Class 2 (2nd Engineer) MEKG 📅 Mar 2025

Exam Question

With reference to sleeved keyless propellers:

(a) State with reasons why the following practices are not advisable when removing the propeller from its shaft: (8)

(i) Expansion of boss by intense concentrated heating by blow torch

(ii) The use of wedges or jacks.

(b) Describe a system that is used to remove the propeller from its shaft. (8)

Reference Answer

### (a) Inadvisable Practices for Propeller Removal
It is imperative that the precision-machined tapered surfaces of the shaft and propeller boss are protected during removal. The entire principle of torque transmission in a keyless propeller relies on the frictional grip generated by a precise interference fit. Any damage to these surfaces compromises the integrity of this fit.
**(i) Expansion of boss by intense concentrated heating by blow torch**
This practice is not advisable and is strictly prohibited by manufacturers for the following reasons:

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