Propeller Shaft Alignment

🛠 Tools & Materials Needed

Step-by-Step Instructions

1. 1

   Haul the boat or work with boat in the water (in-water alignment is more accurate).

2. 2

   Remove the propeller and inspect the shaft for straightness using a dial indicator.

3. 3

   Check cutless bearing for wear by moving shaft up and down; more than 1/16" movement requires replacement.

4. 4

   Open the access panel to the shaft coupling and engine mounts.

5. 5

   Measure the gap between the shaft coupling halves using feeler gauges at 12, 3, 6, and 9 o clock positions.

6. 6

   All measurements should be within 0.003 inches (0.08mm) of each other.

7. 7

   Adjust engine mount height using the adjustment nuts to achieve parallel alignment.

8. 8

   Also check for angular alignment by comparing gap measurements.

9. 9

   Recheck alignment after any engine mount adjustments; repeat until within spec.

10. 10

    Torque all coupling bolts to manufacturer specification and recheck after first sea trial.