo system for increased boost.

In this article I'll go over the steps involved with replacing the valve. Keep in mind that this article can also be used if you are installing a block-off plate in place of the valve. This is a typical modification if you are upgrading the system and would like to mount the valve elsewhere in the system.

The valve itself is accessed through the right side front wheel well. The right side of the engine bay is derived from sitting in the car. The driver's seat is on the left side of the vehicle in a North American car.

You'll need to jack up the front of the car and remove the front right wheel liner for access. You will also need to move the turbo control valve out of the way. See our articles on Jacking up Your C30, Removing Front Wheel Liners and Turbo Control Valve Replacement for more information.

Shown here is the location of the CBV (green arrow), directly behind the turbo control valve (yellow arrow).
Figure 1

Shown here is the location of the CBV (green arrow), directly behind the turbo control valve (yellow arrow). You'll need to pull the turbo control valve up and off the mounting bracket to access the CBV behind it.

This picture shows the CBV with the turbo assembly removed from the engine.
Figure 2

This picture shows the CBV with the turbo assembly removed from the engine. This makes the repair procedure much clearer as it is very difficult to photograph while installed. Pull the vacuum line (yellow arrow) off the CBV and set it aside. Then loosen and remove the three 5mm hex screws (green arrows) holding the CBV to the compressor housing. 

Carefully pull the bracket and CBV cover off.
Figure 3

Carefully pull the bracket and CBV cover off. Keep in mind that there is a large spring (green arrow) behind the cover that can fly off if you're not careful. Pull the CBV diaphragm (yellow arrow) out of the compressor housing. 

Inspect the diaphragm (green arrow) for tears or damage.
Figure 4

Inspect the diaphragm (green arrow) for tears or damage. If it is damaged, replace it. When installing the new diaphragm, make sure that the spring (yellow arrow) is seated correctly. Now re-install the 5mm hex screws, CBV cover, retaining bracket and vacuum line.

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