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Valve Lapping Paste

Zollex Valve Lapping Paste is a dual-action compound that combines coarse and fine abrasives to deliver a precise valve-to-seat seal with final surface roughness as low as 0.5 μm. Ideal for professional repairs and garage maintenance alike.

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Zollex Dual-Stage Valve Lapping Pastes – Regular | Expert | Diamond

Zollex lapping pastes are high-performance two-component abrasives engineered for optimal valve seat finishing. Unlike single-grade compounds that offer only rough or only finish lapping, our unique dual-stage formula delivers both in a single application. Each syringe contains a carefully balanced blend of coarse and fine abrasives, which operate sequentially during the lapping process.

How It Works:

  1. Initial Cutting Stage – The coarse abrasive particles initiate controlled material removal, ensuring fast stock reduction and rapid shaping of the valve and seat contact surfaces. This ensures precise alignment and sealing geometry.

  2. Microfinishing Stage – As the coarse phase wears down, the embedded fine abrasives take over. These ultra-fine grains progressively refine the surface, reducing roughness and improving sealing efficiency without requiring a change of compound.

Surface Finish Performance:

  • Regular: for general repairs – surface roughness down to 0.7 μm

  • Expert: for high-quality seat prep – down to 0.6 μm

  • Diamond: for precision-grade performance – as low as 0.5 μm

This range allows the user to select the optimal finish level based on engine type, operating load, and rebuild goals.

⚙️ Key Technical Advantages:

  • 2-in-1 dual-phase lapping: eliminates the need to switch pastes during the process

  • Consistent abrasive distribution: guarantees uniform material removal and finish

  • Optimized grain progression: designed to work sequentially during valve rotation

  • Ideal for valve diameters from 16 mm to 60 mm

  • Distinctive rustling feedback: experienced users recognize the “correct” acoustic response during proper lapping

  • Compatible with cast iron, steel, and hardened seats

  • Suitable for both full rebuilds and quick DIY refreshes

Whether you’re performing full head reconditioning or simply reseating valves during a gasket replacement, Zollex pastes ensure proper sealing, improved compression, and extended engine life.

Application:

  1. Clean the Parts: Thoroughly degrease the valve and valve seat using brake cleaner or carburetor cleaner. Make sure all surfaces are dry and free from old carbon, oil, or debris.

  2. Apply the Paste: Squeeze a small amount of Zollex lapping paste onto the sealing surface of the valve (not on the stem). Spread evenly.

  3. Begin Lapping: Insert the valve into the guide and use a manual or suction-type valve lapping tool. Rotate the valve back and forth between your hands or with the tool, using light to moderate pressure. Periodically lift and rotate the valve 90° to ensure even abrasion.

  4. Monitor the Sound: A correct lapping process creates a distinctive “rustling” or “squeaking” sound. When this sound fades, the coarse phase has ended and the fine abrasive has taken over.

  5. Check the Contact Pattern: Remove the valve, wipe both surfaces clean, and inspect the contact ring on both the valve and the seat. A uniform gray ring about 1.5–2 mm wide indicates good contact.

  6. Repeat if Necessary: For worn or uneven seats, repeat the process until a full, consistent ring is achieved.

  7. Final Cleaning: Once lapping is complete, thoroughly wash the valve, seat, and surrounding areas to remove all abrasive residue. Use compressed air and solvent for best results.

Type

Regular, Expert, Diamond