Volvo Penta AQ131 | AQ151 | AQ171 Service Workshop Manual

Workshop Service and Repair Manual for the Volvo Penta AQ131, AQ151, AQ171  an absolute gem for any owner running a vintage Penta gas engine. This full workshop manual covers every component, service and repair procedure in full Volvo Penta factory specification with clear step by step photographs and technical drawings for all the 230,250,251 DOHC variants complete with values for both single and double overhead cams throughout, this is the most comprehensive service manual available as used by marine engineers and independent boatyards the world over.

Variants covered

230,250,251 DOHC
AQ131, AQ151, AQ171

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, 251 DOHC Alt.1
Wiring Diagram 251 DOHC Alt. 2
Renix Ignition System
Troubleshooting And Repair Ignition System 251 Dohc, AQ171

Engine:
Cylinder Head
Cylinder Block
Removing The External Components
Overhauling The Crank Assembly
Overhauling The Lubricating Oil Pump
Installing The External Components
Overhauling The Oil Cooler 250, 251 DOHC, AQ151, AQ171

Overhauling The Valve System:
Technical Description
Overhauling The Valve System 230,250, AQ131, AQ151
Adjusting The Valves 230, 250, AQ131, AQ151
Valve System 251 DOHC, AQ171.
Overhauling The Valve System 251 DOHC, AQ171
Installing The Toothed Belt 230, 250, AQ131, AQ151
Installing The Toothed Belt 251 DOHC, AQ171
Installing The External Components Of The Cylinder Head

Cooling System:
Overhauling The Heat Exchanger
Overhauling The Sea Water Pump
Checking The Thermostat