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Start ShoppingCometic C9152F1 Twin Cam Derby Cover Gasket - Reusable Inspection Cover Gasket for Harley-Davidson Engines
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Description
Ensure optimal engine performance with Cometic's premium Twin Cam Derby Cover Gasket (C9152F1). This reusable gasket provides superior sealing for Harley-Davidson Twin Cam engines while maintaining durability through repeated installations.
Key Features
- Proprietary Material: Cometic's specialized fiber/foam compound resists compression set and maintains sealing integrity under high temperatures.
- Reusable Design: Engineered for multiple removal/installation cycles without compromising performance or seal quality.
- Engine Compatibility: Precision-fit for Harley-Davidson Twin Cam engines' primary derby/inspection covers.
- USA-Made Quality: Manufactured in the United States for consistent quality and performance standards.
Why Choose This Product
Upgrade your engine maintenance with a gasket that combines durability with reusability. Cometic's advanced material technology reduces the risk of leaks and ensures reliable sealing, making it ideal for riders who frequently service their Twin Cam engines. The reusable design saves costs over time while maintaining factory-level performance. As a USA-made product, it meets rigorous quality standards for both street and performance applications.
SKU:
GM0E2F1501
MPN:
C9152F1
UPC:
191070004682
Category:
Gaskets/Seals
Brand:
Cometic
Stock:
In Stock
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Ensure optimal engine performance with Cometic's premium Twin Cam Derby Cover Gasket (C9152F1). This reusable gasket provides superior sealing for Harley-Davidson Twin Cam engines while maintaining durability through repeated installations.
Key Features
- Proprietary Material: Cometic's specialized fiber/foam compound resists compression set and maintains sealing integrity under high temperatures.
- Reusable Design: Engineered for multiple removal/installation cycles without compromising performance or seal quality.
- Engine Compatibility: Precision-fit for Harley-Davidson Twin Cam engines' primary derby/inspection covers.
- USA-Made Quality: Manufactured in the United States for consistent quality and performance standards.
Why Choose This Product
Upgrade your engine maintenance with a gasket that combines durability with reusability. Cometic's advanced material technology reduces the risk of leaks and ensures reliable sealing, making it ideal for riders who frequently service their Twin Cam engines. The reusable design saves costs over time while maintaining factory-level performance. As a USA-made product, it meets rigorous quality standards for both street and performance applications.| SKU | GM0E2F1501 |
|---|---|
| MPN | C9152F1 |
| UPC/GTIN | 191070004682 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Frequently Asked Questions
Yes, this part is marketed by Cometic and distributors as a reusable derby/inspection cover gasket. It is designed to maintain its shape and sealing capability through multiple cover removals when properly installed and not damaged.
No, you should install the Cometic C9152F1 dry on clean mating surfaces. Additional RTV or sealant is not recommended and can cause leaks or contamination inside the primary.
No, it is designed to seal between flat, undamaged surfaces. If the derby or primary cover is warped, cracked, or gouged, those parts should be repaired or replaced; a gasket alone will not permanently fix those issues.
As long as the aftermarket derby/inspection cover uses the same OEM gasket shape and bolt pattern as the Harley‑Davidson Twin Cam primary cover this gasket is designed for, it will typically fit. Always check with the cover manufacturer and compare gasket shape/bolt pattern before ordering.
Usually you do not have to fully drain the primary; most Twin Cam primaries can have the derby cover removed with the bike level and only minor fluid seepage. However, if the fluid level is high or the bike is leaned significantly, more oil may spill, so many technicians replace the gasket at the same time as a scheduled primary service and drain the primary first.
Installation Guide
Difficulty
Easy
Est. Time
20 min
Tools Required
- Allen/hex or Torx drivers (size depends on your derby/inspection cover hardware, common sizes: T27, 3/16" or 1/4" Allen)
- Inch‑pound or small foot‑pound torque wrench (for derby cover screws)
- Plastic scraper or gasket scraper (non‑metal preferred)
- Brake cleaner or contact cleaner and clean rags
Pro Tips
- Clean both mating surfaces thoroughly and ensure they are dry and free of old gasket material before installing the new gasket.
- Start all derby cover screws by hand, then snug in a star or criss‑cross pattern to seat the cover evenly.
- Use a torque wrench and follow the Harley‑Davidson service manual torque spec for derby cover screws (typically in the 80–120 in‑lb range depending on model; always verify for the exact bike).
- If the gasket is marketed as reusable, inspect it carefully for compression set, nicks, or tears before re‑installing; replace if any damage is visible.
- After installation, wipe the area clean and check for weeping after a short ride to confirm sealing.
Common Mistakes to Avoid
- Over‑tightening derby cover screws and deforming the cover or gasket
- Re‑using old, flattened or torn gasket instead of replacing if damaged
- Not cleaning old gasket material and oil film off the mating surfaces
- Misaligning the gasket so that oil passages or screw holes are partially blocked
- Using RTV/silicone in addition to the gasket, which can cause leaks or squeeze‑out into primary
Comparison vs Stock/OEM
Compared with the stock Harley‑Davidson derby cover gasket, the Cometic C9152F1 is marketed as a higher‑quality, reusable gasket that maintains its seal through multiple removals, whereas many OEM fiber gaskets are considered single‑use and tend to tear or deform when the cover is removed.
Improvements
- Reusable design reduces the need to purchase a new gasket every time the derby cover is removed.
- Higher resistance to compression set, helping maintain sealing force after multiple heat cycles.
- Consistent sealing surface to help reduce derby/primary weeping on correctly installed covers.
Considerations
- Still requires correct torque and clean mating surfaces; it will not correct warped covers or damaged sealing surfaces.
- If the gasket becomes torn, deeply creased, or oil‑soaked and swollen, it should be replaced even though it is marketed as reusable.
Durability & Warranty
Expected Lifespan
Designed to withstand multiple derby cover removals and normal primary service intervals when properly torqued and not physically damaged.
Warranty
Standard Cometic limited warranty against defects in materials and workmanship (exact terms vary by distributor; consult the seller or Cometic directly).
Maintenance
Inspect the gasket each time the derby cover is removed. Replace if torn, excessively flattened, cracked, or if there is evidence of persistent oil leakage around the cover despite correct torque.
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