2.8.5. Piston replacement with a rod

NOTE If one of these two elements has to be replaced, it is necessary to replace all knots of the block (the piston, piston rings, a piston finger and a rod) new.

Collect directing bolt using the special KM-634-6 (1), KM-634-7 (2) and KM-634-5 (3) tools.

Establish the new piston in KM-634-1 (1) nest.

NOTE The opening of a piston finger should settle down horizontally.

Establish KM-634-4 (3) on KM-634-1.

Tighten bolts by hand.

Reliably fix the piston, using KM-634-2 (2) that it could not be displaced.

Define depth of a press fitting of a piston finger.

Press a hub (1) consisting of KM-634-6, KM-634-7 and KM-634-5 in an opening of a piston finger and a rod before achievement of KM-634-7 of the central situation in the piston.

In this situation KM-634-4 (2) should be opposite to edge of knot (arrow).

Tighten KM-634-4 bolts.

Remove KM-634-7 from a directing bolt and replace with the new (oiled) piston finger.

Heat up a new rod in the top part a heating plate.

Put the top head of a rod on a heating plate.

Reduce heat losses by means of a fire-resistant brick.

Installation temperature: from 280 °C to 320 °C

ATTENTION Repeated machining of a rod is impossible, because it has no balancing hairpins. Observe the correct arrangement of the adaptation. Inflow on a rod should be opposite to an arrow on the piston bottom.

Establish the piston bottom on the piston with a rod.

NOTE The got stuck piston cannot be pressed – carry out installation quickly.

Press the knot consisting of KM-634-6, a piston finger and KM-634-5 smoothly and without a delay through an opening of a piston finger and an emphasis rod in KM-634-4.

Disconnect KM-634-5 and KM-634-6 from the right and left parties of a piston finger.