Yamaha 150AET - User Manual

Other manuals for Yamaha 150AET

Rigging Guide226 pages

Questions and Answers

M
Martha LinAug 18, 2025
What to do if Yamaha 150AET fuel management gauge shows incorrect fuel consumption?
- K
  Kaitlin NealAug 18, 2025
  If the fuel management gauge shows incorrect fuel consumption, the engine recognition might be wrong (especially for multi-applications). To fix this, default the engine number and turn the key switch on in order from the portside engine to re-memorize each engine number.
R
Richard DuncanAug 21, 2025
What to do if the Yamaha Outboard Motor gauge display does not wake up?
- W
  williamsalexAug 21, 2025
  If the gauge display doesn't wake up, it could be due to a lack of electrical power or a damaged gauge. Try these steps: replace the fuse, securely connect the couplers, replace any damaged wires or hubs, or, if necessary, replace the gauge itself.
E
Eric RodriguezAug 23, 2025
Why Yamaha 150AET Outboard Motor illumination does not light?
- J
  Jennifer HendersonAug 23, 2025
  If the illumination does not light, it could be due to a lack of electrical power or a damaged gauge. You should try replacing the fuse, connecting the couplers securely, replacing the damaged wire or hub, or replacing the gauge.
W
wongfaithAug 25, 2025
How to fix Yamaha Outboard Motor tachometer showing incorrect engine RPM?
- B
  Brittany MendezAug 26, 2025
  If the tachometer shows an incorrect engine RPM, the engine recognition might be wrong (especially for multi-applications). To correct this, push the 'SET' button for 10 seconds to default the engine number, then memorize each engine number again.
A
Ashley GilbertAug 27, 2025
What causes Yamaha 150AET fuel management gauge to show incorrect remaining fuel?
- B
  bradley56Aug 27, 2025
  If the fuel management gauge shows incorrect remaining fuel, the fuel capacity setting may be wrong (specifically for SQR Fuel mgt Gauge). Fill the tank with fuel, and set the correct fuel tank capacity.
L
lynn30Aug 29, 2025
What to do if Yamaha 150AET gauge shows “----”?
- L
  lperkinsAug 30, 2025
  If the gauge displays '----', it indicates that the digital signal is not being received. Check that the couplers are securely connected and replace any damaged bus wires or hubs.
T
Tracy BarronSep 1, 2025
Why Yamaha 150AET Speedometer or Comb. Speedometer & Fuel mgt gauge shows incorrect fuel level?
- C
  Charles HendersonSep 1, 2025
  If the speedometer or combination speedometer & fuel management gauge shows an incorrect fuel level, the fuel sensor selection is likely wrong. Set up the fuel sensor to the correct resistance.
J
Jeffery WilliamsSep 3, 2025
How to fix Yamaha 150AET trim gauge showing incorrect position?
- B
  Bailey RiveraSep 3, 2025
  If the trim gauge shows an incorrect position, the initial position setting might be wrong, or the trim sender could be damaged. Put the motor in the fully trimmed-in position and reset the initial (zero) trim angle. If that doesn't work, replace the trim sender.
P
powelldanaSep 6, 2025
Why Yamaha Outboard Motor gauge operates unstably?
- C
  codyhernandezSep 6, 2025
  If the gauge operates unstably, it could be because a resistor is not connected to the ending hubs. Connect the gray 6-pin cap to the ending multi-hubs.
M
Michaela CardenasSep 8, 2025
What causes Yamaha 150AET Outboard Motor gauge response to be poor or down?
- A
  Annette SimmonsSep 8, 2025
  If the gauge response is poor or down, a market obtainable unit connected to the system may have failed, or the signal volume has exceeded 50% of the capacity. Try replacing the unit or removing the heavy signal output unit.

Summary

How to Use This Manual

Manual Format

Details how procedures are organized in a sequential, step-by-step format.

Model Indication

Explains how multiple model indications are noted in the manual.

Illustrations

States that illustrations represent all designated models.

Cross References

Explains that cross references are kept to a minimum.

Identification and Serial Numbers

Serial Number Location

Describes the location of the outboard motor's serial number on a label.

Starting Serial Numbers

Lists the starting serial number blocks for various models.

Special Tools for Service

Measuring Tools

Lists and describes various measuring tools with their part numbers.

