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MerCruiser # 26 GM 4 Cylinder 181 cid (3.0L)
90-861329--1
MerCruiser # 26 GM 4 Cylinder 181 cid (3.0L)
90-861329--1
1
2
3
4
5
6
7
...
421
422
Number 26
1
90-861329--1
2
Engine Mechanical Components
4
Replacement Parts
4
Models Covered in This Manual
4
Service Manual Outline
5
Introduction
8
How to Use This Manual
8
How to Read a Parts Manual
9
POWER STEERING PUMP ASSEMBLY
9
Directional References
10
Engine Rotation
10
Propeller Information
11
Water Testing New Engines
12
Boat and Engine Performance
12
GENERAL INFORMATION
13
Marine Fouling
14
Weight Distribution
15
Water in Boat
15
Elevation and Climate
15
IMPORTANT INFORMATION
17
Maintenance Schedule
18
MAINTENANCE
19
Fluid Capacities
21
20-Hour Break-In Period
21
After Break-in Period
22
End of First Season Checkup
22
Gasoline / Alcohol Blends
23
Boat / Motor Storage
24
Winter Storage
24
Warranty
24
Continuing Evaluations
24
Crankcase Oil
25
Adding Crankcase Oil
26
Changing Oil and Filter
27
Priming Engines With Oil
27
Power Steering System
28
Filling and Bleeding
29
Closed Cooling System
30
Flushing System
31
BOAT IN WATER
32
Lubrication
33
Shift Cable
34
Power Package Layup
36
Used Spark Plug Analysis
49
Spark Plug Analysis
50
Cold Fouling
51
Overheating
51
High Speed Glazing
51
Scavenger Deposits
52
Pre-Ignition Damage
52
Reversed Coil Polarity
52
Splashed Deposits
53
Mechanical Damage
53
RPM Too High
55
RPM Too Low
55
Important Information
56
EST Ignition System Check
57
Ignition System Check(1 of 2)
58
Charging System Inoperative
60
Noisy Alternator
61
Fuel System Rich
61
Fuel System Lean
62
Carburetor Malfunction
62
Engine Runs Poorly At Idle
64
Engine Acceleration Is Poor
65
Poor Fuel Economy
66
Radio Noise
67
Miscellaneous
67
Instrumentation Malfunction
68
Engine Noise
68
Valve Cover Area
69
Cylinder Area
69
Camshaft Area
69
Crankshaft Area
70
Low Oil Pressure
73
High Oil Pressure
73
Excessive Oil Consumption
74
Water in Engine
75
Water On Top Of Pistons
76
Engine Overheats
77
Cooling System
78
Power Steering
79
Noisy Pump
80
Fluid Leaks
80
Seawater Pickup Pump
81
REMOVAL AND INSTALLATION
83
Lubricants/Sealers/Adhesives
84
Engine Removal
85
Engine Alignment
93
Engine Connections
95
SERVICE MANUAL NUMBER 26
101
Table of Contents
103
Table of Contents (continued)
104
Torque Specifications
105
Special Tools
106
Engine Specifications
107
Lubricants/Sealants/Adhesives
107
Piston Ring: Oil
108
Piston Pin
108
Crankshaft
108
Camshaft
108
Cylinder Head
109
Valve System
109
Engine Identification
110
Priming Engine With Oil
111
Bearing Failures
112
Improper Seating
113
Fatigue Failure
113
Piston Failures
114
Detonation
115
Engine Mounts
116
Rocker Arm Cover
117
Push Rod Cover
118
Rocker Arm/Push Rod
119
Valve Adjustment
120
Engine Running
121
Hydraulic Valve Lifters
122
Cleaning and Inspection
123
Installation
123
Disassembly
128
Cleaning
128
Inspection
129
Rocker Arm Studs
130
Valve Guide Bore Repair
131
Valve Seats
132
Reassembly
133
Dipstick Specifications
135
Oil Pump
137
Torsional Damper
139
Crankcase Oil Seal
141
Crankcase Front Cover
142
Flywheel and Engine Coupler
143
Rear Main Oil Seal
145
Main Bearings
146
Checking Clearances
147
Main Bearing Replacement
148
Connecting Rod Bearings
149
Inspection and Replacement
149
PISTON RINGS
