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Belts / Tensioners / Rollers
By OE Match
- Porsche 928S2 4.7L 1984-86

Fits:
Porsche 928 1984-86
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919225050
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
Fits:
Porsche 928 1978-82
Click picture for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810557100
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Fits:
Porsche 928 1986-95
M28.41/50
Click 'Zoom in' for large parts diagram.
Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810557104
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95

Fits:
Porsche 928 S2 / S4 / GT / GTS 1983-95
Click 'Zoom in' for large parts diagram.
Diagram ref no 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810551212
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
This Power Steering Belt is an OE Match V-belt drive belt designed for Porsche 928 models equipped with power steering. It transfers power from the engine to the power steering pump.
Fits:
Porsche 928 1985 - 1995
for cars with power steering
Diagram ref no 20
The belt transmits rotational force from the engine to the power steering pump, enabling hydraulic pressure that assists steering. This reduces steering effort and improves control, especially at low speeds. Without a functioning belt, the power steering system will not operate correctly.
Function
• Drives the power steering pump via crankshaft pulley
• Maintains hydraulic pressure for assisted steering
• Ensures smooth and responsive steering operation
• Provides reliable power transmission under load
Over time, drive belts wear, stretch, or crack due to heat and continuous use. A worn belt can slip, reduce steering assistance, or fail completely -resulting in heavy steering and potential loss of control. Replacing the belt ensures consistent power delivery to the steering system and prevents unexpected failure.
When to replace
• Cracked, frayed, or glazed belt surface
• Squealing noise from engine bay
• Reduced or inconsistent power steering assistance
• Visible belt slack or wear
• During routine service or preventative maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919228650
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Cam Belt Tensioner Boot
High-quality replacement boot for the cam belt tensioner, designed for Porsche 928 models.
This component forms part of the tensioner assembly and
protects the internal mechanism from dirt, moisture, and debris. It is
essential for maintaining correct tensioner operation and ensuring long-term
reliability of the timing belt system.
Fits:
- Porsche 928S 4.7L 1983
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram ref no 23
Model years 1983-1986 - Please compare the
rolling diaphragm with your old part, as there are different versions
Technical Specifications
• Height: approx. 18mm
• Outer diameter: approx. 49mm
• Inner diameter: approx. 20mm
As part of routine maintenance, the tensioner should be serviced and the boot replaced every time the timing belt is changed, helping to prevent premature wear and potential engine damage.
This boot provides precise fitment and durability—ideal for both scheduled servicing and full engine maintenance.
Key Features
• Cam belt tensioner protective boot
• Essential for timing belt service
• Protects tensioner internals from contamination
• Maintains correct tensioner function
• OEM-style fit and performance
• Durable construction for long-term reliability
Function and Purpose
This boot is a critical protective component within the timing system.
It helps to:
• Seal and protect the tensioner mechanism
• Prevent ingress of dirt and moisture
• Maintain smooth tensioner operation
• Support correct timing belt tension
Why Replace the Tensioner Boot
The boot is subject to heat and ageing within the engine bay.
Common issues include:
• Cracking or splitting
• Loss of sealing capability
• Contamination of tensioner components
• Reduced tensioner performance
Replacing the boot during timing belt service helps ensure reliable engine operation and longevity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810555208
The product you are viewing cross references to these numbers
OEMatch Belts / Tensioners / Rollers — Fit, Function, Confidence
These belts, tensioners and rollers control engine timing and auxiliary drives on Porsche models and are commonly replaced during major services and engine rebuilds to restore precise operation and reduce the risk of future failures. Many owners search for genuine or OEM belts; OEMatch offers compatible alternatives engineered to match original-spec dimensions and tolerances for common Porsche applications.
- Timing belts and cambelts
- Auxiliary and serpentine belts
- Tensioner assemblies and hydraulic tensioners
- Idler and guide rollers
- Complete timing kits
Understanding OEMatch Belts / Tensioners / Rollers
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original belts, tensioners and rollers.
OE (Original Equipment) refers to parts matching original specifications for the belts, tensioners and rollers and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM belts, tensioners and rollers engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. OEMatch maintains a wide Porsche-focused catalogue and supports vehicle maintenance with thousands of cross-references and a continuing programme of new part development to help keep Porsche vehicles on the road.
Benefits Include
- Restored timing precision after rebuilds or major services
- Reduced risk of belt slip, noise and bearing failures
- Improved reliability for high-temperature and high-mileage applications
Why Belts / Tensioners / Rollers Wear and Fail
- Ageing rubber and heat exposure causing cracks or loss of flexibility
- Worn bearings in rollers or tensioners generating noise and vibration
- Loss of correct tension leading to slippage or timing misalignment
- Contamination from oil or coolant degrading belt materials
The Importance of Replacing with OEMatch Belts / Tensioners / Rollers
Replacing belts, tensioners and rollers during an engine rebuild or scheduled maintenance restores correct timing relationships, reduces the chance of catastrophic engine damage and supports long-term engine reliability on Porsche models. Using refreshed tensioners and rollers alongside new belts helps ensure even loading, quieter running and consistent operation across the rev range, protecting valves, pistons and ancillary drives.
Advantages
- Parts selected for Porsche applications and original-spec dimensions
- Complete kits available to simplify rebuilds and avoid mixing old and new components
- Options covering timing and auxiliary systems to match common service requirements