Removing the electronic control unit (ECU)

Disconnect intermediate harness (1) (650.3724014), engine sensor harness (2) (650.3724012) and injector harness (3) (650.3724010) from the electronic control unit.

Remove the mounting brackets for the engine sensor harness and injector harness by unscrewing the screws (7), and remove the clamp of the intermediate harness by unscrewing the nut (9).

Remove the fuel pump pipe (4) (650.1104416).

Removing the electronic control unit (ECU) YaMZ-650

Remove the computer (5) (650.3763010) by unscrewing the nuts (6).

Remove the ECU spacer (8) (650.37631 06) by unscrewing the three screws securing it.

Removing engine harnesses

Disconnect the sensor harness from the oil pressure sensor and crankshaft speed sensor.

Remove the clamps for fastening the harnesses.

Remove the injector harness (650.3724010), engine sensor harness (650.3724012) and intermediate harness (650.3724014).

Installing engine harnesses

Installing the injector harness in the YaMZ-650 cylinder head

Lay the injector harness over the engine.

Install the L-shaped adapter into the head hole.

Insert the L-adapter fastening bolt and finally tighten to Mcr = 20 ± 4 Nm.

Connect the injector harness to the injectors.

Screw on the nuts securing the wires to the injectors and finally tighten them to a torque of Mcr = 1.5 ± 0.25 Nm. (Fix the wires in such a way that the wires from the injectors go in the direction opposite to the passage of the axis of the rocker arms) (see Fig. 2).

Lay the sensor harness over the engine.

Installing the YaMZ-650 engine sensor harness

Fix the harness at point (1) (see Fig. 3) by placing a clamp between the harness branch tee and the branch tee to the rail pressure sensor.

Then sequentially fasten the tourniquet at points (2, 3, 4) (see Fig. 123).

Tighten the clamp mounting bolts to a torque of Mcr = 20 ± 4 Nm.

Lay the intermediate harness over the engine.

Installing the YaMZ-650 intermediate harness

Fix the harness at point (5) (see Fig. 4) by placing a clamp between the branch tee on the water-in-fuel level sensor and the branch tee on the fuel filter heating relay.

Fix the tourniquet at point (6) (see Fig. 4) by setting the clamp.

Tighten the clamp mounting bolts to a torque of Mcr = 20 ± 4 Nm.

Installation of the electronic control unit

Install the ECU spacer on the block, screw in the mounting bolts (1) M8x1.25-20 and (2) M8x1 25-25, tighten with a torque of Mcr = 20 ± 4 Nm (see Fig. 5).

Installing the spacer of the YaMZ-650 electronic control unit

Install the bracket fixing screw and tighten to Mcr = 7.5 ± 1.5 Nm.

Install the electronic control unit assembly on the spacer studs, screw on the fastening nuts and tighten with a torque of Mcr = 10 ± 2 Nm.

Install the angled connectors of the wiring harnesses into the connectors of the electronic control unit (do not touch the connector pins).

Fix the wiring harnesses on the brackets with the help of clamps, screw the nuts of their fastening onto the bracket studs and tighten with a torque of Mcr = 7.5 ± 1.5 Nm.

Install the fuel priming pump tube.

Tighten the union nuts with a torque Mcr = 28 ± 2 Nm.

Connect the sensor harness to the engine sensors.

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