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- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
Crankshaft Pulley Upgrade – Single-Belt Conversion with Air Conditioning
Upgrade the front-end accessory drive on your Porsche 964
with this OE Match Crankshaft Pulley Upgrade, designed for single-belt
conversion on Porsche 964 models equipped with air conditioning. This pulley is engineered to provide precise belt alignment, reliable accessory
drive performance and long service life.
Fits:
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
Diagram ref no 11
Early Porsche 964 models were equipped with a twin-belt drive arrangement for the cooling fan and ancillary components. Porsche later introduced the improved single-belt drive system, simplifying maintenance while improving belt alignment, reducing the number of service items and enhancing overall reliability. This upgraded crankshaft pulley is a key component in that conversion.
The crankshaft pulley is mounted directly to the front of the crankshaft and transfers engine rotation to the cooling fan, alternator and air conditioning compressor via the drive belt. Accurate machining and correct alignment are essential, as even slight pulley wear or distortion can lead to premature belt wear, belt noise and reduced charging or cooling efficiency.
This upgraded pulley provides excellent fitment and durability, making it the ideal replacement during engine rebuilds, front-end servicing or when converting to the later Porsche single-belt configuration.
Why Do Crankshaft Pulleys Fail?
Although manufactured from durable metal, crankshaft pulleys
are exposed to constant engine vibration, high rotational loads and repeated
thermal cycling throughout their service life. Over time they can suffer from:
- Worn or damaged belt grooves
- Corrosion from moisture and road contaminants
- Physical damage caused during previous servicing
- Belt misalignment due to impact or incorrect installation
- Excessive wear from running damaged or incorrectly tensioned belts
A worn pulley can accelerate belt wear, generate belt squeal, reduce charging efficiency and affect cooling fan performance. If ignored, severe wear can eventually lead to belt failure, potentially leaving the engine without adequate cooling or battery charging.
When Should the Crankshaft Pulley Be Replaced?
The crankshaft pulley should be carefully inspected whenever the drive belt is replaced or the front of the engine is dismantled.
Replacement is recommended if you notice:
- Worn or polished belt grooves
- Cracks or impact damage
- Corrosion affecting the belt contact surfaces
- Belt misalignment
- Persistent belt squeal despite correct belt tension
- During a single-belt conversion
- During engine rebuilds or major front-end servicing
Replacing the pulley during preventative maintenance helps ensure reliable belt operation and reduces the likelihood of future accessory drive problems.
Key Features
- Suitable for Porsche 964 single-belt conversion with air conditioning
- Precision-machined for accurate belt alignment
- Helps reduce belt wear and noise
- Supports reliable cooling fan, alternator and A/C operation
- Durable construction for long service life
- Ideal for engine rebuilds and preventative maintenance
Porsche 964 Engine Drive & Belt System Components
The accessory drive system on the Porsche 964 is critical to the operation of the engine cooling fan, alternator and air conditioning compressor. Maintaining these components in excellent condition is essential for dependable engine performance and long-term reliability.
The later single-belt conversion has become a popular upgrade for both road and restored vehicles, offering a simpler, more reliable drive arrangement with fewer components to maintain.
Replacing the crankshaft pulley as part of the conversion ensures the entire belt system operates with correct alignment and minimises unnecessary wear on new belts and associated components.
Benefits of the Single-Belt Conversion
Simplifies drive belt maintenance Improves belt alignment Reduces the number of wear components Enhances long-term reliability Minimises the likelihood of premature belt failure Ideal during engine rebuilds or front-end engine servicingRelated reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96410215020
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 914 (1970-1976)
Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 964 Turbo 3.3L 1991-92
Click 'Zoom in' for large parts diagram
Diagram ref no 15
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99909300502
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 1950-65
Porsche 912 1965-69
Click 'Zoom in' for large parts diagram.
Diagram ref no 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
61610216301
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits: Crankshaft Pulley End
Fits:
Porsche 356 1950-65
Porsche 912 1965-69
Speedi Sleeves to Repair Worn, Grooved Seal Surfaces
Over time, sealing surfaces will become grooved, making a good seal impossible.The most economical and fastest method of shaft repair is to install the CR Speedi Sleeve. Speedi Sleeve is a precision engineered piece of stainless steel. It's ultra-thin wall design allows it to be used without changing the sel size ans its finish is perfect for lip sealing applications. Speedi Sleeve is built with removable installation flange. The installation tool included in every box allows the seal to be put in. This avoids the possibility of distortion from heat or other installation methods.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110299189
The product you are viewing cross references to these numbers