Checking the technical condition of the timing drive

Remove the top cover.

Check the timing belt (A) for damage, oil or coolant ingress

Installing cylinder heads, valve rocker arms and adjusting valve clearances

The cylinder head mounting studs are screwed into the right and left rows of the cylinder block, having previously lubricated the threaded holes for the studs in the block with diesel oil

The clutch of the YaMZ-238 model is double-disc, dry, friction type, with a peripheral arrangement of cylindrical springs

The fuel level in the float chamber is adjusted with the carburetor cover removed.

The gas distribution mechanism controls the timely intake of air charge into the cylinders and the removal of exhaust gases from them; consists of valves with springs, a camshaft with gears and parts that transmit movement from the shaft to the valves

The cylinder heads are separate for each cylinder, made of aluminum alloy. They have water cavities communicating with the same cavities of the cylinder block, inlet and outlet channels, plug-in seats and valve guides.

The engine consists of a crank and gas distribution mechanisms, as well as cooling, lubrication, power and control systems, and starting

Carburetor K-151V (Fig. 1) - vertical, emulsion, two-chamber, with a falling mixture flow and sequential opening of the throttle valves

The ignition system - battery-operated, contactless - consists of an ignition coil, a switch, an ignition distributor sensor, spark plugs, spark plug tips, low and high voltage wires. The ignition system diagram is shown in the car electrical equipment diagram

Let's consider the malfunctions that may occur during engine operation:

  • - The crankshaft is not turned by the starter;

The GA3-66 vehicle is a two-axle truck, with a payload capacity of 2 tons, all-terrain, with drive on both axles. It is designed to replace the same type of GAZ-63 car produced by the plant

To assemble the engine, as well as to disassemble it, the engine cylinder block assembled with the clutch housing is fixed on a stand (see Fig. 1)

Before assembly, all engine parts are selected according to size, thoroughly washed, blown with compressed air and wiped with clean napkins

  • - it is not necessary to remove the engine to remove the cylinder head
  • - to prevent damage to the paintwork of the wings of the body, it is necessary to use a special coating
  • - to prevent damage to the cylinder head, before removing it, you must wait until the engine cools down

Cylinder block

Checking and adjusting the valve clearance must be done on a cold engine (coolant temperature 20˚С), with the cylinder head mounted on the block

Checking the technical condition of timing parts

Sprockets, hydraulic tensioner, chain guide and tensioner arm

By default, we already have the cylinder head removed

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