Disassembling pistons and connecting rods (Mondeo 2)

The pistons are equipped with two compression rings and one oil scraper ring. The piston and piston pin form one unit and can only be replaced as a set. Piston pins and piston pin holes are divided into classes by diameter and have color markings. If, when measuring the cylinder bore diameter, it is determined that the cylinder must be bored by more than 0.5 mm, then all other cylinders must also be bored to this size.

Since piston pins can only be installed with a special tool, evaluate your capabilities before separating the pistons from the connecting rods. If you can do the job yourself, proceed as follows:



Fig. 75. Pressing out the piston pin

- press out the piston pin using a mandrel and a press. To do this, place, for example, a piece of U-shaped profile under the piston, as shown in Fig. 75;



Fig. 76. Removing or installing piston rings with pliers

- remove the piston rings from the pistons using piston ring pliers, as shown in Fig. 76. If you do not have such pliers, you can carefully lift the ring out of the groove using a steel strip and, by running it around it, remove the ring from the engagement. It is necessary to take into account that piston rings break easily.

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