Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26

SERVICE MANUAL NUMBER 26
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 Is Hard To Start  . . . . . . . . . . . . . . . . . .  1C-10
Important Information  . . . . . . . . . . . . . .  1C-10
EST Ignition System Check . . . . . . . . . . . .  1C-11
Test Description  . . . . . . . . . . . . . . . . . . .  1C-11
Ignition System Check   . . . . . . . . . . . . .  1C-12
Engine Will Not Crank Over/Starter
Engine Runs Poorly At Idle  . . . . . . . . . . . .  1C-18
Engine Acceleration Is Poor  . . . . . . . . . . .  1C-19
Engine Runs Poorly At High RPM  . . . . . . 1C-19
Poor Fuel Economy  . . . . . . . . . . . . . . . . . .  1C-20
Radio Noise  . . . . . . . . . . . . . . . . . . . . . . . . .  1C-21
Troubleshooting With Vacuum Gauge . . .  1C-21
Miscellaneous  . . . . . . . . . . . . . . . . . . . . . . .  1C-21
Instrumentation Malfunction  . . . . . . . . . . . 1C-22
Engine Noise  . . . . . . . . . . . . . . . . . . . . . . . .  1C-22
Important Information  . . . . . . . . . . . . . .  1C-22
Valve Cover Area . . . . . . . . . . . . . . . . . .  1C-23
Cylinder Area  . . . . . . . . . . . . . . . . . . . . .  1C-23
Camshaft Area  . . . . . . . . . . . . . . . . . . . .  1C-23
Crankshaft Area  . . . . . . . . . . . . . . . . . . .  1C-24
Miscellaneous . . . . . . . . . . . . . . . . . . . . .  1C-25
Oil Pressure  . . . . . . . . . . . . . . . . . . . . . . . . .  1C-26
Miscellaneous . . . . . . . . . . . . . . . . . . . . .  1C-26
Low Oil Pressure  . . . . . . . . . . . . . . . . . .  1C-27
High Oil Pressure . . . . . . . . . . . . . . . . . .  1C-27
Excessive Oil Consumption  . . . . . . . . .  1C-28
Water in Engine . . . . . . . . . . . . . . . . . . . . . .  1C-29
Important Information  . . . . . . . . . . . . . .  1C-29
Water In Crankcase . . . . . . . . . . . . . . . .  1C-29
Water On Top Of Pistons  . . . . . . . . . . .  1C-30
Engine Overheats  . . . . . . . . . . . . . . . . . . . .  1C-31
Mechanical  . . . . . . . . . . . . . . . . . . . . . . .  1C-31
Cooling System  . . . . . . . . . . . . . . . . . . .  1C-32
Power Steering  . . . . . . . . . . . . . . . . . . . . . .  1C-33
Poor, Erratic or No Assist  . . . . . . . . . . .  1C-33
Noisy Pump . . . . . . . . . . . . . . . . . . . . . . .  1C-34
Fluid Leaks  . . . . . . . . . . . . . . . . . . . . . . .  1C-34
Insufficient Water Flow From Alpha One
Inoperative  . . . . . . . . . . . . . . . . . . . . . . . . .  1C-14
Charging System Inoperative  . . . . . . . . . .  1C-14
Noisy Alternator . . . . . . . . . . . . . . . . . . . . . .  1C-15
Fuel System Rich  . . . . . . . . . . . . . . . . . . . .  1C-15
Fuel System Lean . . . . . . . . . . . . . . . . . . . .  1C-16
Carburetor Malfunction . . . . . . . . . . . . . . . .  1C-16
Sterndrive Unit Seawater Pickup Pump    1C-35
Index
90-861329--1
MARCH 1999
Page 1C-1
Product Specification
CategoriesMercury MerCruiser Manuals
Tags
Model Year1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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(6 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews.
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Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 SKU UPC Model
MARIUZAN GONCALVES on Jun 09, 2018. Good

Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
jerry l clark on Jun 05, 2018.

great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Terence Maulhardt on Apr 25, 2018.

Great resource. Excellent information provided.
Dean Masman on Apr 22, 2018. Need help to

Need help to install automate choke
Vinny on Sep 01, 2014. Tech

Need help to instal automate choke
Jeff on Mar 06, 2013.


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