Hello members, I have a S40 2002 and replace the whole engine, since I replace it, the clutch main pump did not have any pressure, did any of you have an idea what could be the problem?
THank you.

 

by "main pump" do you mean the master cylinder? hydraulic clutches are just like brake systems - there's a master cylinder on the firewall with a fluid line that runs down to the bell housing and into a slave cylinder that actuates the clutch. If the line was removed as part of the engine replacement, the system needs to be bled to remove the air.