Volvo 2003T Manual de Serviço descarregar pdf (Página 9)

General instructions

Strength classes

Bolts and nuts are divided up into different classes of

strength; 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

strength 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.

Sealant

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 siz-

es in the engines.

To ensure service work is correctly carried out it is im-

portant that the correct sealant and locking fluid type

is used on the joint where the agents are required.

In this Volvo Penta Workshop 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. Exam-

ple: 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.

Tightening torque with Protractor tight-

ening (angle tightening)

Lock nuts

Do not re-use lock nuts that have been removed dur-

ing dissassembly operations as these have reduced

service life when re-used - use new nuts when assem-

bling or reinstalling. For lock nuts with a plastic insert

such as Nylock® the tightening torque stated in the

table is reduced if the Nylock® nut has the same

head height as a standard hexagonal nut without plas-

tic insert. Reduce 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 tightening torques given in the table apply.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 47 48

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