Mahle 42001CP Engine Piston Ring Set

Mahle 42001CP Piston Ring Set

The Mahle 42001CP piston ring set is a premium engine piston ring set built for Toyota Tacoma, Tundra, 4Runner, and T100 applications that call for standard bore sizing and a shallow groove design. It combines low-friction ring technology with durable ring materials to support oil control, compression sealing, and long service life in rebuild work.

Key Features

• Part number 42001CP from Mahle
• Standard bore diameter: 3.6811 in
• Premium-grade engine piston ring set
• Top ring material: ductile iron with chrome face coating
• Second ring material: cast iron
• Oil ring assembly material: stainless steel
• Top ring thickness: 0.0587 in
• Second ring thickness: 0.0587 in
• Oil ring assembly thickness: 0.1575 in
• Shallow groove design
• Cross-reference: Hastings Piston Rings 2C4911

Detailed Description

Mahle 42001CP is engineered for OE-style engine rebuilding where ring fit, sealing performance, and oil control matter. The ring package uses a ductile iron top ring with chrome facing, a cast iron second ring, and a stainless steel oil ring assembly to balance wear resistance, combustion sealing, and oil management. This makes it a strong match for Toyota Tacoma, Toyota Tundra, Toyota 4Runner, and Toyota T100 engines that require a standard-size piston ring set with shallow groove configuration.

Fits 1995-2004 Toyota Tacoma, N/A. Fits 2000-2004 Toyota Tundra, N/A. Fits 1996-2002 Toyota 4Runner, N/A. Fits 1995-1998 Toyota T100, N/A. Part number 42001CP is also a useful search term when sourcing a Mahle piston ring set for Toyota engine rebuilds.

What It Helps Address

• Excessive oil consumption from worn or tired rings
• Low compression caused by ring wear or poor sealing
• Blow-by that affects crankcase pressure and engine performance
• Scoring or wear concerns during a standard rebuild
• Need for a replacement ring set with OE-style material selection

Installation Notes and Tips

Verify bore diameter, ring groove dimensions, and piston compatibility before assembly. Clean the ring lands thoroughly, check end gaps to the engine builder’s specifications, and confirm the shallow groove design matches the piston set being used. Proper cylinder preparation and careful ring orientation are important for sealing performance and break-in.

Quality Assurance

Mahle piston rings are developed around OE requirements and focus on reduced friction, controlled oil use, lower ring mass, and extended service life. The 42001CP reflects that engineering approach with premium materials and application-specific sizing for Toyota rebuilds.