Volvo Penta AQ125A/AQ145A Workshop Manual
Documents Volvo Penta AQ125A/AQ145A service procedures from disassembly to assembly. Includes detailed technical data and repair instructions. Part number for this manual is 7739856-8.
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Volvo Models Covered & Key Technical Specifications
Models: AQ125A, AQ125B, AQ145A, AQ145B
Sub-models / Variants: 4-stroke overhead, sterndrive configurations, USA-execution variants
Technical Data:
- Engine type: 4-stroke overhead valve
- Number of cylinders: 4 in-line
- Compression ratio (AQ145A): 9.7:1
- Compression ratio (AQ125A): 9.3:1
- Displacement (AQ145A/B): 2.315 dm³ (141.271 cu.in.)
- Displacement (AQ125A): 2.127 dm³ (129.798 cu.in.)
- Maximum engine speed (AQ145A): 5500 r/m
- Maximum engine speed (AQ125A): 4800 r/m
- Cylinder bore (AQ145A/B): 96 mm
- Cylinder bore (AQ125A): 92 mm
- Stroke: 80 mm
- Compression pressure: 10–12 kp/cm²
Volvo Manual Features & Content Preview
Volvo Penta AQ125A, AQ125B, AQ145A, AQ145B Workshop Manual
- Covers 1998 Volvo Penta AQ125A/B and AQ145A/B 4-stroke overhead inboard engines, including US-execution and standard sterndrive variants
- Original OEM publication P/N 7739856-8, dated November 1998
- Includes detailed exploded-view illustrations, torque specification tables for critical fasteners, and comprehensive wiring diagrams for standard and US-market instrument panels
- File delivered as a direct download the moment payment clears
- Laid out for standard letter and A4 printing
- Full-text search finds any part number in seconds
- This 1998 OEM manual is the definitive reference for the AQ125/AQ145 engine series, detailing assembly, disassembly, and critical clearance tolerances for internal components
Engine Service Coverage
This workshop manual contains technical specifications, descriptions, and instructions for repairing the standard versions of the Volvo Penta AQ125A, AQ125B, AQ145A, and AQ145B engines. The manual displays the operations carried out on all versions above, noting that while illustrations show specific parts, the repair and service operations described are the same in all essential details. Content includes procedures for the cylinder head, valve train, crankshaft, pistons, lubrication system, and fuel system.
The document provides thorough sections on the cooling system, electrical systems, and specific carburetor tuning requirements. It also offers a detailed fault finding chart to assist in diagnostic evaluations for starting issues, overheating, and irregular running. For further information on what an OEM service publication covers, consult the structural definitions within this technical archive.
Technical Data and Specifications
This manual provides extensive calibration data, including torque values for vital joints like the cylinder head (90 Nm in two stages) and main bearing bolts (110 Nm). Piston clearance for the AQ145 series is listed at 0.05–0.07 mm, while the AQ125 series is documented at 0.01–0.03 mm. Crankshaft end float for the AQ145A is specified at 0.037–0.147 mm. Valve spring load data is provided at both 38 mm and 27 mm compressed lengths. Reference only — always consult a certified technician before performing service on this equipment.
An official 74-page Volvo Penta OEM workshop manual covering the 1998 AQ125A/B and AQ145A/B, documenting engine, chassis, electrical, and carburetor specifications for these 4-stroke overhead marine engine units.
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