LOWER SEAL CRANKSHAFT 26-18843M

Function and technical context

The lower crankshaft seal is an essential component in the sealing system of the marine engine, whose main mission is to seal the lower area of ​​the crankshaft shaft to prevent the leakage of lubricating oil to the outside. This oil seal works in the engine lubrication circuit, supporting constant pressures, temperature changes and vibrations typical of the operation of the propeller. Its deterioration or breakage allows the oil to escape from the crankcase, exposing the lubricant to contamination by salt water and marine humidity, which accelerates internal engine wear and compromises the protection of critical components such as crankshaft, connecting rods and bearings.

When to replace this part?

The crankshaft seals present clear symptoms of failure: oil stains at the base of the engine, loss of lubricant level without apparent cause, or presence of emulsion (oil and water mixture) in the crankcase after sailing in rough seas. Although there is no fixed replacement interval, these seals should be inspected at each seasonal maintenance and replaced if leaks or signs of aging are detected; Preventive replacement is especially recommended if the engine has accumulated many hours of operation or has been stopped for long periods. Changing this seal preventively is much more economical than repairing damage due to rust or seizure of the crankshaft caused by lack of lubrication.

Engine Compatibility

Mercury/MerCruiser

Equivalent manufacturer part numbers

At Marine Parts we know that nautical life does not allow mistakes. If you have doubts about whether this seal is suitable for your engine, we recommend that you consult with our technical team before making the purchase. We have a quick assistance service via WhatsApp where you can confirm compatibility by providing the serial number of your engine.