Chrome steel liners
Chrome steel liner more cost- efficient.
In case stern tube seal overhaul is performed on a system with a ceramic coated liner, the customer should be made aware that we recommend bonding the seals on a fresh running surface (for an AFT system this means installing or removing a distance ring).
If that is not possible, RM Propulsion recommends to replace the coated liner with a new chrome steel liner. We don’t see the advantage of a ceramic coated liner and we are convinced that the use of a regular chrome steel liner is more cost-efficient.
If a customer insists on bonding new stern tube seals on a ceramic coated liner with visual polish marks, the surface roughness needs to be measured and found between 0,4 and 0,8 Ra.
If this is not the case or if no measurement can be taken (only visual proof of polishing) RM Propulsion will only grant a limited warranty on the stern tube seal overhaul on that system.
Issues related to severe wear or overheating of the sealing rings will not be covered by our service warranty.