Nissan Stagea C34 260RS Cylinder Head Oil Jet Plug (Rear) RB26DETT

The Nissan Stagea C34 260RS Cylinder Head Oil Jet Plug (Rear) for the RB26DETT engine is a precision-engineered solid steel component designed to seal the rear-most oil gallery passage in the cylinder block. While often referred to as a “jet,” this 5mm diameter by 5mm long plug functions solely as a solid seal, pressed into the rear port on the upper deck surface beneath the head gasket to control oil distribution.

This plug is essential for maintaining proper lubrication balance, ensuring that oil is delivered to high-demand areas such as the crankshaft bearings, turbochargers, and forward oil feeds to the valvetrain. By sealing the rear passage, it prevents excessive oil flow to the cylinder head, which could overwhelm return paths, reduce oil pressure in other circuits, and cause aeration under high-load or boosted conditions. Preserving this OEM design feature is crucial for engine reliability, reducing windage in the head and optimizing overall system efficiency.

Only one plug is required per engine block at the designated rear location, and replacement is recommended during cylinder head installation or full engine rebuilds to ensure correct sealing and alignment. Terra Firma Automotive provides genuine Nissan parts to maintain optimal lubrication, protect critical RB26DETT components, and support the long-term performance and reliability of the Nissan Stagea C34 260RS.

• One Required
• 5mm Long
• 5mm Wide