The GRM belt is a rubber belt with notches from the inside which connects the crankshaft and a cam-shaft of the engine. The crankshaft rotates at the expense of pistons through binding belts. It occurs by the same principle, as rotation of a gear wheel of the bicycle. The cam-shaft has to open valves in the top point of a movement of the piston therefore it is necessary to synchronize rotations of distributive and cranked shaft. To this purpose serves a GRM belt. Posredstvam of teeth he gives pulleys of both shaft and regulates their rotation. Japanese usually with an amazing accuracy specify the term of replacement of a GRM belt. The threshold is usually given to 100.000 km. run (so recommend to do for Toyota), but on each car differently. Sometimes the GRM belt "clings" some more units besides a cam-shaft and the crankshaft that reduces its service life.
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Belt of the gas-distributing mechanism
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