Replacing multiple V-ribbed belts in Volkswagen – SKF instructions
Premature failure of the multiple V-ribbed belt is unfortunately a common problem that appears in many vehicles. Fortunately, the replacement is not very complicated. SKF gave its instructions using the example of a popular Volkswagen engine – 1.9 TDI.
Problems also do not bypass the Freewheel Alternator Pulley (FAP), whose poor condition is one of the main causes of multi-v belt tensioner failure. To minimize the risk of premature failure, SKF recommends replacing all components of the multi-v drive system at the same time, eliminating future warranty issues.
Note: Always follow the vehicle manufacturer’s recommendations when replacing the above components in the engine!
Tips for replacing multi-ribbed belts in VW 1.9 TDI engines
- Disconnect the accumulator and remove the fan from the viscous coupling. Loosen the A/C belt tensioner, then remove the multi-V belt and remove the tensioner.
- Carefully loosen the tensioner and belt using a 19 mm wrench. If you replace the FAP on the workbench, remove the engine cover.
3 Remove the belt along with the old tensioner.
4 Replace the multi-V belt tensioner VKM 31013, observing the manufacturer’s tightening torque recommendations (for more detailed instructions, see SKF Field Position bulletin no. 6 VKMA 31020).
5 Replace the A/C belt tensioner VKM 31059, observing the manufacturer’s recommendations for tightening torques.
At this stage, the mechanic can remove the alternator and replace the FAP pulley on the workbench, or depending on sufficient space, remove and replace it without removing the alternator.
Replacement without dismantling the alternator
Use the SKF tool set VKN 350:
Remove the old pulley:
Fit the new coupling VKM 03107 and tighten with 80 Nm torque. Replace the coupling cover, install a new VKMV 5PK1432 multi-ribbed belt.
Make two complete rotations of the system with the multi-V belt, checking that the belt is axially guided. Replace the crankshaft cap, install the VKMV 4PK855 A/C compressor drive belt, and adjust according to the vehicle manufacturer’s instructions.
Workbench replacement
Dismantle the alternator following the manufacturer’s instructions and clamp it in a vice with protective caps (take special care not to damage the alternator housing).
Use the SKF tool set VKN 350.
Remove the old pulley and replace with a new FAP VKM 03107. Tighten to a torque of 80 Nm.
Replace the cap, mount the alternator back to the engine, reverse the steps to removal. Then install a new VKMV 5PK1432 multi-ribbed belt.
Make two complete rotations of the system with the multi-V belt, checking that the belt is axially guided. Replace the crankshaft cap, install the VKMV 4PK855 A/C compressor drive belt, and adjust according to the vehicle manufacturer’s instructions.
