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Billet Rear Main Seal Cover for Gen 1 to Gen 4 Coyote Engines
Our billet rear main seal cover started out as a 2011 to 2017 part. It now covers all four Coyote generations, from the first 2011 Mustang GT to the current F-150.
It replaces the factory cast cover with a CNC machined 6061-T6 aluminum piece. That adds rigidity at the back of the block and helps the rear seal stay sealed under high load, high RPM and big power. That's where boosted, nitrous and competition engines need it most. It seals with an O-ring instead of silicone, so there's no sealant bead to get right and nothing squeezing into the crankcase. The O-ring holds up to methanol and ethanol, and it seals the same way every time through heat cycles.
Pick it by crank sensor, not by model year
The cover comes in three versions. The one you need depends on the crank sensor on the engine.
| Version | BPS part # | Factory applications |
|---|---|---|
| 2-wire VR (Gen 1-2) | EN042-1117 | 2011-2017 Mustang GT, 2015-2020 Shelby GT350, 2011-2017 F-150 |
| 3-wire Hall effect (Gen 3) | EN042-18 | 2018+ Mustang GT, 2018-2020 F-150, 2020-2022 Shelby GT500 |
| 3-wire Hall effect (Gen 4) | EN042-21 | 2021+ F-150 |
On a swap or a used long block, go by what is actually on the engine, not the year on the registration. Those often don't match. The quick check is the crank sensor connector: two wires is VR, three is Hall effect. If it has three wires and you can't tell whether it's a Gen 3 or a Gen 4, send us a photo and we'll sort it out.
What's in the kit
- CNC machined 6061-T6 billet aluminum cover
- OE crankshaft seal
- High temperature O-ring, methanol and ethanol resistant
- Stainless steel hardware
While the back of the block is open
The cover goes in behind the Flexplate or flywheel. With the transmission already out, this is the time to do the crank trigger ring too. It keeps the factory tooth pattern and works with the stock crank sensor. The Gen 1-2 and GT350 version is available now, and Gen 3-4 and GT500 is coming. Both parts are sold together in the rear main seal cover and crank trigger ring bundle.
If the build is moving to a standalone ECU, the unused cam sensor ports get cam sensor block-offs. For everything else that changed between generations, see Coyote timing by generation: what actually interchanges.
Designed by Billet Pro Shop and made in Napierville, Quebec. Shop the rear main seal cover or browse the rest of our Coyote engine parts.
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