What does 'file fit' mean for these piston rings?

File fit rings mean that the end gap of each ring needs to be measured and adjusted by the installer to precisely match the cylinder bore diameter. This ensures a proper seal and prevents blow-by.

Are these rings suitable for all engine rebuilds?

These rings are designed for engine rebuilds and are +.005 inch oversize with specific ring groove dimensions. It's important to verify that these specifications match your engine's requirements and cylinder bore size.

Why can't these rings be shipped to California?

These piston rings are not CARB approved, which means they do not meet California's emissions standards for certain engine components. Therefore, they cannot be legally shipped to California.

Mahle Piston Ring Set 3942MS-112

Name: Mahle MS 3.937in+.005in 1.0mm 1.0mm 2.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-3-937in-005in-1-0mm-1-0mm-2-0mm-file-fit-rings-t14-132332
Price: 183.28 USD
Availability: BackOrder

Mahle MS 3.937in+.005in 1.0mm 1.0mm 2.0mm File Fit Rings

$183.28

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS 3.937in+.005in 1.0mm 1.0mm 2.0mm File Fit Rings. These piston rings are designed for engine rebuilds.

Key Features

This is a Mahle piston ring set, part number 3942MS-112.
Includes 1.0mm top and second rings, and a 2.0mm oil ring.
Rings are +.005 inch oversize.
Features a file-fit design, requiring end gap adjustment during installation.
Designed for engine rebuilding applications.
Not CARB approved; cannot ship to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

This is a Mahle piston ring set, part number 3942MS-112. These rings are designed for engine rebuilding applications where precise fitment is crucial. The set includes rings with specific dimensions: 1.0mm for the top and second rings, and a 2.0mm oil ring. They are also specified as being +.005 inch oversize and 'file fit', meaning the end gaps need to be adjusted during installation to match your specific cylinder bore.

Mahle is a well-known name in engine components, and this set is built to meet the demands of an engine rebuild. The file-fit design allows for customization to ensure a proper seal in various cylinder bores, which is important for optimal compression and oil control. This level of adjustability is often preferred by mechanics who are rebuilding engines and need to achieve a precise fit for performance and longevity.

Please note that these rings are not CARB approved and cannot be shipped to California. Always refer to your vehicle's specific service manual for installation procedures and recommended ring gap specifications.