quired.
Tightening torques-protractor (angle)
tightening
In this Volvo Penta Service Manual the user will find
that each section where these agents are applied in
production states which type was used on the engine.
Tightening using both a torque setting
and a protractor angle requires that
first the recommended torque is ap-
plied using a torque wrench and then
the recommended angle is added ac-
cording to the protractor scale. Ex-
ample: a 90° protractor tightening
means that the joint is tightened a
further 1/4 turn in one operation after
the stated tightening torque has been
applied.
During service operations use the same agent or an
alternative from a different manufacturer.
Make sure that mating surfaces are dry and free from
oil, grease, paint and anti-corrosion agent before ap-
plying sealant or locking fluid. Always follow the man-
ufacturer’s instructions for use regarding; temperature
range, curing time and any other instructions for the
product.
Two different basic types of agent are used on the
engine and these are:
RTV agent (Room temperature vulcanizing). Use for
gaskets, sealing gasket joints or coating gaskets.
RTV agent is clearly visible when a component has
been dismantled; old RTV must be removed before
the joint is resealed. Old sealant can be removed us-
ing methylated spirits in all cases.
Locknuts
Do not re-use lock nuts that have been removed dur-
ing dismantling as they have reduced service life
when re-used - use new nuts when assembling or re-
installing. For lock nuts with a plastic insert such as
Anaerobic agents. These agents cure in an absence
of air. They are used when two solid parts, for ex-
ample cast components, are installed face-to-face
without a gasket. They are also commonly used to
secure plugs, threads in stud bolts, cocks, oil pres-
sure switches and so on. The cured material is glass-
like and it is therefore colored to make it visible.
Cured anaerobic agents are extremely resistant to
solvents and the old agent cannot be removed. When
reinstalling the part is carefully degreased and then
new sealant is applied.
Nylock
®
the tightening torque stated in the table is re-
duced if the Nylock nut has the same head height as
a standard hexagonal nut without plastic insert. Re-
duce the tightening torque by 25% for bolt size 8 mm
®
or larger. Where Nylock nuts are higher, or of the
same height as a standard hexagonal nut, the tighten-
ing torques given in the table apply.
®
Tolerance classes
Screws and nuts are divided into different strength
classes, the class is indicated by the number on the
bolt head. A high number indicates stronger material,
for example a bolt marked 10-9 indicates a higher tol-
erance than one marked 8-8. It is therefore important
that bolts removed during the disassembly of a bolted
joint must be reinstalled in their original position when
assembling the joint. If a bolt must be replaced check
in the replacement parts catalogue to make sure the
correct bolt is used.
Sealants
A number of sealants and locking liquids are used on
the engines. The agents have varying properties and
are used for different types of jointing strengths, oper-
ating temperature ranges, resistance to oil and other
chemicals and for the different materials and gap
sizes in the engines.
To ensure service work is correctly carried out it is
important that the correct sealant and locking fluid
type is used on the joint where the agents are re-
7
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD11C, Volvo Penta MD11D, Volvo Penta MD17C, Volvo Penta MD17D |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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