1988 Chrysler 125HP Motor Repair Manual

The 1988 Chrysler 125HP outboard motor is a powerful marine engine designed for reliable performance on various watercraft. This comprehensive repair manual covers essential maintenance procedures, troubleshooting guides, and step-by-step repair instructions for the 125 horsepower model. Below are key sections covering specifications, maintenance schedules, engine systems, electrical systems, fuel systems, cooling systems, and troubleshooting procedures.

1. Specifications 2. Maintenance Schedule 3. Engine Systems 4. Electrical Systems 5. Fuel System 6. Cooling System 7. Lower Unit 8. Propeller & Drive 9. Troubleshooting 10. Parts & Diagrams 11. Warranty Information

Specifications

Technical specifications for the 1988 Chrysler 125HP outboard motor.

Specification	Details
Horsepower	125 HP @ 5000 RPM
Cylinders	4 cylinders in-line
Displacement	124.4 cubic inches (2038 cc)
Bore x Stroke	3.375" x 3.50" (85.7mm x 88.9mm)
Ignition System	CDI electronic ignition
Starting System	Electric start
Fuel System	Dual barrel carburetor
Gear Ratio	1.86:1
Weight	285 lbs (129 kg)
Oil Type	TC-W3 outboard motor oil

Maintenance Schedule

Regular maintenance procedures and intervals for optimal performance.

Engine oil change: Every 100 hours or annually
Spark plug replacement: Every 100 hours or seasonally
Gearcase lube change: Every 100 hours or annually
Water pump impeller: Every 2 years or 300 hours
Fuel filter replacement: Every 100 hours
Carburetor synchronization: Annually

WARNING! Always disconnect battery before performing maintenance. Use marine-grade parts and lubricants only.

Engine Systems

Detailed procedures for engine component service and repair.

Cylinder head removal and installation
Piston and connecting rod service
Crankshaft and bearings inspection
Timing and synchronization procedures
Compression testing specifications
Valve clearance adjustment

CAUTION! Engine components are precision parts; handle with care and use proper torque specifications.

Electrical Systems

Ignition System: CDI electronic ignition with stator and trigger assembly
Charging System: 15 amp alternator output
Starting System: 12V electric starter motor
Battery: Minimum 450 CCA marine battery recommended
Wiring: Color-coded marine-grade wiring harness
Switches: Key ignition with safety lanyard connection

Fuel System

Carburetor service, fuel pump repair, and fuel line maintenance procedures.

Components: Dual barrel carburetor, mechanical fuel pump, fuel/water separator, anti-siphon valve.

Service procedures: Carburetor float level adjustment, jet cleaning, fuel pump diaphragm replacement, fuel line inspection, tank venting system check. Mixture ratio: 50:1 fuel to oil ratio required.

Cooling System

Thermostat replacement, water pump service, and overheating diagnosis.

Turn off engine and disconnect battery before service
Drain cooling system completely
Inspect water pump impeller for wear
Check thermostat operation and housing
Verify tell-tale water stream when running

Tip: Always run engine with water supply when testing cooling system on land.

Lower Unit

Gearcase service, propeller shaft repair, and seal replacement procedures.

Drain gear oil and inspect for water contamination
Remove propeller and inspect for damage
Check drive shaft splines for wear
Inspect water pump housing and impeller
Replace gearcase seals if leaking
Refill with recommended gear lubricant
Check shift mechanism operation
Verify proper gear engagement

WARNING! Always use marine gear lubricant and check for leaks after service.

Propeller & Drive

Propeller selection, installation, and drive system maintenance.

Care & Storage

Winterization procedures and long-term storage recommendations.

CAUTION! Always fog cylinders and stabilize fuel before storage. Store in upright position.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, or compression issue	Check fuel supply, spark plugs, and compression
Overheating	Water pump or thermostat failure	Inspect water pump impeller and thermostat
Poor performance	Carburetor or ignition timing	Clean carburetor and check timing
Electrical failure	Battery or charging system	Test battery voltage and stator output
Gearcase noise	Bearing or gear wear	Inspect gears and bearings for damage

Reset: Disconnect battery for 30 minutes to reset electrical system if needed.

Service: Contact authorized Chrysler marine dealer for technical support