Repair Methods; Our Joint Responsibility; Tightening Torques - Volvo Penta MD6A Workshop Manual

Repair methods

The working methods described in the Service
Manual apply to work carried out in a workshop. The
engine has been removed from the boat and is
installed in an engine fixture. Unless otherwise stated
reconditioning work which can be carried out with the
engine in place follows the same working method.
Warning symbols occurring in the Workshop Manual
(for their meaning see Safety in formation)
WARNING!
IMPORTANT!
NOTE!
are not in any way comprehensive since it is impossi-
ble to predict every circumstance under which
service work or repairs may be carried out. For this
reason we can only highlight the risks that can arise
when work is carried out incorrectly in a well-
equipped workshop using working methods and tools
developed by us.
All procedures for which there are Volvo Penta spe-
cial tools in this Workshop Manual are carried out us-
ing these. Special tools are developed to rationalize
working methods and make procedures as safe as
possible. It is therefore the responsibility of any per-
son using tools or working methods other than the
ones recommended by us to ensure that there is no
danger of injury, damage or malfunction resulting
from these.
In some cases there may be special safety precau-
tions and instructions for the use of tools and chemi-
cals contained in this Workshop Manual. These spe-
cial instructions should always be followed if there
are no separate instructions in the Workshop
Manual.
Certain elementary precautions and common sense
can prevent most risks arising. A clean workplace
and engine eliminates much of the danger of injury
and malfunction.
It is of the greatest importance that no dirt or foreign
particles get into the fuel system, lubrication system,
intake system, turbocharger, bearings and seals
when they are being worked on. The result can be
malfunction or a shorter operational life.

Our joint responsibility

Each engine consists of many connected systems
and components. If a component deviates from its
technical specification the environmental impact of
an otherwise good engine may be increased
significantly. It is therefore vital that wear tolerances
are maintained, that systems that can be adjusted
are adjusted properly and that Volvo Penta Genuine
Parts as used. The engine Maintenance Schedule
must be followed.
Some systems, such as the components in the fuel
system, require special expertise and special testing
equipment for service and maintenance. Some com-
ponents are sealed at the factory for environmental
reasons. No work should be carried out on sealed
components except by authorized personnel.
Bear in mind that most chemicals used on boats are
harmful to the environment if used incorrectly. Volvo
Penta recommends the use of biodegradable de-
greasing agents for cleaning engine components, un-
less otherwise stated in a workshop manual. Take
special care when working on-board, that oil and
waste is taken for destruction and is not accidentally
pumped into the environment with bilge water.

Tightening torques

Tightening torques for vital joints that must be tight-
ened with a torque wrench are listed in workshop
manual 'Technical Data": "Tightening Torques" and
are contained in work descriptions in this Manual. All
torques apply for cleaned threads, screw heads and
mating surfaces. Torques apply for lightly oiled or dry
threads. If lubricants, locking fluid or sealing com-
pound are required for a screwed joint this
information will be contained in the work description
and in "Tightening Torques' Where no tightening
torque is stated for a joint use the general tightening
torques according to the tables below. The tightening
torques stated are a guide and the joint does not
have to be tightened using a torque wrench.
Dimension
M5
M6
M8
M10
M12
M14
6
Tightening Torques
Nm lbt.ft
6 4,4
10 7,4
25 18,4
50 36,9
80 59,0
140 103,3