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Class 2 (2nd Engineer) MEKM 📅 Oct 2018

Exam Question

With reference to bottom end bolts for medium speed four stroke engines:

(a) Explain why bottom end bolts will ultimately fail under normal operating conditions

(b) Identify the features incorporated into bolt design to inhibit failure

(c) Explain how bolt failure may be hastened when maintenance is carried out

(d) Describe, as Second Engineer, your strategy for preventing bolt failure.

Exam question diagram

Reference Answer

(a) Bottom end bolts in medium-speed four-stroke engines experience a complex and dynamic stress environment, ultimately leading to fatigue failure under normal operating conditions. These stresses include:
Tensile Stress:  
Initial tightening of the nuts places the bolts under significant tensile stress. This is the primary load on the bolt.
Fluctuating Stresses:

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