Bearing damage (Renault 19)

Knocking in the engine, which intensifies as the engine heats up, and therefore as the oil liquefies, almost always indicates bearing damage. Bearing damage can be caused by:

• Insufficient lubrication due to too low oil level.
• Water entering the engine oil due to damage to the cylinder head gasket.
• Running a cold engine at too high a speed and therefore with very viscous oil.
• Damage to the oil film due to strong heating of the oil, due to incorrect selection of oil viscosity.

[Article reprinted from the website: renaultbook]