Light scoring is identified as rough, partially porous lines or areas aligned in the direction of
sliding. When the film of lubricant is torn away between the flanks, this permits direct
metal-to-metal contact causing seizure or welding. These welded zones are immediately torn
apart again, producing the damage associated with scoring. Scoring initially occurs in areas
subjected to high hertz frequency stresses and high sliding speeds, usually along the tooth
root and tooth tip. Light scoring only covers a part of the entire surface of the flank or is not
strongly developed and has caused only insignificant wear after smoothing.
18. If light scoring is present, replace the affected parts.
Light scoring is caused by the following conditions:
Inadequate oil viscosity
Unfavorable gear geometry
Temporary lack of lubricant
Surface roughness
Faulty heat treatment of the gears
2007 Hummer H3
2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3