The Enginetech S1389 is a 2-piece polyacrylate rear main seal engineered as a stock replacement for 1964-1990 Buick, Cadillac, Chevrolet, GMC and more engine applications.
Important Notes
- 2-Piece design: verify your engine uses a 2-piece seal before ordering - 1-piece and 2-piece seals are not interchangeable.
- Polyacrylate construction: classic-engine-specification compound.
Specifications
| Brand | Enginetech |
| Part Number | S1389 |
| Product Type | Rear Main Seal |
| Design | 2-Piece |
| Material | Polyacrylate |
| Country of Origin | Peru |
| OEM / Aftermarket Cross References | FEL-PRO:BS40613, Victor Reinz:JV742R, Detroit Diesel:17200 |
Vehicle Fitment
- Years: 1964-1990
- Makes: Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac
- Models: 442, 98, Apollo, Bonneville, Brougham, Caballero, Calais, Camaro, Caprice, Catalina, Century, Custom Cruiser, Cutlass, Cutlass Calais, Cutlass Ciera, Cutlass Cruiser, Cutlass Salon, Cutlass Supreme, Cutlass Tiara, DeVille, Delmont 88, Delta 88, El Camino, Eldorado, Electra, 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.
