Engine Component Torque Specifications (Critical Fasteners); Fastener Reuse - Volvo EPA2007 D13F Reference Manual

Engine Component Torque Specifications (Critical
Fasteners)
Note: All components are to be clean and free from foreign material or corrosion.
Assemblies are to be made using suitable tools and procedures so that no permanent
damage will occur as a result of the assembly.
Threads, washers, under head of screws and washer face of nuts should be lubricated
with clean engine oil unless otherwise specified.
The following listed fasteners require the use of a calibrated manual torque wrench. If
an adapter is required in combination with a torque wrench, a correction factor must be
applied to the torque wrench reading in order to obtain accurate fastener torque values.
Fasteners noted by an asterisk (*) require retorque after engine run-in.

Fastener Reuse

CAUTION
Repeated tightening of fasteners and threaded components reduces their capacity
to function adequately. The following table describes the various items and the
limits of their reusability. Failue to conform to these limits may result in severe
component damage.
Fastener Reuse
Fssteners
Highly
loaded screws
(Phosphating plus
oil)
Highly
loaded screws
(Phosphating plus
oil)
Special screws
(specific shape)
Example Reusable
Limit
Cylinder 5 times
Head
Injector
yoke
Camshaft
Bearing
Housing
Transmission
Flywheel
Connect- 5 times
ing rods
for D13F
engines
Oil pan No limit
and valve
cover
SPECIFICATIONS 47
Reusable Recommendation
Apply engine oil on threads and
under screw heads.
Mark bolt head with an indentation.
Dry mounting for new screws
(delivered with oil pre-applied and
anti-rust treatment for spare parts).
If a part is replaced, e.g., cylinder
head, also replace the screws.
Apply Molykote grease
"G-Rapid+MoS2" (spray).
No limit if no cracks, corrosion or
damage to the flat surface.