CP Propeller Equipment - Martin's Marine Engineering Page

Stern tubeThe standard stern tube is designed tobe installed from aft and is bolted to thestern frame boss, fig 17.The forward end of the stern tube issupported by the welding ring. The oilbox and the forward shaft seal arebolted onto the welding ring. This designallows thermal expansion/contractionof the stern tube and decreases thenecessity for close tolerances of thestern tube installation length.Normally the stern tube and the weldingring are supplied with 5 mm machiningallowance for yard finishing.The stern tube and welding ring can besupplied machined and finished, if required.As an option the stern tube can be installedwith epoxy resin.LinersThe stern tube is provided with forwardand aft white–metal liners, fig 18.Sensors for bearing temperature canbe mounted, if required.A thermometer for the forward bearingis standard.SealsAs standard, the stern tube is providedwith forward and after stern tube sealsof the lip ring type having three lip ringsin the after seal and two lip rings in theforward seal, fig 19.2 04 46 49–1.0Stern tubeBossFig 17: Standard stern tube – VBS2 03 24 14–1.0Fig 18: Stern tube white–metal linersCast ironWelding ringLead–basedwhite metalOil box2 03 24 18–2.0Outboard stern tube sealInboard stern tube sealFig 19: Stern tube sealsThis document, and more, is available for download at Martin's Marine Engineering Page - www.dieselduck.net15