GSC P-D Nissan TB48DE Valve Stem Viton 7mm Seal - SET OF 24

The GSC P-D Nissan TB48DE Valve Stem Viton 7mm Seal SET OF 24 (part number 1054) delivers factory-beating sealing performance for the demanding 4.8L TB48DE inline-six engine found in the Nissan Patrol and Safari. Engineered from high-grade Viton fluoroelastomer, GSC1054 maintains a tight seal under extreme heat cycles, high-RPM driving, and the aggressive oil environments found in modified or high-mileage TB48 engines. Each set covers the complete engine with all 12 intake and 12 exhaust valve stem seals required for a full cylinder-head refresh.

Features and Benefits

• Viton fluoroelastomer construction resists heat, fuel, and oil degradation far beyond OEM rubber seals
• Precision 7mm stem diameter fits all TB48DE intake and exhaust valve guides without modification
• SET OF 24 provides complete engine coverage for all 12 cylinders (12 intake + 12 exhaust)
• Eliminates blue-smoke-on-startup caused by worn or cracked factory valve seals
• Compatible with stock and performance camshafts, including GSC S2 and S3 grinds
• Manufactured to OEM+ tolerances for consistent lip-seal contact and oil metering
• Reduces oil consumption and keeps combustion chambers cleaner on high-mileage TB48 engines
• GSC Power Division quality control ensures each seal meets dimensional specifications before packaging

Fitment

Specifications

What's Included

• 24 x Viton valve stem seals (12 intake, 12 exhaust)
• Sized for Nissan TB48DE 7mm valve stems

Frequently Asked Questions

What vehicles does GSC1054 fit?
The GSC P-D 1054 valve stem seal set fits Nissan Patrol GR Y61 and Nissan Safari models equipped with the TB48DE 4.8L inline-six DOHC engine, spanning 1997 through 2022 production years.

Why choose Viton over OEM rubber valve stem seals?
Viton fluoroelastomer withstands sustained temperatures above 200 degrees Celsius and resists degradation from synthetic motor oils, high-octane fuels, and ethanol blends. OEM rubber seals harden and crack over time, especially in engines running elevated oil temps. The GSC1054 set maintains consistent sealing for far longer than factory replacements.

Does GSC1054 work with aftermarket camshafts?
Yes. The 1054 seals are compatible with stock TB48DE camshafts as well as GSC S2 and S3 performance grinds. They are dimensionally identical to OEM and seat securely on stock valve guides without modification.

How many valve stem seals does a TB48DE engine require?
The Nissan TB48DE is a 6-cylinder DOHC engine with 4 valves per cylinder, totaling 24 valves (12 intake, 12 exhaust). The GSC1054 set provides all 24 seals needed for a complete valve-seal replacement job.

What are the symptoms of worn TB48DE valve stem seals?
Common symptoms include blue smoke from the exhaust on cold starts (as oil drains past the seals overnight), increased oil consumption without visible leaks, and fouled spark plugs. Replacing with GSC1054 typically eliminates these issues.

Can these be installed without removing the cylinder head?
Yes, with a spark plug hole air fitting and a valve spring compressor tool, TB48DE valve stem seals can be replaced in-vehicle. However, a full head-off procedure allows for thorough inspection and cleanup. Consult a qualified mechanic if you are unsure.

Is this the complete set for both intake and exhaust valves?
Yes. Each GSC1054 package contains 24 pieces covering all 12 intake and 12 exhaust valve positions on the TB48DE engine. No supplemental seals are needed for a full replacement.

What is the difference between the 1054 and OEM Nissan valve stem seals?
The GSC Power Division 1054 seals use Viton compound rather than the standard rubber or nitrile used in OEM parts. This upgrade provides superior heat resistance, improved oil retention, and longer service life, particularly valuable in engines subjected to hard use or extended high-load operation.

Installation Instructions

1. Disconnect the battery and allow the engine to cool completely before beginning work.
2. Remove the valve cover(s) and camshaft journals to access the valve spring retainers.
3. Pressurize the cylinder through the spark plug hole using a compression fitting and shop air (at least 100 PSI) to hold the valves in place.
4. Use a valve spring compressor to compress each spring and remove the keepers with a magnetic tool.
5. Lift off the retainer, spring, and spring seat, then pull the old valve stem seal from the guide using seal removal pliers.
6. Lubricate the new GSC1054 Viton seal with clean engine oil and install squarely onto the valve guide using a seal installation tool of the correct diameter.
7. Reassemble the spring seat, spring, retainer, and keepers, verifying keeper seating before releasing spring pressure.
8. Repeat for all 24 valves, then reinstall camshafts, valve cover, and all remaining components.
9. Start the engine and verify no oil smoke or unusual valve train noise before returning to service.

Proposition 65 Warning: This product can expose you to chemicals including carbon black, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.