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Start ShoppingCOMETIC C9437 Evo Sportster Oil Pump O-Ring - High-Performance FKM Gasket for Reliable Engine Sealing
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Description
Upgrade your Evo Sportster's engine reliability with COMETIC's precision-engineered oil pump O-Ring. This high-performance gasket ensures seamless sealing, preventing leaks and maintaining peak engine efficiency under extreme conditions.
Key Features
- FKM (Viton) Rubber Construction: Resists heat, oil, and chemicals for long-lasting durability in harsh engine environments.
- Exact Fitment: 3.375in ID and 3.625in OD dimensions ensure perfect compatibility with Evo Sportster oil pump systems.
- Lightweight Design: Only 0.5 oz (14g) reduces stress on engine components without compromising strength.
- High-Temperature Resistance: Maintains flexibility and integrity up to 300°F (150°C) for reliable performance.
Why Choose This Product
Cometic's C9437 O-Ring is engineered for riders who demand uncompromising engine performance. Its Viton material withstands extreme temperatures and oils, preventing degradation and costly leaks. The precise dimensions ensure a perfect seal, while the lightweight design minimizes wear on engine components. Trust Cometic's reputation for quality gaskets to keep your Sportster running smoothly and reliably.
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Upgrade your Evo Sportster's engine reliability with COMETIC's precision-engineered oil pump O-Ring. This high-performance gasket ensures seamless sealing, preventing leaks and maintaining peak engine efficiency under extreme conditions.
Key Features
- FKM (Viton) Rubber Construction: Resists heat, oil, and chemicals for long-lasting durability in harsh engine environments.
- Exact Fitment: 3.375in ID and 3.625in OD dimensions ensure perfect compatibility with Evo Sportster oil pump systems.
- Lightweight Design: Only 0.5 oz (14g) reduces stress on engine components without compromising strength.
- High-Temperature Resistance: Maintains flexibility and integrity up to 300°F (150°C) for reliable performance.
Why Choose This Product
Cometic's C9437 O-Ring is engineered for riders who demand uncompromising engine performance. Its Viton material withstands extreme temperatures and oils, preventing degradation and costly leaks. The precise dimensions ensure a perfect seal, while the lightweight design minimizes wear on engine components. Trust Cometic's reputation for quality gaskets to keep your Sportster running smoothly and reliably.| SKU | GM8118B519 |
|---|---|
| MPN | C9437 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | Sportster Evolution (XL883, XL1200) | 1986-2021 |
| Harley-Davidson | Big Twin Evolution | 1984-1999 |
Frequently Asked Questions
Yes, C9437 fits all Evolution Sportster models 1986-2021 (883/1200cc). Confirm your model in fitment tab.
Yes, Viton (FKM) material resists heat and oil degradation better than stock rubber O-ring.
Yes, apply thin bead of high-temp RTV to oil pump housing. O-ring alone may not seal perfectly.
No, always replace O-ring during oil pump service. Old O-rings become brittle and leak.
Age hardening, improper torque, contaminated mating surfaces, or over-revving causing pressure spikes.
Installation Guide
Difficulty
Easy
Est. Time
15 min
Tools Required
- 10mm socket
- ratchet
- gasket scraper
- RTV sealant
Pro Tips
- Clean mating surfaces with brake cleaner
- Apply thin bead of RTV to pump housing
- Torque bolts to 90-120 in-lbs in crisscross pattern
- Replace while oil pump is off for rebuild
Common Mistakes to Avoid
- Not cleaning oil pump mating surfaces thoroughly
- Over-tightening oil pump bolts
- Using wrong sealant
Comparison vs Stock/OEM
Viton (FKM) rubber vs stock nitrile/buna-N
Improvements
- 300°F higher heat resistance
- Better oil and fuel resistance
- Longer service life (3-5x)
- Prevents common Evo oil pump leaks
Considerations
- Slightly higher cost than OEM
Durability & Warranty
Expected Lifespan
Engine life (100,000+ miles) with proper install
Warranty
1 year Cometic manufacturer defect warranty
Maintenance
Replace during oil pump service (every 20,000-50,000 miles)
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