Under 46 CFR §61.20-23, a water-lubricated stern tube bearing (non-rubber) on a vessel with propelling machinery located amidship must be rebushed when clearance reaches what value for a propeller shaft of 254 mm (10 in) diameter?

Question

Accepted Answer

C. 7.95 mm (0.3125 in) — 46 CFR §61.20-23(a)(1) sets the rebushing clearance at 7.95 mm (0.3125 in) for shafts exceeding 229 mm (9 in) but not exceeding 305 mm (12 in) in diameter, with propelling machinery amidship. A 254 mm shaft falls within that range.

Answer

A. 6.4 mm (0.25 in)

Answer

B. 9.53 mm (0.375 in)

Answer

D. 1.6 mm (0.0625 in)

Under 46 CFR §61.20-23, a water-lubricated stern tube bearing (non-rubber) on a vessel with propelling machinery located amidship must be rebushed when clearance reaches what value for a propeller shaft of 254 mm (10 in) diameter?

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