If you are wondering about whether you need a new viscous coupling, here is how to tell: 1. According to the manufacturer of the viscous couplings, the VC is only built to last 100,000kms (about 65,000 miles).he symptom that would cause you to know that your VC is too aggressive is usually that when you enter a paved parking lot and you make tight turns after a period of highway driving that the vehicle seems to want to stop as though you had put the brakes on--the vehicle simply hates tight turns.
Answer 1: oxygen and carbon in the air :-). Answer 2: Depends on what type of corrosion you are referring to. Rust and corrosion are typically used interchangeably. Rust is one type of corrosion.Corrosion is essentially the disintegration of a engineered material. Rust is a chemical reaction, but there are other chemical reactions that cause corrosion of steel (typically acids).Other types of corrosion include fretting, erosion, cavitation, and galvanic reactions. There are many methods to prevent corrosion.nswer 1: oxygen and carbon in the air :-). Answer 2: Depends on what type of corrosion you are referring to. Rust and corrosion are typically used interchangeably. Rust is one type of corrosion.
Similarly, corrosion of concrete-covered steel and iron can cause the concrete to spall, creating severe structural problems. It is one of the most common failure modes of reinforced concrete bridges.