Note. Before proceeding with the removal of the connecting rod and piston assemblies from the engine, it is necessary to remove the cylinder heads, the oil pan and the oil pickup tube (see part SOHC engines or DOHC engines this chapter).
1. Completely remove stepped wear from the top of the cylinders using a special countersink - proceed in accordance with the manufacturer's instructions attached to the countersink. The step is formed at the boundary of the piston stroke, approximately 6.4 mm below the upper cut of the cylinder due to mechanical metal working and carbon formation, its presence can be determined by touch with a fingernail. Attempts to extract the connecting rod and piston groups without removing the stepped wear are fraught with damage to the pistons.
2. Having finished preparing the cylinders, turn the engine upside down so that the crankshaft is on top.
3. Before removing the connecting rods from the crankshaft, evaluate the amount of axial play of their fit on the necks of the latter. Firmly insert the blade (I) measuring probe into the gap between the side wall of the lower head of the connecting rod and the cheek of the crank, completely selecting the play of the connecting rod on the shaft neck. The total thickness of the selected probe blades will be equal to the value of the axial play of the connecting rod. Compare the result of the measurement with the requirements of the Specifications. If the value of the axial play exceeds the maximum allowable value, this connecting rod must be replaced. The axial play of a new connecting rod, or an old one on a new shaft, may be less than the lower permissible limit, in which case the connecting rod can be machined - consult with car service specialists. Check all remaining connecting rods one by one.
4. Make sure that the lower heads of the connecting rods and their covers have identification marks belonging to your cylinder, if necessary, mark yourself with a small center punch.
5. In several steps (1/2 turn per approach) Loosen the connecting rod cap nuts just enough to allow them to be unscrewed by hand. Remove the cover of the first connecting rod together with the bearing shell placed in it, try not to drop the last one.
6. To protect the neck of the shaft and the mirror of the cylinder, pull a couple of pieces of a suitable hose on the bolts of the lower head of the connecting rod.
7. Remove the bearing shell from the connecting rod head, then, resting the wooden handle of the hammer against the bearing bed in the lower head, push the connecting rod and piston assembly out of the block through the top of the cylinder. If resistance occurs, immediately stop removing the assembly and make sure that the stepped wear on the top of the cylinder is completely removed.
8. Acting in a similar manner, remove the remaining connecting rod and piston assemblies from the engine.
Note. The connecting rod to be removed is installed coaxially with its cylinder by turning the crankshaft accordingly - proceed with extraction only after the connecting rod is located strictly parallel to the cylinder axis!
9. To avoid accidental mechanical damage to the bearings and loss of components, reinstall the bearing shells and secure the bearing caps to the bottom heads of your connecting rods by hand-tightening the nuts.
10. Do not remove pistons from connecting rods (see Section Checking the condition of the components of the connecting rod and piston group).