Description
Sierra 18-0519 One Piece Rear Main Seal is a premium aftermarket crankshaft seal designed for standard rotation marine inboard and stern drive engines.
Technical Specifications & Compatibility Matrix
This seal corresponds to specific dimensions and cross-references directly with major original equipment manufacturers (OEM):
|
Attribute |
Specification |
OEM Cross-Reference / Part Number |
Approved Engine Layouts |
|
Inner Diameter (Shaft) |
3.792" |
Mercruiser / Mercury Marine: 26-14240 |
GM 3.0L / 181 cid |
|
Outer Diameter (O.D.) |
4.536" |
Volvo Penta: 3852657, 912957 |
GM 4.3L V6 / 262 cid |
|
Width / Thickness |
0.482" |
OMC Stern Drive: 3852657, 0509394 |
GM 5.0L V8 / 305 cid |
|
Material / Rotation |
Rubber with metal reinforcement / Standard |
Crusader: 7070400 |
GM 5.7L V8 / 350 cid |
Verification and Fitment Steps
Because marine engine modifications over different model years can alter seal styles (e.g., older engines utilizing a two-piece seal versus modern one-piece housing), ensure proper fitment before removing major components:
- Inspect the Seal Housing: This seal is explicitly engineered for GM-based engine blocks built with a one-piece rear main seal design. If your block uses a split two-piece seal, this part will not fit.
- Determine Rotation: This part is built strictly for Standard Rotation (Left-Hand) engine configurations. If you run a dual-engine setup with a counter-rotating (Right-Hand) engine, confirm alternative seal requirements.
Specifications
- California Residents:
- WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov
- Special Order:
- Yes
