Volvo Penta 230 250 251DOHC AQ131 151 171 Engine Workshop Manual_427065166 PDF

Volvo Penta 230 250 251DOHC AQ131 151 171 Engine Workshop Manual_427065166 – PDF DOWNLOAD

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Volvo Penta 230 250 251DOHC AQ131 151 171 Engine Workshop Manual_427065166 – PDF DOWNLOAD

Language : English
Pages : 102
Downloadable : Yes
File Type : PDF
Size: 84.4 MB

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DESCRIPTION:

Volvo Penta 230 250 251DOHC AQ131 151 171 Engine Workshop Manual_427065166 – PDF DOWNLOAD

General information:
About the workshop manual:

This workshop manual contains technical specification, descriptions and instructions for repairing the standard versions of the following engines 230, 250, 251DOHC, AQ131, AQ151 and AQ171. The product designation and number should be given in all correspondence about the product.

• This Workshop Manual has been developed primarily for Volvo Penta service workshops and qualified personnel. Persons using this book are assumed to have a grounding in marine drive systems and be able to carry out related mechanical and electrical work. Volvo Penta is continuously developing their products.
• We therefore reserve the right to make changes. All the information contained in this book is based on product data available at the time of going to print.
• Any essential changes or modifications introduced into production or updated or revised service methods introduced after the date of publication will be provided in the form of Service Bulletins.

Replacement parts:

Replacement parts for electrical and fuel systems are subject to statutory requirements (US Coast Guard Safety Regulations for example). Volvo Penta Genuine parts meet these requirements. Any type of damage which results from the use of non-original Volvo Penta replacement parts for the product will not be covered under any warranty provided by Volvo Penta.

TABLE OF CONTENTS:

Volvo Penta 230 250 251DOHC AQ131 151 171 Engine Workshop Manual_427065166 – PDF DOWNLOAD

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