Bypass Valve Maintenance
It is recommended that every time you change your oil you inspect your COBB Tuning Bypass Valve to make sure the piston is still moving freely. You can do so by unbolting the BPV from the vehicle mounting flange and pushing on the piston. If you can feel some resistance, it is advised to remove the piston from the body and clean and re-grease the piston, we recommend ARP Ultra-Torque Fastener Assembly Lubricant, P/N 100-9911 or Super-Lube Silicone Grease with PTFE, but any moly-based grease will work fine.
Disassemble the COBB Tuning Bypass Valve
In order to remove the piston, unbolt the base flange from the body using a 3mm allen key. Depending on the BPV model you have, this may be 5-7 socket head cap screws. When removing the piston, be careful to not cut the o-ring. If your o-ring is damaged, you can contact COBB Tuning for a replacement.