Flywheel Magnet Assembly

Removing and Installing Flywheel Magnet Assembly

Provides instructions for removing and installing the flywheel magnet assembly.

Cylinder Body Assembly Procedures

Installing the Crankshaft Assembly

Details the steps for installing the crankshaft assembly into the cylinder body.

Installing Piston and Connecting Rod Assemblies

Guides the installation of piston and connecting rod assemblies with notes.

Propeller Shaft Housing Assembly

Inspecting the Dog Clutch

Describes inspection of the dog clutch for damage or wear.

Inspecting the Propeller Shaft

Describes inspection of the propeller shaft for damage or wear.

Assembling the Propeller Shaft Housing

Provides steps for installing the needle bearing and oil seal.

Inner Propeller Shaft Assembly

Disassembling and Assembling Inner Propeller Shaft

Details the process of disassembling and assembling the inner propeller shaft.

Shimming for Forward Gear

Selecting Forward Gear Shims

Explains how to select shims to achieve a specified value for forward gear.

Backlash Measurement (Dual Propeller Models)

Measuring Front Gear Backlash

Details the procedure for measuring front gear backlash.

This document serves as a comprehensive service manual for a range of outboard motor models, providing detailed instructions for maintenance, repair, and assembly.

Function Description

The manual outlines procedures for various components of the outboard motor, including the power unit, drive unit, and lower unit. It covers tasks such as engine assembly, propeller shaft housing assembly, water pump installation, and backlash adjustments. The manual emphasizes the use of correct special tools to ensure accurate assembly and tune-up, warning against improvisation to prevent equipment damage.

Important Technical Specifications

The manual covers a wide array of models, including 150AET, L150AET, 150FETO, L150FETO, 150GETO, D150HETO, 175AET, 175DETO, 175FETO, 200AET, L200AET, 200FETO, L200FETO, 200GETO, 225DET, and 225DETO, along with their USA and Canada names (e.g., C150TR, S150TR, L150TR, P150TR).

Engine Specifications:

Exhaust System: Through prop boss.
Lubrication System: Oil injection or Pre-mix Oil injection (depending on model).
Cooling System: Water.
Ignition System: Microcomputer (CDI).
Starting System: Electric.
Advance Type: Mechanical and microcomputer.

Fuel and Oil:

Fuel Type: Unleaded regular gasoline.
Fuel Rating: 86 or 91 RON (Research Octane Number).
Engine Oil Type: 2-stroke outboard engine oil.
Engine Oil Grade: TC-W3.
Engine Oil Capacity (engine oil tank): 0.9 L (0.95 US qt, 0.79 Imp qt).
Engine Oil Capacity (sub-oil tank): 10.5 L (11.1 US qt, 9.2 Imp qt).
Gear Oil Type: Hypoid gear oil SAE 90.
Gear Oil Total Quantity: 980 cm³ (33.1 US oz, 34.5 Imp oz) for most models; 870 cm³ (29.4 US oz, 30.6 Imp oz) for L200FETO.

Bracket:

Trim Angle (at 12° boat transom): -4 to 16 degrees.
Tilt-up Angle: 70 degrees.
Steering Angle: 35 + 35 degrees.

Drive Unit:

Gear Shift Positions: F-N-R (Forward-Neutral-Reverse).
Gear Ratio: 1.86 (26/14).
Reduction Gear Type: Spiral bevel gear.
Clutch Type: Dog clutch.
Propeller Shaft Type: Spline.
Propeller Direction (rear view): Clockwise or Counterclockwise (for L200FETO).

Torque Specifications:

Flywheel magnet assembly nut: 190 Nm (19 m·kgf, 137 ft·lb) for Oil injection and 225DET models; 165 Nm (16.5 m·kgf, 120 ft·lb) for Pre-mix except for 225DET models.
Cylinder head bolts (1st step): 4 Nm (0.4 m·kgf, 2.9 ft·lb).
Cylinder head bolts (2nd step): 8 Nm (0.8 m·kgf, 5.8 ft·lb).
Cylinder head bolts (1st step, specific bolts): 15 Nm (1.5 m·kgf, 11 ft·lb).
Cylinder head bolts (2nd step, specific bolts): 30 Nm (3.0 m·kgf, 22 ft·lb).
Propeller nut (for backlash measurement): 10 Nm (1.0 m·kgf, 7.2 ft·lb).
Universal puller (for propeller shaft housing puller): 10 Nm (1.0 m·kgf, 7.2 ft·lb).

