Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23

SERVICE MANUAL NUMBER 23
TROUBLESHOOTING
IMPORTANT INFORMATION
Section 1C - Troubleshooting
1
C
Table of Contents
Precautions  . . . . . . . . . . . . . . . . . . . . . . . . . .  1C-2
Used Spark Plug Analysis  . . . . . . . . . . . . . .  1C-3
Spark Plug Analysis  . . . . . . . . . . . . . . . . . . .  1C-4
Normal Condition  . . . . . . . . . . . . . . . . . . .  1C-4
Chipped Insulator . . . . . . . . . . . . . . . . . . .  1C-4
Wet Fouling (Oil Deposits)  . . . . . . . . . . .  1C-4
Cold Fouling  . . . . . . . . . . . . . . . . . . . . . . .  1C-5
Overheating   . . . . . . . . . . . . . . . . . . . . . . .  1C-5
High Speed Glazing . . . . . . . . . . . . . . . . .  1C-5
Scavenger Deposits   . . . . . . . . . . . . . . . .  1C-6
Pre-Ignition Damage  . . . . . . . . . . . . . . . .  1C-6
Reversed Coil Polarity . . . . . . . . . . . . . . .  1C-6
Splashed Deposits . . . . . . . . . . . . . . . . . .  1C-7
Mechanical Damage  . . . . . . . . . . . . . . . .  1C-7
Poor Boat Performance and/or Poor
Maneuverability . . . . . . . . . . . . . . . . . . . . . .  1C-8
Improper Full Throttle Engine RPM  . . . . . . 1C-9
RPM Too High   . . . . . . . . . . . . . . . . . . . . .  1C-9
RPM Too Low  . . . . . . . . . . . . . . . . . . . . . .  1C-9
Engine Cranks Over But Will Not Start
Or Starts Hard  . . . . . . . . . . . . . . . . . . . . . .  1C-10
Important Information  . . . . . . . . . . . . . .  1C-10
Fuel System Rich . . . . . . . . . . . . . . . . . .  1C-10
Fuel System Lean  . . . . . . . . . . . . . . . . .  1C-10
Miscellaneous . . . . . . . . . . . . . . . . . . . . .  1C-10
Engine Will Not Crank Over . . . . . . . . . . . .  1C-11
Charging System Inoperative  . . . . . . . . . . 1C-11
Noisy Alternator . . . . . . . . . . . . . . . . . . . . . .  1C-12
Instrumentation Malfunction  . . . . . . . . . . . 1C-12
Radio Noise  . . . . . . . . . . . . . . . . . . . . . . . . .  1C-12
Poor Fuel Economy  . . . . . . . . . . . . . . . . . .  1C-13
Engine Runs Poorly at Idle  . . . . . . . . . . . .  1C-13
Engine Runs Poorly At High RPM  . . . . . . 1C-14
Engine Acceleration Is Poor  . . . . . . . . . . .  1C-14
Troubleshooting with Vacuum Gauge  . . .  1C-15
Engine Noise  . . . . . . . . . . . . . . . . . . . . . . . .  1C-15
Important Information  . . . . . . . . . . . . . .  1C-15
Valve Cover Area . . . . . . . . . . . . . . . . . .  1C-16
Cylinder Area  . . . . . . . . . . . . . . . . . . . . .  1C-16
Camshaft Area  . . . . . . . . . . . . . . . . . . . .  1C-17
Crankshaft Area  . . . . . . . . . . . . . . . . . . .  1C-17
Miscellaneous . . . . . . . . . . . . . . . . . . . . .  1C-18
Oil Pressure  . . . . . . . . . . . . . . . . . . . . . . . . .  1C-19
Miscellaneous . . . . . . . . . . . . . . . . . . . . .  1C-19
Low Oil Pressure  . . . . . . . . . . . . . . . . . .  1C-20
High Oil Pressure . . . . . . . . . . . . . . . . . .  1C-20
Excessive Oil Consumption . . . . . . . . . . . .  1C-21
Water In Engine . . . . . . . . . . . . . . . . . . . . . .  1C-22
Important Information  . . . . . . . . . . . . . .  1C-22
Water on Top of Pistons  . . . . . . . . . . . .  1C-23
Water in Crankcase Oil  . . . . . . . . . . . . .  1C-23
Engine Overheats  . . . . . . . . . . . . . . . . . . . .  1C-24
Mechanical  . . . . . . . . . . . . . . . . . . . . . . .  1C-24
Engine Overheats  . . . . . . . . . . . . . . . . . . . .  1C-25
Cooling System  . . . . . . . . . . . . . . . . . . .  1C-25
Insufficient Water Flow from Belt
Driven Seawater Pickup Pump  . . . . . 1C-26
Power Steering  . . . . . . . . . . . . . . . . . . . . . .  1C-27
Poor, Erratic or No Assist  . . . . . . . . . . .  1C-27
Noisy Pump . . . . . . . . . . . . . . . . . . . . . . .  1C-28
Fluid Leaks  . . . . . . . . . . . . . . . . . . . . . . .  1C-28
90-861326--1   MARCH 1999
Page 1C-1
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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(1 votes, average: 5 out of 5)
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Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 SKU UPC Model
Matt on Apr 08, 2015.

Just need the manual. Wrote review. Can't technically review what I haven't seen yet...


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