154
Crankshaft Sprocket
159
Camshaft Gear Replacement
162
Camshaft Bearings
164
Cylinder Block
166
CYLINDER CONDITIONING
168
CYLINDER BORING
168
CYLINDER HONING
169
PISTON SELECTION
170
Oil Filter By-Pass Valve
171
ELECTRICAL SYSTEM
175
Identification
176
Replacement Parts Warning
176
Battery Cable Recommendations
177
Starting System Components
178
Positive Current Flow
182
Charging Guide
183
Slave Solenoid Identification
184
Solenoid Switch
185
Periodic Inspection
185
PG260 Starter Motor
186
PG260 Exploded View
187
Starter Motor Repair
188
STARTING SYSTEM
189
Armature Tests
193
Gear Bearing
194
Shaft Assembly Bearing
195
Drive End Housing Bearing
195
Brushes and Brush Holder
196
Starter Solenoid
202
PG260F1 Starter Motor
205
Exploded View
206
Specifications
222
Description
223
Precautions
224
Cleaning And Inspection
225
Distributor Installation
226
Ignition Timing
227
Component Tests
230
Testing Ignition Coil
231
Testing Pickup Coil
231
Advance Curve
233
Initial Timing 1° ATDC
234
Initial Timing 2° ATDC
235
System Components
241
Periodic Maintenance
242
Drive Belt Tension Adjustment
243
Circuitry Test
244
CHARGING SYSTEM
245
Current Output Test
246
Voltage Output Test
247
Alternator Repair
248
Component Testing
255
Batteries
265
Mando 55 Amp Alternator
266
Battery Isolator Diagram
268
Mando 65 Amp Alternator
269
Special Information
275
QSI SERIES
276
IndexIndex
276
Oil, Fuel and Temperature
277
Battery Gauge
279
Cruiselog Meter
280
Vacuum Gauge
280
Speedometer
281
Tachometer
281
Gauge Replacement
281
Oil Pressure
282
Water Temperature Sender
283
140°F (60°C) 121-147
284
194°F (90°C) 47-55
284
212°F (100°C) 36-41
284
INSTALLATION
285
Fuel Tank Sender
286
Capsule Type
287
Switches
288
Audio Warning System
289
Oil Pressure Switch
290
Water Temperature Switch
290
INSTRUMENTATION
291
Wiring Diagrams
296
A - Ignition Components
297
C - Audio Warning Components
297
10 RED GXL
300
8 RED–PPL
300
WIRING DIAGRAMS
301
PRIMARY STATION
304
SECONDARY STATION
304
Battery Meter Gauge
306
Cruiselog
306
Fuel Gauge and Sender
307
Water Temperature Gauge
308
Oil Pressure Gauge
309
FUEL SYSTEM
311
Lubricants/Sealants
313
Fuel Delivery System
315
Fuel System Components
316
Water Separating Fuel Filter
316
Replacement
317
Testing Fuel Pump
319
Fuel Pump Replacement
320
FUEL PUMP
321
Important Service Information
327
Needle/Seat Change
328
Maintenance
330
Fuel Inlet Filter
331
Adjustments
332
MERCARB 2 BARREL CARBURETOR
333
Choke Setting
334
Final Idle Speed and Mixture
335
Exploded View Parts List
339
FLOAT DROP
354
COOLING SYSTEM
359
Flushing Cooling System
361
Thermostat
363
Draining Instructions
366
SEAWATER COOLED MODELS
367
STANDARD DRAINING PROCEDURES
368
Recommissioning
370
Cooling System Flow Diagram
374
Coolant Recovery Bottle
379
Pressure Cap Maintenance
380
Heat Exchanger Repair
381
Testing Closed Cooling System
381
Testing Heat Exchanger
383
Testing Pressure Cap
383
Changing Coolant
387
SINGLE POINT DRAIN SYSTEM
388
CLOSED COOLED MODELS
389
Draining Diagram
390
Cleaning System
391
EXHAUST SYSTEM
399
Exhaust System
400
MANIFOLD
403
Emissions Testing
405
POWER STEERING
407
With Cold Engine
409
With Warm Engine
410
POWER STEERING PUMP
411
Pump Pulley Replacement
412
System Flow Diagram
420
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