Camshaft drive chain

Rinse the chain in kerosene, and then check the condition of its links. On rollers and cheeks, chips, cracks and other damage are not allowed. When the engine is running, the chain stretches. It is considered operational if the tensioner provides tension, i.e. if the chain is extended no more than 4 mm.

Check the chain extractor on tool 67.7824.9521 (pic. 2-58), having two stepped rollers 1, on which the chain is put on. Using a counterweight 3, the chain is stretched with a force of 294 N (30 kgf) or 147 N (15 kgf). The adjusting nut 2 ensures that the axis of the counterweight is parallel to the base of the device.



Stretch the chain with a force of 294 N (30 kgf), placing the counterweight in the extreme right position, then reduce the force by 147 N (15 kgf), by moving the counterweight to the extreme left position. Repeat both operations again and determine the chain extension by the distance L (pic. 2-59) between the axes of the rollers By measuring the distance between the diameters d of the rollers with a caliper and adding the diameter d to it, you get the distance L between the axes of the rollers.



For a new chain, the distance L between the axes of the rollers is 495.3^+0,5_+0,1 mm; if the chain is extended to 499.5 mm, it should be replaced. Before installing on the engine, lubricate the chain with engine oil.