Class 2 (2nd Engineer) MEKG 📅 Nov 2023

Exam Question

With reference to main propulsion shaft systems:

(a) Describe a method of hydraulic jacking to check bearing loads. (8)

(b) Sketch the Bearing Load versus Shift Lift Dial Gauge Reading graph obtained by the method described in part (a), annotating the graph and how the characteristic of bearing load is obtained. (8)

Reference Answer

### (a) Method of Hydraulic Jacking to Check Bearing Loads
This procedure, often referred to as a "Jack-Up Test," is a precise method to determine the static load on a specific main propulsion shaft bearing. It is a critical component of shaft alignment verification.
**1. Objective:**
To quantify the vertical reaction force (i.e., the load) exerted by the shafting onto a specific intermediate, plummer, or sterntube bearing. This data is compared against the manufacturer's design specifications to ensure proper shaft alignment and prevent bearing overload or underload.

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