This belt tension pressure spring covers part numbers 51976010314, 20680, 4057795203310 and 51958050053. It fits perfectly on engine units of MAN TGA, TGX and TGS trucks. It keeps steady tension on the engine drive belt, which effectively avoids belt slippage and unwanted running noise. Crafted from premium spring steel material, it retains stable elasticity and great fatigue resistance during prolonged operation. Built to meet standard OEM specifications, it features precise dimensions for easy direct fitting. It works well for routine engine servicing and replacement of worn tension components