Special Tools:

Tachometer: P/N. YU-08036-A / 90890-06760.
Pressure tester: P/N. YB-35956 / 90890-06762.
Mity vac: P/N. YB-35956 / 90890-06756.
Pinion height gauge: P/N. YB-34432-7, YB-34432-11, YB-34432-97 / 90890-06702.
Dial gauge set: P/N. YU-03097 / 90890-01252.
Magnetic base: P/N. YU-34481 / 90890-06705.
Digital caliper: P/N. 90890-06704.
Backlash indicator: P/N. YB-06265 / 90890-06706.
Magnetic base attaching plate: P/N. YB-07003 / 90890-07003.
Hydraulic pressure gauge: P/N. 90890-06776.
Up-relief valve attachment: P/N. 90890-06773.
Down-relief valve attachment: P/N. 90890-06774.
Piston ring compressor: YU-33294 / 90890-06530.
Shift rod wrench: YB-06052 / 90890-06052.
Bearing/oil seal attachment: YB-06196 / 90890-06610.
Driver rod: YB-06071 / 90890-06604.
Bearing/oil seal depth plate: 90890-06603.
Bearing/oil seal attachment (for oil seal): YB-06195 / 90890-06633.
Propeller shaft housing puller: YB-06502 / 90890-06502.
Universal puller: YB-06540 / 90890-06540.

Installation Positions:

Needle bearing installation position: 24.75 - 25.25 mm (0.974 - 0.994 in).
Oil seal installation position: 4.75 - 5.25 mm (0.187 - 0.207 in).

Backlash Specifications:

Front gear backlash: 0.19 - 0.59 mm (0.007 - 0.023 in).

Usage Features

The manual is structured for ease of use, with procedures organized in a sequential, step-by-step format. It includes illustrations for all designated models to aid understanding. Cross-references are kept to a minimum, directing users to relevant sections or chapters.

Model Identification:

The manual provides a table of model names, USA and Canada names, and their corresponding indications for easy reference.
Outboard motor serial numbers are stamped on a label attached to the port clamp bracket. This label is specially treated to crack if peeled off, serving as an anti-theft measure. The label includes the model name, approval model code, transom height, and serial number. Starting serial number blocks are also provided.

Troubleshooting:

The manual uses an arrow symbol (→) to indicate the course of action required for faulty components (e.g., "Pitting/scratches → Replace" for bearings).

Maintenance Features

The manual includes a detailed "Maintenance Interval Chart" as a guide for general maintenance, with intervals adjustable based on operating conditions.

Maintenance Intervals:

Initial (Break-in): 10 hours.
Every: 50 hours (3 months), 100 hours (6 months), 200 hours (1 year), and every month (for battery inspection/charge).

Maintenance Tasks:

Top Cowling: Inspect fit.
Fuel System: Inspect fuel line, clean/inspect fuel filter, clean carburetor.
Power Unit: Inspect water leakage, motor exterior, exhaust leakage, clean/flush cooling water passage.
Control System: Inspect/adjust carburetor synchronization, engine idling speed, remote control shift cable, remote control throttle cable.
Oil Injection System: Clean oil tank water drain, inspect/adjust oil pump lever.
Power Trim and Tilt Unit: Inspect power trim and tilt fluid.
Lower Unit: Change gear oil, inspect lower unit leakage, inspect propeller.
General: Inspect/replace anodes, inspect/charge battery, clean/adjust/replace spark plugs, adjust/reconnect wiring and connectors, tighten bolts and nuts, grease lubrication points.

Reusable/Non-reusable Parts:

Gaskets for cylinder heads are explicitly marked as "Not reusable" and must be replaced during assembly.

Installation Procedures:

For most installation steps, the manual instructs to "reverse the removal procedure," simplifying instructions.
Specific instructions are provided for installing components like the crankshaft assembly (aligning labyrinth ring end gaps and bearing locating pins) and piston and connecting rod assemblies (lubricating cylinder walls, reinstalling in original cylinders, orienting "S" and "P" marks for starboard and port sides respectively, and ensuring "UP" mark faces the flywheel).