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Why is the clearance given between bearing journals and the bores?

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in Automotive Engine Design by (137k points)
Why is the clearance given between bearing journals and the bores?

(a) lubrication and metal expansion

(b) Friction

(c) For lubrication

(d) Thermal expansion

The question was posed to me in an interview for internship.

My query is from Valve Train Component Details topic in division Valve Timing Technologies of Automotive Engine Design

1 Answer

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Correct option is (a) lubrication and metal expansion

Easy explanation: The clearance given between bearing journals and the bores are given for lubrication and metal expansion in the range of 0.05 to 0.125mm.

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