ACL Flexigauge Precision Bearing Clearance Gauge (Plastigauge / Plastigage)

ACL Flexigauge – Professional Plastigauge / Plastigage Equivalent

The ACL Flexigauge is a world-class precision tool used for checking bearing oil clearances. It is the professional equivalent to tools commonly known as Plastigauge or Plastigage. Whether you are building a high-performance Honda engine or performing a standard rebuild, verifying clearances on main bearings, rod bearings, and camshaft journals is essential for engine reliability.

Flexigauge provides a quick and highly accurate alternative to complex micrometer measurements. By placing the precision plastic strip between the parts and tightening them, the strip flattens to a specific width. Using the included scale, you can easily read the exact clearance based on the width of the flattened material.

Available Ranges (Color-Coded)

Depending on your engine's specifications, choose the appropriate Plastigage range:

• AG-1 (Green): 0.025mm – 0.076mm (0.001" – 0.003") – Most common for Honda OEM specs.
• AR-1 (Red): 0.051mm – 0.152mm (0.002" – 0.006")
• AB-1 (Blue): 0.102mm – 0.229mm (0.004" – 0.009")
• AY-1 (Yellow): 0.203mm – 0.406mm (0.008" – 0.016")

Why use ACL Flexigauge?

• Industry Standard: Just like Plastigauge, ACL Flexigauge is trusted by professional engine shops globally.
• Verification: Perfect for double-checking "blueprint" clearances after using micrometers.
• Multi-Purpose: Can also be used to measure head warp, flange gaps, or any clearance between two fitted surfaces.

Instruction Manual

Ensure all surfaces are completely clean and oil-free before using the Plastigage strip. For a detailed guide on how to read the measurements, click below:

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FAQ – Frequently Asked Questions

Is ACL Flexigauge the same as Plastigauge?
Yes, it is the same type of tool and works on the exact same principle. ACL is a leading manufacturer of engine bearings, and their Flexigauge is considered one of the most reliable Plastigage equivalents on the market.

How do I read the measurement?
After tightening the bearing cap to the correct torque, remove it and use the scale printed on the Flexigauge envelope. Match the width of the flattened strip to the marks on the scale to find your clearance in millimeters or inches.

Can I use it on oily surfaces?
No. For the most accurate "Plastigage" reading, surfaces must be dry and free of oil. Any residual oil can affect the way the strip flattens.