Mercury D4.2L D-Tronic

TROUBLESHOOTING SERVICE MANUAL NUMBER 22
Page 1C-32 90-860074--1 FEBRUARY 2002
Noisy Pump
Cause Special Information
1 Drive belt 1. Check belt tension
2. Low fluid level
3. Air in fluid 3. Air leak in lines, pump, or air form
installation
4. Faulty Pump 4. Use stethoscope to listen for noise in
pump
5. Restricted fluid passages 5. Kinks or debris in hoses or debris in
passages
6. Stop nut adjusted improperly 6. Refer to appropriate Mercury Mer-
Cruiser Sterndrive Service Manual
7. Steering cables installed that do not
meet ABYC standards
7. Refer to appropriate Mercury
MerCruiser Sterndrive Service Manual
Fluid Leaks
Cause Special Information
1. Loose hose connections 1. Refer to SECTION 9A for bleeding
instructions
2. Damaged hose
3. Oil leaking from top of pump 3. System overfilled; fluid contains water;
fluid contains air
4. Cylinder piston rod seal
5. Faulty seals in valve
6 Faulty seals in O-rings in pump
7. Cracked or porous metal parts