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Start ShoppingCOMETIC C9499F Panhead/Shovelhead Transmission Gasket - Oil-Resistant Gasket for Harley 4-Speed Transmissions
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Description
Keep your Harley-Davidson Panhead or Shovelhead running smoothly with this high-performance transmission gasket. Designed to seal 4-speed transmissions and prevent costly gear oil leaks, this Cometic gasket combines durability with precision engineering for long-lasting reliability.
Key Features
- Advanced Fiber/Composite Material: Compressible and oil-resistant construction ensures a perfect seal under pressure while resisting degradation from engine fluids.
- Exact Fit for Harley 4-Speed Cases: Precisely molded to match Panhead/Shovelhead case patterns for seamless installation and optimal performance.
- Single Gasket Design: Sold individually for targeted replacement, eliminating the need for full engine/transmission gasket kits.
Why Choose This Product
Upgrade your transmission sealing system with a gasket engineered for Harley-Davidson classics. This Cometic product offers superior leak prevention, easy installation, and compatibility with original equipment specifications. Its durable material resists oil breakdown and maintains integrity through thousands of miles of riding, making it a trusted choice for motorcycle enthusiasts and mechanics alike.
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Keep your Harley-Davidson Panhead or Shovelhead running smoothly with this high-performance transmission gasket. Designed to seal 4-speed transmissions and prevent costly gear oil leaks, this Cometic gasket combines durability with precision engineering for long-lasting reliability.
Key Features
- Advanced Fiber/Composite Material: Compressible and oil-resistant construction ensures a perfect seal under pressure while resisting degradation from engine fluids.
- Exact Fit for Harley 4-Speed Cases: Precisely molded to match Panhead/Shovelhead case patterns for seamless installation and optimal performance.
- Single Gasket Design: Sold individually for targeted replacement, eliminating the need for full engine/transmission gasket kits.
Why Choose This Product
Upgrade your transmission sealing system with a gasket engineered for Harley-Davidson classics. This Cometic product offers superior leak prevention, easy installation, and compatibility with original equipment specifications. Its durable material resists oil breakdown and maintains integrity through thousands of miles of riding, making it a trusted choice for motorcycle enthusiasts and mechanics alike.
| SKU | GM7733EF52 |
|---|---|
| MPN | C9499F |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Big Twin Panhead | 1948-1965 |
| Harley-Davidson | Big Twin Shovelhead | 1966-1984 |
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- basic SAE hand tools (wrenches/sockets appropriate for Harley 4‑speed cover hardware)
- torque wrench (inch‑lb or ft‑lb depending on fasteners)
- gasket scraper or plastic razor blade
- brake cleaner or suitable degreaser
- lint‑free rags
Pro Tips
- Clean both mating surfaces completely; remove all traces of the old gasket and sealant without gouging the aluminum or steel.
- Dry‑fit the gasket to the cover/case to ensure bolt holes align correctly before applying any sealant (if used).
- If using sealant, apply only a very thin film around the perimeter and bolt holes; many builders run quality fiber gaskets dry or with a light gasket dressing instead of heavy RTV.
- Tighten bolts in a criss‑cross pattern to the factory torque spec to avoid warping the cover and ensure even compression.
- Allow any sealant used to cure as directed before filling and riding, especially on high‑heat or long‑distance use.
Common Mistakes to Avoid
- Reusing old or damaged gasket surfaces without proper cleaning, leading to leaks.
- Over‑tightening cover bolts and crushing or splitting the gasket.
- Failing to check and clean both mating surfaces for gouges, old gasket material, or sealant.
- Using excessive RTV/silicone that can squeeze into the case and contaminate the transmission.
- Not checking transmission oil level after reassembly.
Comparison vs Stock/OEM
Functionally equivalent to OEM-style fiber transmission cover gasket for Panhead/Shovelhead 4‑speed applications, with aftermarket Cometic material quality and consistency.
Improvements
- High‑quality aftermarket gasket material designed for oil resistance and stable compression.
- Often more readily available than obsolete OEM Harley part numbers for vintage models.
- Manufactured to consistent thickness and cut accuracy, improving sealing performance on older, slightly imperfect surfaces.
Considerations
- Not an OEM Harley‑Davidson branded part; riders doing concours restorations may prefer OEM‑stamped packaging where available.
- Proper surface prep and torque procedure are more critical on older engines than minor differences between OEM and quality aftermarket gaskets.
Durability & Warranty
Expected Lifespan
Typically lasts many years when installed on clean, flat mating surfaces and not repeatedly removed; often replaced only when the cover is removed or if a leak develops.
Warranty
Standard aftermarket gasket warranty from Cometic (usually limited warranty against manufacturing defects; details depend on point of purchase).
Maintenance
Periodically inspect for seepage around the transmission cover during routine service. Check and maintain correct transmission fluid level to avoid overheating and pressure that can stress gaskets.
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