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General information
About the workshop manual
This workshop manual contains technical specifica-
tion, 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 corre-
spondence about the product.
This Workshop Manual has been developed primarily
for Volvo Penta service workshops and qualified per-
sonnel. 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 prod-
ucts. 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 in-
troduced into production or updated or revised ser-
vice 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 Vol-
vo Penta.
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