🔍 Key Concepts

• Purpose of a bridge gauge reading in checking reduction gear bearing clearances • How journal position (minimum or maximum clearance) affects an accurate measurement • What must be in place (or not removed) for a bridge gauge to reference the bearing correctly

💭 Think About

• Ask yourself: Do you need the bearing parts assembled or removed to measure running clearance with a bridge gauge? • Consider whether you want the journal at its loosest or tightest point in the bearing when taking a clearance reading. • Think about which option (A, B, C, or D) would actually allow you to compare your measurements to the manufacturer’s specified clearances.

✅ Before You Answer

• Verify how a bridge gauge is physically set up across a bearing cap and what surfaces it references. • Check which bearing components must remain installed for the gauge to have a meaningful reference surface. • Confirm whether minimum oil clearance or maximum wear position is the conventional condition for recording clearance readings per standard marine practice.