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VOLVO PENTA 230 250 251 AQ131 AQ151 AQ171 WORKSHOP MANUAL

VOLVO PENTA 230 250 251 AQ131 AQ151 AQ171 WORKSHOP MANUAL

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VOLVO PENTA 230 250 251DOHC AQ131 AQ151 AQ171 WORKSHOP FACTORY REPAIR SERVICE MANUAL 

230, 250, 251DOHC 
AQ131, AQ151, AQ171 

This Workshop Manual contains technical data, descriptions 
and repair instructions for Volvo Penta products 
or product versions contained in the contents list. 

Safety Precautions .............................................................................. 2 
General information ............................................................................ 5 
Repair instructions ............................................................................. 6 
Presentation ........................................................................................ 8 
Trouble-shooting Scheme ..................................................................11 
1. Overhaul Data ...............................................................................12 
2. Special Tools ................................................................................20 
3. Electrical System .........................................................................23 
Wiring Diagram AQ131, AQ151, 230, 250 Alt. 1. ........................24 
Wiring Diagram 230, 250 Alt. 2 ..................................................26 
Wiring Diagram AQ171, 251DOHC Alt.1. ..................................28 
Wiring Diagram 251DOHC Alt. 2 ...............................................30 
4A. Fuel System ..................................................................................32 
Trouble shooting and Remedies Fuel System ............................32 
Overhauling and checking the carburetor ...................................33 
4B. Renix Ignition System..................................................................38 
Trouble-shooting and repair ignition system 251DOHC, AQ171 38 
4C. Cylinder Head ...............................................................................44 
Removal of teh external components .........................................44 
4D. Cooling System ............................................................................48 
Overhauling the heat exchanger .................................................48 
Overhauling the sea water pump ................................................49 
Check the thermostat..................................................................49 
4E. Overhauling the valve system .....................................................50 
Overhauling the valve system 230, 250, AQ131, AQ151 ...........50 
Adjusting the valves 230, 250, AQ131, AQ151 ..........................59 
Valve system 251DOHC, AQ171. Technical Description ...........61 
Overhauling the valve system 251DOHC, AQ171 ......................63 
4F. Installing the toothed belt ...........................................................71 
Installing the toothed belt 230, 250, AQ131, AQ151 ......................71 
Installing the toothed belt 251DOHC, AQ171.................................73 
4G. Installing the external components of the Cylinder Head ........74 
5. Cylinder Block ..............................................................................78 
5A. Removing the external components ...........................................78 
5B. Overhauling the Crank Assembly ...............................................80 
The lubricating oil pump Overhauling..........................................87 
5C. Installing the external components ............................................93 
Overhauling the oil cooler 250, 251DOHC, AQ151, AQ171 ........95 
Workshop Manual Disclaimer: The item is either in the public domain, we own resale rights to it, or we are the publishers and sole copyright holders. No trademarks, copyrights, or laws have been violated in this product listing. This product fully conforms to Laws and international media policy. This service manual is in no way affiliated with or sponsored by any of the manufacturers listed in this auction unless specifically noted. The logos and the marks of the manufacturers are registered trademarks of their respective owners. The use of various names and their model names, descriptions and/or numbers are used in applications and descriptions for reference purposes only. Their use in no way denotes or infers a direct connection with this service manual and any vehicle manufacturer or their authorized agencies. Use of various companies’ names and product lines on this website exists only for descriptive and informational purposes and does not infer any direct connection between this service manual and these companies.
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