The Nissan Skyline R32, R33, and R34 GTR Cylinder Head Oil Jet Plug (Rear) for the RB26DETT engine is a precision-engineered solid steel plug designed to seal a specific rear oil gallery passage in the cylinder block. Although called a “jet,” this 5mm diameter by 5mm long plug functions purely as a solid sealing component, pressed into the rear-most port on the upper deck surface beneath the head gasket. Its purpose is to block the unused oil feed path, controlling oil distribution to critical components.
This plug is vital for maintaining proper lubrication system balance, ensuring that oil volume is directed toward high-demand areas such as the crankshaft bearings, turbochargers, and forward oil feeds to the valvetrain. By sealing the rear port, it prevents excessive oil flow to the cylinder head that could overwhelm return paths, reduce oil pressure elsewhere, and cause aeration under high-load or boost conditions. Maintaining this OEM design feature preserves engine reliability, reduces windage in the head, and improves overall system efficiency.
One plug is required per engine block at the designated rear location, and it is recommended to replace this component during cylinder head installation or rebuilds to ensure proper sealing and alignment. Terra Firma Automotive supplies genuine Nissan parts to maintain optimal lubrication performance, safeguard critical RB26DETT components, and uphold the long-term reliability and high-performance standards of Skyline GTR engines.
- One Required
- 5mm Long
- 5mm Wide
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