7TS 500i
2.5 Tightening torquese
P and DG screws are fitted in plastic and light alloy metal parts. These screws form a permanent thread when
they are installed for the first time. The material is permanently deformed. Screws can be removed and installed
as often as necessary without impairing the strength of the screwed assembly, provided that the specified
tightening torque is observed.
For this reason it is essential to use a torque wrench.
When inserting DG and P screws into an existing screw thread:
Insert the DG or P screw in the hole and turn counterclockwise until it gently drops into the hole in axial direction
and engages the existing threads. Tighten the screw clockwise to the specified torque.
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread
and weaken the assembly.
For the microencapsulated screw, before renewed assembly, clean both threads (insert tap in the internal thread
by hand and then blow out the threaded hole, brush off the exterior thread), coat the cleaned screw with
medium-strength Loctite 242 or 243.
Screwdriver speed when used in plastic material: P and DG screws max. 500 rpm.
Do not use an impact wrench to release or tighten screw connections.
Screws with and without locking serration must not be confused.
Fastener Thread size For component Tightening
torques
Comment
Nm
Screw P4x16 Limit stop / cast arm 1.8
Screw M8 Stop pin / cast arm 5.0
Screw M6x28 Cast arm / flange 8.0 2)
Collar nut M8 Cast arm / rewind starter / stud 20.0
Screw M5x17 Cover / shroud (service cover) 4.5
Screw P6x19 Cap / solenoid valve / tank housing 6.0
M10x1 Decompression valve 14.0
Screw M4x20 Injection valve / crankcase 3.0 2)
Screw M5x20 Filter cover / tank housing 6.0
Screw M4x9.6 Spark arresting screen / muffler 2.0
Screw M5x20 Generator / crankcase 6.0 2)
Screw P5x16 Handle molding / shroud 4.0
Screw D5x20 Rubber buffers / support 6.0 6)
Screw P5x16 Holder / switch / shroud 4.0
Screw P6x19 Shroud / tank housing 6.0
To Next Page
Loading...
