2001 Mercury Mariner 50-60HP Factory Service Manual, Page 348Get this manual
POWER TRIM
Memory Piston Removal
1Remove memory piston from cylinder using one of two methods: aUsing lock ring pliers (PN 91-822778A3) or suitable tool
bBlowing compressed air into manual release valve hole using air nozzle
WARNING
Memory piston cup may be expelled at high velocity when air pressure is appliedFailure to place cylinder as shown below could result in personal injury