Why is a high lube oil level in the main...

Question 1 / 270705eccefa1bacbc34ba4d4726c

Question 1 of 270705eccefa1bacbc34ba4d4726c

Why is a high lube oil level in the main engine reduction gear sump undesirable?

Question 1 of 27070

Why is a high lube oil level in the main engine reduction gear sump undesirable?

🔍 Key Concepts

• Reduction gear sump function and why correct lube oil level is critical • What happens when rotating gears contact too much oil (churning losses, foaming, heat) • How aerated oil affects lubrication, cooling, and bearing protection

💭 Think About

• Think about what physically happens inside the gear case if the oil level is so high that the gear teeth or wheels are deeply submerged while spinning at high speed. • Consider how this extra contact with oil would affect friction, heat generation, and whether air might get mixed into the oil. • Ask yourself if these possible effects are independent, or if one problem in the sump can easily cause the others to happen together.

✅ Before You Answer

• Visualize the gears turning in a bath that is too deep and what that does to oil movement (splashing, whipping, foaming). • Recall whether aerated (foamy) oil cools and lubricates as well as solid, non‑foamy oil. • Decide if it is realistic that only one of the listed problems would occur, or if an excessively high level would likely cause several problems at once.

Question 1 of 27070

Why is a high lube oil level in the main engine reduction gear sump undesirable?

Oil churning may result.

The oil may become aerated.

Oil temperature may rise.

All of the above.