Mercruiser 4 Cyl. I/O Model 1 (pre 1983) rams rebuilt 3 months ago with new shells, piston, o-rings,inner tube, and NEW caps. Installed and worked fine(about 12 up & downs). Sat up out of water for 3 months with no use waiting for lower unit repairs. Today, installed lower unit and tried to lower OD, moved down real slow, went up ok for 1 or 2 seconds then POW, new end cap blew apart. The oil lines are NOT crossed, tho OD was only 1/2 way to full up position, and OD moves freely with rams disconnected. Took ram apart and put old cap back on. Guess what? Same thing happened exactly, OLD ram cap blew apart on way up to 1/2 up position. <br /><br />Any suggestions as to cause and repairs to fix this problem. I only have one more cap and don't want to blow it apart like the others.<br /><br />Thanks for any help!<br />PS I'll post a picture if someone tells me how.