Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3

Section 1C - Troubleshooting

Precautions . . . . . . . . . . . . . . . . . . . . . . . .

1C-2

1C-3

1C-4

1C-5

1C-6

Poor Fuel Economy . . . . . . . . . . . . . . . . . 1C-14

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

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

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 . . . . . . . . . . . . . . . . .

Thunderbolt V Ignition (No Spark) . . . 1C-10

Testing Thunderbolt V Ignition System 1C-10

Fuel System Rich . . . . . . . . . . . . . . . . .

Fuel System Lean . . . . . . . . . . . . . . . .

Miscellaneous . . . . . . . . . . . . . . . . . . . .

1C-7

1C-8

1C-9I

1C-9

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

REMOVAL AND INSTALLATION

Section 2A - MCM Models

Torque Specifications . . . . . . . . . . . . . . . .

2A-2

Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubricants / Sealants / Adhesives . . . . .

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation and Alignment . . . . . . . . . . . .

Engine Connections . . . . . . . . . . . . . .

Electrical Connections . . . . . . . . . . . . .

Mercathode Connections . . . . . . . . . .

Shift Cable Installation . . . . . . . . . . . .

Power Steering Connections . . . . . . .

Fuel Supply Connections . . . . . . . . . .

Throttle Cable Installation and

2A-2

2A-3

2A-5

2A-10

2A-11

2A-12

2A-13

Adjustment . . . . . . . . . . . . . . . . . . . . . .

2A-14

90-861328--1

NOVEMBER 1999

Page v

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Product Specification

Categories	Mercury MerCruiser Manuals
Tags	Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID
Model Year	1998, 1999, 2000, 2001
Download File	Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step. - 225 pages
Document File Type	PDF
Copyright	Attribution Non-commercial

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Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 SKU UPC Model

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