MERCURY MERCRUISER GM 4 CYLINDER 1985-1989 Service Manual

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🏷️ Basic Information Identification Make: Mercury MerCruiser Model: GM 4 Cylinder Marine Engines Year: 1985-1989 Generation: N/A 📋 Manual Details Description Manual Type: Workshop Repair Service Manual Manual Identifier: #10...

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Type: Marine Engine

Vendor:

Sku: 37915

Tags: 1985 1986 1987 1988 1989 GM 4 CYLINDER Inboard Engines Marine Marine Engine Mercury Mercury Mercruiser

Product variants

Description

🏷️ Basic Information

Identification

Make:

Mercury MerCruiser

Model:

GM 4 Cylinder Marine Engines

Year:

1985-1989

Generation:

📋 Manual Details

Description

Manual Type:

Workshop Repair Service Manual

Manual Identifier:

Language:

English

Format:

PDF Download

⚙️ Engine Specifications

General

Engine Family:

GM 4 Cylinder

Displacement

153 - 181

Liters:

2.5L - 3.0L

Models Covered

Model Codes:

MCM 120 MR, MCM 120 ALPHA I, MCM 2.5L, MCM 140 MR, MCM 140 ALPHA I, MCM 3.0L, SEA RAY 3.0L

Power Output

Horsepower Mcm 120:

120 HP

Horsepower Mcm 140:

140 HP (Later models 130 HP)

Horsepower Sea Ray 3 0L:

130 HP (Later models)

Compression Ratio

Mcm 140 Sea Ray 3 0L Later Models:

9.2:1

Notes

Mcm 2 5L Equivalence:

Same as MCM 120

Sea Ray 3 0L Equivalence:

Same as MCM 140 (Later Models)

🔧 Transmission

Drive Systems

Outdrive Types:

Alpha I, MR

🔧 Maintenance

Fluid Recommendations

Engine Oil Type:

Refer to manual for specific viscosity and type (e.g., SAE 25W-40 marine oil)

Engine Oil Capacity:

Refer to manual (typically 5 quarts / 4.7 liters for 3.0L)

Cooling System Type:

Closed cooling or raw water cooling (refer to specific model)

Service Intervals

Recommended Service Frequency:

Annually or every 100 hours of operation (whichever comes first, refer to manual)

Tune Up

Spark Plug Gap:

Refer to manual for specific engine configuration

Ignition Timing:

Refer to manual for specific engine configuration