SERVICE MANUAL NUMBER 25
TROUBLESHOOTING
IMPORTANT INFORMATION
Section 1C - Troubleshooting
1
C
Table of Contents
Precautions . . . . . . . . . . . . . . . . . . . . . . . .
Used Spark Plug Analysis . . . . . . . . . . . .
Normal Condition . . . . . . . . . . . . . . . . .
Chipped Insulator . . . . . . . . . . . . . . . . .
Wet Fouling (Oil Deposits) . . . . . . . . .
Cold Fouling . . . . . . . . . . . . . . . . . . . . .
Overheating . . . . . . . . . . . . . . . . . . . . .
High Speed Glazing . . . . . . . . . . . . . . .
Scavenger Deposits . . . . . . . . . . . . . .
Pre-Ignition Damage . . . . . . . . . . . . . .
Reversed Coil Polarity . . . . . . . . . . . . .
Splashed Deposits . . . . . . . . . . . . . . . .
Mechanical Damage . . . . . . . . . . . . . .
Poor Boat Performance and/or
Poor Maneuverability . . . . . . . . . . . . . . . .
Improper Full Throttle Engine RPM . . . .
RPM Too High . . . . . . . . . . . . . . . . . . .
RPM Too Low . . . . . . . . . . . . . . . . . . . .
Engine Cranks Over But Will Not Start
Or Starts Hard . . . . . . . . . . . . . . . . . . . . . .
mportant Information . . . . . . . . . . . . . . . . .
1C-2
1C-3
1C-3
1C-3
1C-4
1C-4
1C-4
1C-5
1C-5
1C-5
1C-6
1C-6
1C-6
Poor Fuel Economy . . . . . . . . . . . . . . . . . 1C-14
Engine Runs Poorly at Idle . . . . . . . . . . . 1C-14
Engine Runs Poorly At High RPM . . . . . 1C-15
Engine Acceleration Is Poor . . . . . . . . . . 1C-16
Troubleshooting with Vacuum Gauge . . 1C-16
Engine Noise . . . . . . . . . . . . . . . . . . . . . . . 1C-17
Important Information . . . . . . . . . . . . . 1C-17
Valve Cover Area . . . . . . . . . . . . . . . . . 1C-17
Cylinder Area . . . . . . . . . . . . . . . . . . . . 1C-18
Camshaft Area . . . . . . . . . . . . . . . . . . . 1C-18
Crankshaft Area . . . . . . . . . . . . . . . . . . 1C-19
Miscellaneous . . . . . . . . . . . . . . . . . . . . 1C-20
Oil Pressure . . . . . . . . . . . . . . . . . . . . . . . . 1C-21
Miscellaneous . . . . . . . . . . . . . . . . . . . . 1C-21
Low Oil Pressure . . . . . . . . . . . . . . . . . 1C-22
High Oil Pressure . . . . . . . . . . . . . . . . . 1C-22
Excessive Oil Consumption . . . . . . . . . . . 1C-23
Water In Engine . . . . . . . . . . . . . . . . . . . . . 1C-24
Important Information . . . . . . . . . . . . . 1C-24
Water on Top of Pistons . . . . . . . . . . . 1C-25
Water in Crankcase Oil . . . . . . . . . . . . 1C-25
Engine Overheats . . . . . . . . . . . . . . . . . . . 1C-26
Mechanical . . . . . . . . . . . . . . . . . . . . . . 1C-26
Engine Overheats . . . . . . . . . . . . . . . . . . . 1C-27
Cooling System . . . . . . . . . . . . . . . . . . 1C-27
Insufficient Water Flow from
1C-7
1C-8
1C-8
1C-8
1C-9I
1C-9
Thunderbolt V Ignition (No Spark) . . . 1C-10
Testing Thunderbolt V Ignition System 1C-10
Fuel System Rich . . . . . . . . . . . . . . . . .
Fuel System Lean . . . . . . . . . . . . . . . .
Miscellaneous . . . . . . . . . . . . . . . . . . . .
1C-11
1C-11
1C-11
Engine Will Not Crank Over . . . . . . . . . . . 1C-12
Charging System Inoperative . . . . . . . . . 1C-12
Noisy Alternator . . . . . . . . . . . . . . . . . . . . . 1C-13
Instrumentation Malfunction . . . . . . . . . . 1C-13
Radio Noise . . . . . . . . . . . . . . . . . . . . . . . . 1C-13
Belt Driven Seawater Pickup Pump . 1C-28
Power Steering . . . . . . . . . . . . . . . . . . . . . 1C-29
Poor, Erratic or No Assist . . . . . . . . . . 1C-29
Noisy Pump . . . . . . . . . . . . . . . . . . . . . . 1C-30
Fluid Leaks . . . . . . . . . . . . . . . . . . . . . . 1C-30
90-861328--1
NOVEMBER 1999
Page 1C-1
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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