Lubricants, Fluids, Filtration And Contamination

Question 1

What does lubrication mean?

Answer 1

• provides a low friction barrier between moving components

Question 2

What does cooling mean?

Answer 2

• helps carry heat away from internal components e.g piston cooling jets

Question 3

What does cleaning mean?

Answer 3

• helps carry away contaminates from combustion (carbon/soot) and internal wear (bearings)

Question 4

What are the common clearance between bearings and journals?

Answer 4

• approx 0.001” per 1” diameter journal
• metric 0.0245mm per 25mm

Question 5

How does engine oil differ from other oil such as hydraulic oil?

Answer 5

• usually have more detergents and stabilises to help clean the ending and deal with higher temps

Question 6

What additives are found in engine oil?

Answer 6

• detergents,
• anti forming agents - stop air bubbles
• anti fungal
• viscosity stabilisers/ modifiers
• anti freeze agents ( coolant, oil and fuel)
• anti boil agents
• corrosion inhibitors
• anti waxing agents (diesel)
• anti coagulants