46 CFR 61.20-23
§ 61.20-23 Tailshaft clearance; bearing weardown.
United States · 46 CFR — Shipping · Status: effective
Cite this
- Citation
- 46 CFR 61.20-23, § 61.20-23 Tailshaft clearance; bearing weardown, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/225331
- Permanent ID
ys:prov:225331@1- SHA-256
7c56de751f005b00fcbd67e11f1afa8c6fb9952c8b2bd606f32fe46bad080137
The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.
Full text
(a) Water lubricated bearings, other than rubber, must be rebushed as follows:
(1) Where the propelling machinery is located amidship, the after stern tube bearing must be rebushed when it is worn down to 6.4 mm (0.25 in) clearance for shafts of 229 mm (9 in) or less in diameter, 7.95 mm (0.3125 in) clearance for shafts exceeding 229 mm (9 in) but not exceeding 305 mm (12 in) in diameter, and 9.53 mm (0.375 in) clearance for shafts exceeding 305 mm (12 in) in diameter.
(2) Where the propelling machinery is located aft, the after stern tube bearing must be rebushed when weardown is 1.6 mm (.0625 in) less than the applicable clearance for propelling machinery located amidship.
(b) Water lubricated rubber bearings must be rebushed when any water groove is half the original depth.
(c) Oil lubricated bearings must be rebushed when deemed necessary by the Officer in Charge, Marine Inspection. The manufacturer's recommendation must be considered in making this determination.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.