When fuel oil has seriously contaminated a...

🔍 Key Concepts

• Purpose of lubricating oil in a diesel engine and how contamination affects bearings, pistons, and clearances • How fuel oil and lube oil differ in viscosity, additives, and function • When contamination is described as “seriously contaminated” – what that implies about the condition and safety of the oil

💭 Think About

• Think about whether you can ever fully trust lube oil again once it has been heavily diluted with fuel, even if some fuel is removed. • Consider what engine manufacturers and class societies generally recommend when critical fluids are badly contaminated: partial treatment or complete renewal? • Ask yourself which method best guarantees correct lubricating properties (viscosity, film strength) are restored quickly and safely for continued operation.

✅ Before You Answer

• Verify which options are treatment methods that try to clean and reuse the existing oil versus removal and replacement. • Consider whether filters, settlers, or centrifuges are designed primarily for normal small contamination or for oil that is already described as “seriously contaminated.” • Check which choice gives the most reliable protection to engine bearings and moving parts after major contamination.

When fuel oil has seriously contaminated a diesel engine lubricating oil, you should __________.

filter to remove the fuel oil

use the settler to remove the fuel oil

remove the fuel oil by centrifuging

drain and then renew the lube oil supply

Loading interactive features...

🔍 Key Concepts

💭 Think About

✅ Before You Answer