COLLARIN EJE BARRIL Ø110 (AL) 4T

Function and technical context

The barrel shaft collar with a diameter of 110 mm in aluminum for 4-stroke outboard engines is a sealing and structural support element that works in the transmission and sealing system of the tail shaft. Its mission is to keep the propulsion shaft perfectly centered and aligned as it passes through the crankcase or lower casing, avoiding vibrations, play and the entry of water into the drive unit. The integrity of this component is decisive for the durability of the shaft seal and the adjacent bearings: if the collar shows corrosion, deformation or cracks, the alignment of the shaft is compromised, which can cause accelerated wear of the sealing elements, loss of propulsion performance and even the entry of salt water into the engine with the costly breakdowns that this entails. As it is a piece made of aluminum, it offers a strength-to-weight ratio suitable for the marine environment, although it requires periodic monitoring against galvanic corrosion.

When to replace this part?

The most common symptoms of shaft collar wear include abnormal vibrations perceived in the propulsion shaft at different speeds, visible lateral play in the shaft when inspected with the engine off, and the appearance of moisture or traces of water in the area of the shaft seal, indicating that the collar seat no longer guarantees correct sealing. On engines operating in salt or brackish water environments, it is advisable to inspect this component at each seasonal maintenance, paying particular attention to corrosion pitting on the bearing surfaces and any loss of material in the housing. The preventive replacement of the shaft collar, taking advantage of a scheduled revision of the conical group or the transmission system, avoids unplanned stops in navigation and protects higher cost components such as bearings, seals and the shaft itself.

Compatibility table