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Class 2 (2nd Engineer) MEP 📅 Jan 2023

Exam Question

Discuss the validity of EACH of the following statements with respect to large slow speed diesel engines:

(a) Bearing clearances obtained by taking leads (or use of plastic inserts) are fundamentally more accurate than those obtained with the use of feelers.

(b) Bearing wear down can be measured by taking deflections.

(c) A timing chain should be renewed when its slackness causes late fuel injection and exhaust valve operation.

(d) Timing chain slackness is solely due to stretch of the link plates.

Reference Answer

(a) Bearing clearances obtained by taking leads (or using plastic inserts) are fundamentally more accurate than those obtained using feelers.
Validity: True.
Measurement of bearing clearances by lead wire is a traditional method in which lead wires are inserted circumferentially at different places and tightened to rated torque. Measurement of the squeezed lead wire gives circumferential clearance of the bearing
This method is most accurate if good quality lead wire is used

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