Drive belt tensioner lever & pulley. Porsche 991 / Boxster / Cayman  ❭  0PB903308KIT

Drive belt tensioner lever & pulley, 
Includes belt tensioner pulley with NTN bearing
This OE Match drive belt tensioner lever and pulley kit is a replacement accessory belt tensioning kit for selected Porsche 991, Boxster, and Cayman models. It is designed to maintain the correct tension on the auxiliary drive belt, helping the belt run smoothly across the engine pulleys.

Fits:
Porsche 987.2 Boxster 2009 - 2012
Porsche 981 Boxster 2012 - 2016
Porsche 981 Boxster Spyder 2016
Porsche 982 (718) Boxster 2017>>
Porsche 987C.2 Cayman 2009 - 2012
Porsche 981C Cayman 2012 - 2016
Porsche 981C Cayman GT4 2016
Porsche 982C (718C) Cayman 2017>>
Porsche 991.1 Carrera 2012 - 2016
Porsche 991.2 Carrera 2017 - 2018
Porsche 991 Turbo / GT2 2014 0 20-18
Porsche 991 GT3 2014 - 2018

Diagram ref no 19

The drive belt tensioner lever and pulley assembly keeps the auxiliary belt under the correct operating tension. This allows the belt to reliably drive engine accessories such as the alternator, water pump, air conditioning compressor, and other belt-driven components depending on model specification.

Functions:
•  Maintains correct auxiliary drive belt tension
•  Guides the drive belt smoothly over the pulley system
•  Helps prevent belt slip, squeal, or misalignment
•  Supports reliable operation of belt-driven engine accessories
•  Reduces vibration and uneven belt movement
•  Helps protect the belt from premature wear
•  OE Match replacement kit for worn tensioner lever and pulley components

Why Replace This Part?
The tensioner lever and pulley are exposed to constant rotation, heat, vibration, and belt load. Over time, the pulley bearing can wear, the lever mechanism can weaken, and the tensioner may no longer hold the belt correctly. A worn tensioner or pulley can cause belt noise, slipping, charging problems, cooling issues, or accessory drive failure. Replacing the kit helps restore reliable belt tension and protects the auxiliary drive system.

When to replace
•  The auxiliary drive belt is slipping, squealing, or jumping
•  There is noise from the pulley bearing or tensioner area
•  The pulley has play, roughness, wobble, or visible damage
•  The tensioner no longer holds correct belt tension
•  The belt shows uneven wear, cracking, or glazing
•  The alternator, water pump, or air conditioning drive is affected
•  The drive belt is being replaced as part of major service
•  During engine accessory drive repair or preventative maintenance.

Where it fits on the car
This kit fits on the engine accessory drive system, where it tensions and guides the auxiliary drive belt. It is mounted at the drive belt tensioner position on the front/side of the engine, depending on the model and engine layout.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB903308KIT

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