I recently had the valves replaced on my Curtis compressor (model no. 308 26). The original bolts were lost but I purchased new hardened steel bolts and copper washers. I had no torque specs so I only hand tightened. Once I started the unit it began to leak around the base of the valves and around the bolt heads. Any suggestions on what the problem could be. Also, I notice the unit loads to 160 pounds and will not shut off. Is this too high or is this normal