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- 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)
Shim washer for alternator belt pulley 0.5mm for Porsche 911 models, used to fine-tune alternator belt alignment and tension across classic 911 applications from 1965–1989.
What This Product Does
This 0.5mm shim washer sits between the alternator belt pulley halves to adjust pulley spacing, helping to achieve correct belt tension and alignment. Using the appropriate number of shims supports smooth belt operation and reduces the risk of premature belt wear.
Functions
- Spaces the alternator pulley halves to achieve correct belt tension
- Helps align the alternator belt with adjacent pulleys
- Allows fine tolerance adjustment in 0.5mm steps
- Contributes to stable alternator and cooling fan drive
Symptoms of Fault
- Squealing or chirping from the alternator belt area on start-up or under load
- Visible belt slack or difficulty setting correct belt tension
- Uneven belt wear or fraying at the pulley edges
- Traces of belt dust around the alternator and pulley
- Intermittent charging issues linked to belt slip
- Overheating risk on engines where the belt also drives the cooling fan
Why Replacement Matters
Alternator and fan belt systems on classic Porsche 911 models rely on a stack of correctly sized shims to set belt tension within specified tolerances. Missing, damaged, or incorrect shims can make precise adjustment difficult, leading to belt slip, noise, and accelerated wear. Replacing worn or lost shim washers when servicing the belt or pulleys helps restore proper alignment and tension control, supporting reliable charging and cooling operation on older 911 engines.
Fits
- Porsche 911 & 912 (1965–1989)
- Porsche 911 1974–1977 2.7L / 1976–1977 3.0 Carrera
- Porsche 911 1975–1977 3.0L Turbo (930)
- Porsche 911 1978–1983 3.0L SC
- Porsche 911 1984–1986 3.2L
- Porsche 911 1987–1989 3.2L G50
FAQs
- Q: How many shims should be used?
A: Follow the Porsche workshop manual for your specific model. The total number of shims is usually fixed, with the split between in-use and parked shims determining belt tension. - Q: Where are the spare shims stored?
A: Typically, unused shims are kept under the pulley nut or outer pulley half so they remain available for future adjustment. - Q: When should shims be renewed?
A: Replace shims that are bent, corroded, damaged, or missing when changing the alternator belt or pulley components, to ensure accurate tolerance adjustment.
Support & Advice
Ensure you use the correct combination of shims to bring the belt tension within the recommended tolerances for your engine. Always confirm fitment against your vehicle details (model, year, engine) before installation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9301065640Y
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fits:
Porsche 964 1990-94
Click 'Zoom in' for large parts diagram.
Diagram Ref No 17.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96414718703
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
FAN Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Or Tiptronic Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Or Tiptronic Transmission
Diagram Ref No 13
OR
ALTERNATOR Belt
Porsche 964 Carrera 1989>>1994 Cars With Manual Transmission
Porsche 993 Carrera 1994>>1997 Cars With Manual Transmission
Diagram Ref No 14
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919233851
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Belt size 9.5 x 760
ALTERNATOR Belt
Porsche 964 1989-94 Cars with Tiptronic transmission
Porsche 993 1994-98 Cars with Tiptronic transmission
Diagram Ref No 14.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919234351
The product you are viewing cross references to these numbers