lizenoz 10mm Valve Adjustment Tool for Slotted Studs — Jam Nut Locking Tool with Feeler Gauge, Hardened Cr-V

The lizenoz 10mm Valve Adjustment Tool is a combined screwdriver-and-socket tool that lets you lock the adjustment screw while tightening the 10mm jam nut, making valve lash adjustments faster and more precise on many Japanese engines.

If your engine is ticking, running rough, or using more fuel, valve lash might be the cause. This single-piece tool was engineered to simplify that job on vehicles and motorcycles that use 10mm jam nuts with slotted adjustment studs — common on many Honda, Toyota, and Nissan engines. Built from hardened chrome vanadium steel, it blends the holding action of a screwdriver with the torque of a socket so you can set clearances accurately without the screw spinning as you tighten the lock nut.

How does this tool keep the adjustment screw from turning?

The lizenoz tool integrates a central screwdriver shaft inside an outer 10mm socket. The screwdriver holds the slotted adjustment screw steady while the socket side tightens the jam nut independently, preventing the screw from rotating and altering the gap.

• Integrated screwdriver shaft holds the set screw during tightening
• Outer 10mm socket applies torque to the jam nut only
• Side window offers visual confirmation the blade remains in place
• 7.5-inch length gives leverage for stubborn nuts

Which engines and vehicles will this fit?

This tool is intended for valve adjusting studs that use a 10mm jam nut and a slotted set screw — a configuration frequently found on Japanese passenger cars and motorcycles. Always check your service manual to verify jam nut size before use.

• Designed for 10mm jam nuts with slotted studs
• Compatible with many Honda, Toyota, Nissan engines and similar Japanese models
• Works for cars and motorcycles with the same valve adjustment style
• Not suitable for non-slotted or different-size jam nuts

What materials and features make it durable and easy to use?

Constructed from heat-treated chrome vanadium steel, the tool resists torque-related wear and corrosion. The handle is knurled for a secure grip when your hands are greasy, and the visible cutout helps you monitor blade position during tightening.

• Hardened Cr-V steel construction for strength and longevity
• Corrosion-resistant finish to endure workshop environments
• Knurled anti-slip grip for better control under load
• Window cutout to visually confirm screwdriver alignment

Does it include accessories and how do I use the feeler gauge?

The package includes the single lizenoz valve adjustment tool plus a precision feeler gauge set so you can measure and set valve clearance correctly. Use the feeler gauge to establish the target gap, hold the adjustment screw with the tool, then tighten the jam nut while watching through the window to ensure the screw didn’t move.

• Comes with a precision feeler gauge for gap measurement
• Measure clearance with gauge, lock screw with tool, tighten nut
• Visual window confirms no unwanted movement during torqueing
• Saves time versus juggling separate screwdriver and wrench

Who is this for? DIY mechanics, professional technicians, and motorcycle owners who service Honda, Toyota, Nissan, and other Japanese engines with 10mm slotted valve adjustments will find this tool valuable. It’s especially helpful if you want to reduce setup time and avoid rework caused by the adjustment screw turning as you tighten the jam nut. Before purchasing, double-check your engine’s service manual to confirm a 10mm jam nut and slotted adjustment screw are used. The lizenoz tool is a practical, workshop-ready answer for anyone aiming for accurate valve lash adjustments with minimal fuss.