Lincoln AG9Z-6108-L Piston

Before disassembling the piston and connecting rod assemblies, therefore, other parts such as the cylinder head and the oil pan have to be detached. Feel with your fingernail if there is ridge at the top of the ring travel indication which if present must be machined off using special tool since failure to do so would cause the piston to break. When you have eliminated the ridges, rotate the engine in a manner that the crankshaft is upright position and then, you will continue to remove the balance shaft assembly of four cylinder engines. Feel with feeler gauges the connecting rod end play before releasing main bearing caps or connecting rods and make sure it is within the prescribed limit. The connecting rods and caps shall be marked and the connecting rod cap bolts loosened and removed to remove the number one connecting rod cap and the bearing insert without dropping the insert. Extrude the connecting rod/piston assembly out through the top of the engine with the caution of making sure all the materials on the ridge are clear. Do the same for rest of cylinders; reattach the connecting rods' caps and bearing inserts in their correct places and safeguard the old bearing inserts during the process. The pistons as well as the connecting rods can now be inspected, and having been lubricated last time, may now need some detailing. Always check the ring end gaps before fitting new piston rings in the cylinder as well as check the piston ring side clearance. Spread the piston-connecting rod assemblies and new rings on bench so that they can easily be paired during the assembly process. Place the top ring to the first cylinder and using the feeler gauges, ensure the end gap is correct and adjust if it is not. The oil control ring must be positioned and fitted well before the middle and the top rings are positioned in the right orientation. Cylinder walls should also be free from rust and debris, edges of the cylinder and the crankshaft should also be chamfered before installation. Screw off and lightly clean the bearing surfaces then place new upper and lower bearing inserts without applying any lubricant. Align the gap of the piston ring at the 0-degree, 90-degree, 180-degrees, and 270-degree, lubricate the piston rings, and use the piston ring compressor for the compression of the rings. Measure the oil clearance of connecting rod bearing using Plastigage, after make sure that the surface is free from any oil. If the clearance is not as specified check the bearing sizes and the journal diameter. After checking, spread the same layer of grease on faces of the bearing, put the rod cap and new bolts and tighten them to the prescribed revolutions. This is done so for the remaining assemblies while paying attention to cleanliness and the orientation of other assemblies. Following installation again turn the crankshaft to see if it binds anywhere and at the same time check the end play at the connecting rod to the crank journal. Last of all, add extra components applicable to a given model of an engine if required.

Before one could begin removing the piston and connecting rod assemblies, one requires the head of the cylinder and the oil pan. You should run your finger nail from down the bore and feel whether there is any ridge at the top dead center of the rings when they are at the maximum top ring travel in each cylinder; the ridges must be scraped out with a special tool to leave the cylinder bore smooth as per the manufacturer's recommendations in order not to cause breakages to the piston. Next, align the engine with the crankshaft in an upward manner and, on four-cylinder engines, also, pull out the balance shaft assembly; on the two vehicles with 3.5L engines, you should also take out the main bearing cap support brace. Before taking off the main bearing caps or destroying the connecting rods, check the CON ROD END PLAY with the help of the feeler gauges and it should be always lie within the stipulated limit. If the connecting rods or caps are not marked clearly, then paint or draw a mark around the connecting rods and caps then use a slowly rotating bolt to loosen the connecting rod cap bolts to the point where they can be removed by directly. Lift the first connecting rod cap and its bearing insert off gently; the connecting rod/s piston will then be pushed out of the top of the engine whose ridges must be smoothed. Do the same for the rest of the cylinders; after removal, secure the connecting rod caps and new bearings in their allocated rods keeping the old bearings in to preserve the bearing services. The pistons and cranks or connecting rods are now receptive of inspection and renewal. This step should be performed prior to fitting new pistons rings, the ring end gaps should be examined and the piston ring side clearance should be correct. Piston and connecting rod sets and new rings should be arranged for pairing up. Slide the first intermediate ring into the first cylinder and align it with the walls of the cylinder; check the thickness of the end gap with the feeler gauges and adjust it if necessary. The oil control ring should be placed on first then the mid and finally the top ring in the right position. Before installation, properly degrease the cylinder walls and edge blending and make certain that the crankshaft fits. Remove and clean the bearing housing surfaces to bear on; replace upper and lower bearing inserts with no lubricant applied. Space the gap of the piston ring 90 degrees apart, apply oil to the piston and rings and then use a piston ring compressor while 'installing'. Verify the connecting rod bearing oil clearance using Plastilge as used in determining the right size and condition of the bearing inserts. After making sure of the clearance, it is good to lubricate the bearing faces via grease or engine assembly lube, fit the rod cap with the new bolts and tighten to the degree of torque mentioned. Repeat the same with the other assemblies but make sure that they are also clean and well oriented. Following installation, spin the crankshaft to detect binding and measure/in Adjust connecting rod end-shaft clearance where new stock has been installed.

Before disassembling the piston and connecting rod assemblies, therefore, other parts such as the cylinder head and the oil pan have to be detached. Feel with your fingernail if there is ridge at the top of the ring travel indication which if present must be machined off using special tool since failure to do so would cause the piston to break. When you have eliminated the ridges, rotate the engine in a manner that the crankshaft is upright position and then, you will continue to remove the balance shaft assembly of four cylinder engines. Feel with feeler gauges the connecting rod end play before releasing main bearing caps or connecting rods and make sure it is within the prescribed limit. The connecting rods and caps shall be marked and the connecting rod cap bolts loosened and removed to remove the number one connecting rod cap and the bearing insert without dropping the insert. Extrude the connecting rod/piston assembly out through the top of the engine with the caution of making sure all the materials on the ridge are clear. Do the same for rest of cylinders; reattach the connecting rods' caps and bearing inserts in their correct places and safeguard the old bearing inserts during the process. The pistons as well as the connecting rods can now be inspected, and having been lubricated last time, may now need some detailing. Always check the ring end gaps before fitting new piston rings in the cylinder as well as check the piston ring side clearance. Spread the piston-connecting rod assemblies and new rings on bench so that they can easily be paired during the assembly process. Place the top ring to the first cylinder and using the feeler gauges, ensure the end gap is correct and adjust if it is not. The oil control ring must be positioned and fitted well before the middle and the top rings are positioned in the right orientation. Cylinder walls should also be free from rust and debris, edges of the cylinder and the crankshaft should also be chamfered before installation. Screw off and lightly clean the bearing surfaces then place new upper and lower bearing inserts without applying any lubricant. Align the gap of the piston ring at the 0-degree, 90-degree, 180-degrees, and 270-degree, lubricate the piston rings, and use the piston ring compressor for the compression of the rings. Measure the oil clearance of connecting rod bearing using Plastigage, after make sure that the surface is free from any oil. If the clearance is not as specified check the bearing sizes and the journal diameter. After checking, spread the same layer of grease on faces of the bearing, put the rod cap and new bolts and tighten them to the prescribed revolutions. This is done so for the remaining assemblies while paying attention to cleanliness and the orientation of other assemblies. Following installation again turn the crankshaft to see if it binds anywhere and at the same time check the end play at the connecting rod to the crank journal. Last of all, add extra components applicable to a given model of an engine if required.

The ring end gaps must be checked, assuming the piston ring side clearance has been verified correct.