HOW TO IMPROVE ENGINE STABILITY

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HOW TO IMPROVE ENGINE STABILITY

On recreational boats or sailboats, achieving maximum engine stability is often a challenge.

There are different factors that must be taken into account:

01. Condition / Performance of the engine

02. Condition of the shaft. Ensure that it is not damaged

03. Condition of the cutless bearing

04. Alignment of the shaft

05. Condition of engine mounts

06. Drive shaft coupling alignment

- With the boat in dry dock, check the following points: -

Condition / Performance of the engine

Bad condition of the pistons or injection valves causes the engine to run badly and this leads to excessive engine movement. If this is not fixed, the engine will never run smoothly.

PISTON OVERHEATED

CROWN DAMAGE

Condition of the shaft. Ensure that it is not damaged

This causes premature deterioration of other components. Generates excesive engine movement and causes water to enter the boat.

Condition of the cutless bearing

Due to the rotating movement of the shaft, the cutless bearing will wear out. This leads to anoffset of the shaft, causing lateral movements and causing an erratic rotation. As a result, the shaft shudders and the movement is transmitted to the engine.

INCORRECT

CORRECT

Alignment of the shaft

Before coupling the shaft to the transmission, it is important to correct its position. The shaft should be as central as possible to the stern hole, to avoid rubbing. Misalignment can cause water to leak into the boat.

There are different methods to achieve this.

SHAFT MISALIGNMENT

HOSE TRICK

SHAFT CORRECT ALIGNMENT

SHAFT SEAL

Condition of engine mounts

Once the entire line has been checked and rectified if needed, the condition of the engine mounts isvery important. These flexible mounts are designed to absorb engine movement and to avoid vibrationbeing transmitted to the hull.

Each engine needs specific engine mounts depending on its power, weight, center of gravity and transmission.

As a result, they lose height and absorb less vibration, causing misalignment of the shaft and a decrease in performance.

Over time, these mounts deteriorate and lose their elastic properties.

It is recommended to replace the mounts every 4 years or after 1000 hours of use.

OIL PRESENCE

EXCESSIVE CORROSION

UNSEEABLE HARDNESS NUMBER

Drive shaft coupling alignment

For this, the engine will have to be adjusted on its axis in all directions. It is important to fit the engine to the shaft, not the shaft to the engine.

This can be done by adjusting the levelling nut of the mounts.

Note that it is important not to raise this levelling nut too high.

If it is necessary to raise the engine higher, the use of shims is recommended.

NUT TOO HIGH

USE OF SHIMS

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This causes premature deterioration of other components.
Generates excesive engine movement and causes water to enter the boat.