🔍 Key Concepts

• Roller bearing lubrication practices in marine machinery • The effect of too much vs. too little grease on bearing temperature and wear • Why a bearing needs free space for grease movement and heat dissipation

💭 Think About

• Think about what happens inside the bearing if you pack almost all the free space with grease and the rollers start spinning at operating speed. • Consider what problem you might get if there is very little grease in the bearing cavity during continuous operation. • Ask yourself: in normal practice, do we aim to completely fill a bearing, leave it almost empty, or keep a moderate amount with some free space, and why?

✅ Before You Answer

• Verify which choice leaves some empty space for grease circulation and heat expansion, instead of completely packing the bearing. • Eliminate any option that would likely cause churning of grease and overheating at operating speed. • Eliminate any option that leaves so little grease that it could quickly be displaced and fail to lubricate the rollers.