This workshop service manual is for the VOLVO PENTA 230 250 251 AQ131 AQ151 AQ171 engine. It covers a 4-cylinder 4-stroke overhead cam engine.
The manual includes:
Safety Precautions
General information
Repair instructions
Presentation
Trouble-shooting Scheme
Overhaul Data
Special Tools
Electrical System
Wiring Diagram AQ131, AQ151, 230, 250 Alt. 1
Wiring Diagram 230, 250 Alt. 2
Wiring Diagram AQ171, 251DOHC Alt.1
Wiring Diagram 251DOHC Alt. 2
Fuel System
Trouble shooting and Remedies Fuel System
Overhauling and checking the carburetor
Trouble-shooting and repair ignition system 251DOHC, AQ171 38
Cylinder Head
Removal of the external components
Cooling System
Overhauling the heat exchanger
Overhauling the sea water pump
Check the thermostat
Overhauling the valve system
Adjusting the valves
Valve system 251DOHC, AQ171. Technical Description
Overhauling the valve system 251DOHC, AQ171
Installing the toothed belt
Installing the external components of the Cylinder Head
Cylinder Block
Removing the external components
Overhauling the Crank Assembly
The lubricating oil pump Overhauling
Installing the external components
Overhauling the oil cooler 250, 251DOHC, AQ151, AQ171
This comprehensive manual is available in .PDF format and features detailed exploded views. It provides step-by-step written procedures with pictures and diagrams, making it suitable for professional mechanics and DIY enthusiasts. The manual is fully printable, with over 100 pages of illustrations and detailed instructions for repairs and servicing.
