The Enginetech S5091 is a 1-piece viton rear main seal engineered as a stock replacement for 1985-1997 Buick, Cadillac, Chevrolet, GMC and more engine applications.
Important Notes
- 1-Piece design: verify your engine uses a 1-piece seal before ordering - 1-piece and 2-piece seals are not interchangeable.
- Viton construction: fluoroelastomer compound for high-temperature, long-cycle sealing performance.
- Offset Lip configuration.
Specifications
| Brand | Enginetech |
| Part Number | S5091 |
| Product Type | Rear Main Seal |
| Design | 1-Piece |
| Material | Viton |
| Lip Configuration | Offset Lip |
| Country of Origin | India |
| OEM / Aftermarket Cross References | FEL-PRO:BS40520, Victor Reinz:JV554, Detroit Diesel:17195, Detroit Diesel:17275 |
Vehicle Fitment
- Years: 1985-1997
- Makes: Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac
- Models: Astro, Blazer, Bonneville, Bravada, Brougham, C10, C10 Suburban, C1500, C1500 Suburban, C20, C20 Suburban, C2500, C2500 Suburban, C30, C3500, Caballero, Camaro, Caprice, Commercial Chassis, Corvette, Custom Cruiser, El Camino, Firebird, Fleetwood, G10, and more
The rear main seal (also called the crankshaft rear seal) prevents engine oil from leaking between the back of the crankshaft and the transmission bell housing. Over miles and heat cycles, the seal hardens, cracks, or takes a permanent compression set - producing the characteristic oil drip at the bell housing and, if left unchecked, oil contamination of the clutch disc or flex plate. Replacing the rear main seal during a transmission service or engine rebuild restores the final oil seal between the crankshaft and drivetrain, preventing slow leaks and protecting the clutch and flywheel from contamination.
