Mercury MerCruiser D2.8L D-Tronic Service Manual page 659

SERVICE MANUAL NUMBER 22
Troubleshooting Charts (Continued)
CONDITION
EXCESSIVE
ENGINE
NOISES
ALTERNATOR
NOT
CHARGING OR
INSUFFICIENT
CHARGING
90-860074--1 FEBRUARY 2002
POSSIBLE CAUSES
1. Drive belt squeal, insufficient
tension or abnormally high
loading.
2. Intake air or exhaust leaks.
3. Excessive valve lash.
4. Turbocharger noise.
5. Gear train noise.
6. Power function knock.
1. Loose or corroded battery.
2. Alternator belt slipping.
3. Alternator pulley loose on
shaft.
4. Improperly operating alterna-
tor.
EDI DIAGNOSIS
CORRECTION
1. Inspect the drive belt. Check
drive belt tension.
2. Refer to Excessive Exhaust
smoke (Engine
Performance).
3. Make sure the push rods are
not bent and rocker levers are
not severely worn Replace
Bent or severely worn pads.
4. Check turbocharger impeller
and turbine wheel for housing
contact. Repair/replace as
required.
5. Visually inspect and measure
gear backlash. Replace gears
as required.
6. Check/replace rod and main
bearings.
1. Clean/tighten battery
connection.
2. Check/replace and adjust
belt.
3. Tighten pulley.
4. Check/replace alternator.
Diagnosis
Page 5E-91