Pull the check valve out by rotating it to remove it from the rubber sealing washer.
Note. Be careful not to damage the suction pipe on the intake manifold. If it breaks, the intake manifold must be replaced.
Disconnect the suction hose (2) from the intake manifold.
Check the condition of the rubber sealing washer and check valve.
Replace defective parts. Installation is made in an order, the return to removal.