Cometic Rear Main Seal – Toyota 2JZ-GE / 2JZ-GTE | High-Performance PTFE Crankshaft Seal | C4853

Replace the factory rear main seal on your Toyota 2JZ-GE or 2JZ-GTE with the Cometic high-performance rear main seal — engineered for the demands of performance and boosted 2JZ applications where the OEM rubber seal falls short. The rear main seal is the crankshaft seal at the rear of the engine block, sealing the crankshaft where it exits toward the flywheel or flexplate. On high-power 2JZ builds — particularly turbocharged and high-boost applications — elevated crankcase pressure accelerates rear main seal wear and failure, making a high-performance replacement seal a critical component in any serious 2JZ engine build or rebuild.

2JZ-GE vs. 2JZ-GTE – Same Seal

The Cometic CGSC4853 fits both the 2JZ-GE (naturally aspirated) and 2JZ-GTE (twin-turbocharged) variants of Toyota’s 2JZ inline-six — the rear crankshaft seal dimensions are shared across both engine variants. Verify your engine code before ordering if unsure.

Key Features

• PTFE Lip Seal Material: Cometic uses PTFE (polytetrafluoroethylene) for the seal lip — a chemically inert, heat-resistant material that outperforms the OEM rubber seal in high-temperature and high-pressure crankcase environments. PTFE is resistant to oil degradation, heat cycling, and the elevated crankcase pressures common in boosted and high-RPM 2JZ applications. The PTFE lip maintains its sealing integrity over a wider temperature range and longer service life than OEM rubber
• Performance and Boosted Application Rated: The Cometic rear main seal is specifically engineered for performance and racing engine applications — where elevated boost pressure, high RPM, and aggressive oil temperatures accelerate wear on OEM seals. Suitable for naturally aspirated, single-turbo, and twin-turbo 2JZ builds across all power levels
• Direct OEM Replacement Dimensions: The CGSC4853 is dimensioned to replace the factory Toyota rear main seal directly — no machining or modification to the block or crankshaft required. Installs in the factory seal bore using standard seal installation tools
• Cometic Quality: Cometic Gasket is a leading manufacturer of high-performance engine sealing products — supplying OEM, motorsport, and aftermarket applications globally. Cometic products are manufactured to precise dimensional tolerances with high-quality materials selected for each specific application

When to Replace the Rear Main Seal

• Oil leak at the rear of the engine block / front of the transmission bell housing
• Oil on the flywheel, clutch, or flexplate
• During any engine rebuild or bottom-end refresh — replace as a matter of course
• When upgrading to a high-power build where elevated crankcase pressure will accelerate OEM seal wear
• When installing a new or rebuilt crankshaft

Fitment

• Toyota Supra A80 — 2JZ-GE NA (1993–1998)
• Toyota Supra A80 — 2JZ-GTE Twin Turbo (1993–1998)
• Toyota Aristo — 2JZ-GE / 2JZ-GTE (1991–2004)
• Lexus IS300 — 2JZ-GE (2001–2005)
• Lexus GS300 — 2JZ-GE (1993–2005)

Specifications

• Brand: Cometic Gasket
• Part Number: C4853
• Component: Rear Main Crankshaft Seal
• Material: PTFE Lip Seal
• Fitment: Toyota 2JZ-GE / 2JZ-GTE
• Installation: Direct OEM Replacement

Note: Replace the rear main seal any time the engine is apart — it is a low-cost insurance item that is expensive to access after assembly. Ensure the crankshaft seal journal surface is clean, smooth, and free of scoring before installing the new seal — a damaged journal surface will cause premature seal failure regardless of seal quality. Use a proper seal installation tool to avoid cocking or damaging the seal during installation. Do not use a screwdriver or improvised tool to install the seal.