Installing fresh wet cylinder liners during an engine overhaul or block rebuild on a Caterpillar 3406 or C-15 engine? Follow this step-by-step professional workshop procedure to prepare the block counterbores, lubricate lower o-ring seals, mount the M20104-B liner press, draw the liner down smoothly, and measure exact protrusion. Why Improvised Hammering Methods Cause Fatal Head Gasket Blowouts On Caterpillar 3406 and C15 engines, proper cylinder liner installation requires strict adherence to OEM protrusion specifications. The cylinder liner flange must sit dead-level on the block counterbore ledge to maintain uniform clamping force under the cylinder head gasket. Technicians who attempt to drive liners in using mallets or block drivers introduce massive service hazards. Hammering impact drives the liner down at an angle, crushing and twisting the elastomeric lower coolant o-rings against the lower bore entrance. Damaged lower seals allow coolant to bypass directly into the engine oil pan. Furthermore, uneven impact force distorts the upper liner flange, creating uneven protrusion heights around the cylinder circumference. When the cylinder head is torqued down, localized stress gaps allow high-pressure combustion gases to burn past the head gasket fire ring, resulting in blown head gaskets, overheating, and cracked cylinder heads. Utilizing the 12-pound M20104-B Liner Press eliminates these installation failures entirely. Anchored directly to the engine deck block threads, the tool distributes smooth, 360-degree parallel mechanical pressure, pressing the liner squarely into the bore until the flange seats 100% flat against the counterbore shoulder stop. The 5-Step CAT 3406/C15 Cylinder Liner Installation Protocol Clean & Inspect Engine Block Deck & Counterbores: Thoroughly clean the engine block deck, counterbore ledges, and lower seal bores using solvent and fine Scotch-Brite. *Verify counterbore ledges are 100% clean, flat, and free of rust scale or old carbon deposits.* Install & Lubricate Lower Coolant O-Rings: Install fresh lower o-rings and crease seals onto the cylinder liner grooves per Caterpillar manual specs. Apply approved o-ring lubricant (such as CAT rubber lubricant) liberally to the seals and lower block bore chamfer. Position Cylinder Liner & Mount M20104-B Press: Carefully lower the cylinder liner into the engine block bore until the lower o-rings make contact with the entrance chamfer. Place the M20104-B press plate squarely over the top liner flange and anchor the tool studs into adjacent head bolt threads. Press Liner to Counterbore Seat: Apply clean engine oil to the central forcing arbor threads. Turn the forcing nut clockwise using a manual socket wrench to press the liner down smoothly until the liner flange bottoms firmly against the block counterbore seat. Remove Tool & Verify Protrusion Measurement: Unbolt and remove the M20104-B press assembly. Using a dial indicator gauge and holding hold-down bolts, measure liner protrusion at four 90-degree points around the flange face to confirm it meets strict Caterpillar OEM tolerances. PRO-TECH O-RING LUBRICATION & MANUAL WRENCH MANDATE: ALWAYS USE APPROVED RUBBER O-RING LUBRICANT to prevent seal roll or tearing during insertion! NEVER use petroleum grease, which degrades elastomeric seal rings! ALWAYS advance forcing screws using MANUAL HAND TOOLS; never use pneumatic impact wrenches, which can crack top liner flanges! 12 lbs Heavy-Duty Structural Tool Steel Press Assembly. Protect CAT 3406/C15 Overhauls. Get the M20104-B Liner Press Now