Single ram power tilt/trim cylinder o-ring repair kit for all Mercury V6 2-strokes with the long trim rams run on stock and offshore (ROS) high-performance outboards. 
 
Part Number
79879A1
 
Includes one (1)  Single Ram Power Trim Cylinder Repair Kit.
 
Contact Mike Hill at mike@buckshotracing77.com with any questions.
 
Here's a set of instructions for rebuilding the single ram power tilt/trim cylinder with the O-ring repair kit (Part Number 79879A1) for Mercury V6 2-strokes, including long trim rams for stock and offshore high-performance outboards:
 
Tools and Materials Needed:
 
O-ring repair kit (Part Number 79879A1)
Pin Spanner Wrench
Basic hand tools (socket wrenches, screwdrivers)
Torque wrench
SAE 10W/30 or 10W/40 motor oil for lubrication
Loctite 271 (thread locker)
Clean, lint-free work area
 
Disassembly Instructions:
 
Preparation:
Ensure you are working in a clean, lint-free area to prevent contamination.
Disconnect the hydraulic lines from the power trim cylinder and remove the trim cylinder from the outboard.
 
Trim Cylinder Disassembly:
Secure the trim cylinder in a vice, ensuring that it is protected with soft jaws or a cloth.
Use a spanner wrench or a suitable tool to remove the rod guide and pull the trim rod assembly out of the cylinder.
 
Remove Internal Components:
Extract the rod guide, O-rings, scraper, plain washer, and retaining ring (refer to Figure 2).
Carefully disassemble the shock piston, floating piston, compression springs, and other internal components as shown in Figure 3.
Discard any old O-rings and damaged parts.
 
Reassembly Instructions:
 
Prepare Components:
Clean all parts thoroughly and inspect them for damage. Replace any worn components as needed.
Before assembly, lubricate all internal parts with SAE 10W/30 or 10W/40 motor oil.
 
Install O-Rings on Rod Guide:
Place 3 new O-rings (supplied in the kit) on the rod guide.
Install the new scraper, plain washer, and retaining ring onto the rod guide.
 
Reassemble Shock Piston:
Install the check balls, compression springs, spring seats, and spring guides onto the shock piston.
Place 2 new O-rings on the shock piston and insert the large washer on the end of the trim rod.
Apply Loctite 271 to the piston rod bolt threads and fasten it to the piston rod. Torque to 58-72 ft. lbs. (8.02-9.95 kg.m).
 
Insert Pistons into Cylinder:
Install the new O-ring on the floating piston and insert it into the cylinder (blunt end first).
Insert the trim rod assembly into the cylinder and thread the rod guide securely in place.
 
Final Assembly:
Reattach the hydraulic lines and ensure all connections are tight.
Test the power tilt/trim system for proper operation and check for leaks.
 
Important Note:
 
Ensure the area remains clean throughout the process to prevent contamination that can lead to system failure.
 
These instructions will help guide you through the process of rebuilding the power tilt/trim cylinder for your Mercury V6 outboard, ensuring reliable and effective performance.