Diagnose Lower Unit Malfunction
Trouble Check Chart
| Condition | Possible cause | Correction / Reference Item |
|---|---|---|
| Engine stalls when engaging gear | Idling speed set too low. 'Propeller shaft bearings damaged, lacking lubrication or seized. |
Adjustment. Replace. |
| Engaging gear(s) has no effect on propulsion | Clutch out of adjustment. Driveshaft broken or splines damaged. Chipped or worn dog clutches. Propeller not secured correctly (fallen off). |
Adjustment. Replace. Replace. Inspection or retighten |
| Loss of power (Assuming engine is OK) | Propeller bush slipping. Bent or worn propeller. |
Replace. Repair or replace. |
| Engine shakes the boat | Failed propeller bush. Bent driveshaft or propeller shaft. Damaged propeller |
Replace. Replace. Replace. |
| Clutch will not engage or disengage | Seized shift rod. Clutch shaft and clutch rod have become detached. Electronic shift control system is failed |
Inspection. Inspection. Inspection. |
