Timing belt tensioning tool. Porsche 928 / 928 S  ›  99131

Drive belt tensioner (Hydraulic Portion).
The Genuine Porsche Drive Belt Tensioner (Part No. 94810226121) is used in Porsche Cayenne (92A) and Panamera (970) models. This tensioner maintains proper tension and alignment of the serpentine (ribbed) belt, ensuring the alternator, air-conditioning compressor, power steering pump and other accessories function smoothly.

Fits:
Porsche 958 Cayenne S / GTS / Turbo 4.8L 2011 - 2018
Porsche 970 Panamera 3.6L 2011 - 2016
Porsche 970 Panamera S / GTS / Turbo 4.8L 2010 - 2016

Diagram ref no 3

The belt tensioner plays a critical role in the accessory-drive system: a failing or loose tensioner can allow belt slippage, mis-routing, increased accessory wear or belt breakage. This has implications for alternator output, A/C performance, power steering function and overall engine reliability. By using the genuine Porsche tensioner, you protect the accessory system, maintain factory behaviour and avoid secondary damage.

When to replace:
 • Audible belt squeal, chirp or rumble when the engine is started or under load.
 • Belt shows signs of wear, mis-tracking or vibration.
 • Tensioner or pulley appears worn, loose or has excessive play.
 • During serpentine belt replacement or major engine service where access is available.
 • High-mileage vehicles where the original tensioner may be nearing end of service life.

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Related, superseded, cross reference or alternative numbers for comparison.

94810226121

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Belt deflection roller with fastening screw and protection cap.



Fits:
Porsche 957 Cayenne S / GTS / Turbo 2007-10
Porsche 958 Cayenne S / GTS / Turbo 2011>>
Porsche 970 Panamera / S GTS / Turbo 2010-16

Click 'Zoom in' for large parts diagram.
Diagram ref no 7

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Related, superseded, cross reference or alternative numbers for comparison.

94810211821

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Drive Belt Deflection Roller

OE Match drive belt deflection roller for selected Porsche 957 and 958 Cayenne and 970 Panamera models.

Fits:

• Porsche 957 Cayenne S / GTS 4.8L 2007-10
• Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
• Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
• Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
• Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
• Porsche 970.1 Panamera S V8 4.8L 2009-13
• Porsche 970.1 Panamera 4S V8 4.8L 2009-13
• Porsche 970.1 Panamera GTS V8 4.8L 2011-13
• Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
• Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
• Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
• Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
• Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
• Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
• Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
• Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
• Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
• Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
• Porsche 970.2 Panamera Turbo V8 Executive 2014-16
• Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16

Diagram ref no 6

The deflection roller forms part of the engine's auxiliary drive belt system, guiding the belt along its correct path and helping maintain stable belt operation as it drives associated engine accessories.

What Does the Drive Belt Deflection Roller Do?

The deflection roller, sometimes referred to as an idler pulley, guides the auxiliary drive belt around the engine's belt-driven components.

Its internal bearing allows the roller to rotate freely while keeping the belt correctly routed. Smooth roller operation is important for reducing unwanted belt movement, vibration and noise.

Why Does It Fail?

The roller rotates whenever the engine is running, meaning its internal bearing is subject to continual speed, heat and mechanical loading.

Common causes of deterioration include:

Bearing wear Loss of bearing lubrication Contamination from dirt or fluids Excessive belt tension Misalignment Damaged pulley running surface High mileage and general age-related wear

As the bearing deteriorates, the roller may become noisy, develop excessive play or stop rotating smoothly.

When Should It Be Replaced?

Consider replacement if there is:

Squeaking, chirping or grinding from the belt area Roughness when the pulley is rotated by hand Excessive bearing play Visible pulley damage Irregular belt movement Repeated auxiliary belt problems

The deflection roller should also be inspected whenever the drive belt or belt tensioner is replaced.

Checks During Replacement

When replacing the deflection roller, also inspect:

Auxiliary drive belt Drive belt tensioner Other idler and deflection rollers Pulley alignment Belt running surfaces Accessory pulleys Signs of oil or coolant contamination

Replacing a worn roller before it seizes can help prevent damage to the auxiliary drive belt and associated components.

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

95814527601

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