Mahle GS33800 Engine Coolant Pipe O-Ring

Engine Coolant Pipe O-Ring Seal

Mahle GS33800 is an OEM-standard engine coolant pipe O-ring set for Ford, Lincoln, and Mercury applications that use a back-side water pump water by-pass seal. Built with molded rubber and sized to match the original sealing dimensions, it helps maintain a tight coolant seal in the engine cooling system.

MAHLE gaskets are used by OEMs and technicians worldwide for sealing performance that follows original equipment requirements. The GS33800 is a direct-fit sealing solution for service work on vehicles such as the Ford F-150, Ford Explorer, and Lincoln Navigator.

Key Features

• OEM-standard engine coolant pipe O-ring for water pump by-pass sealing
• Molded rubber construction for consistent sealing performance
• Inside diameter: .500 inches
• Outside diameter: .630 inches
• Thickness: .068 inches
• Designed for back-side water pump sealing applications
• Cross-reference: FEL-PRO ES73048

Detailed Description

Mahle GS33800 is engineered as an OE-style coolant sealing component for Ford, Lincoln, and Mercury engines that use a water pump by-pass O-ring arrangement. The molded rubber design and precise dimensions support a proper seal at the coolant pipe connection, helping preserve cooling-system integrity in service applications. This part number is commonly searched for Ford F-150, Ford Explorer, and Lincoln Navigator coolant repair work, as well as other listed Ford and Mercury models. If you are replacing a leaking coolant pipe seal or servicing the water pump area, GS33800 provides the correct sealing profile for the application.

Common Repair Uses

• Coolant seepage at the water pump by-pass connection
• Leak repair at the back side of the water pump
• Sealing wear from age, heat, and coolant exposure
• Maintenance during water pump or cooling-system service
• Restoring a proper seal on Ford, Lincoln, and Mercury engines

Installation Notes and Tips

Clean the sealing surfaces thoroughly before installation and inspect the coolant pipe and mating surfaces for corrosion, pitting, or debris. Replace the O-ring during water pump or cooling-system service whenever the original seal shows flattening, cracking, or hardening. Verify application by year, make, and model before ordering; GS33800 is listed for multiple Ford, Lincoln, and Mercury vehicles including Ford Mustang, Ford Expedition, and Mercury Grand Marquis.

Quality Assurance

Mahle supplies OEM-standard gaskets and sealing products trusted by technicians and vehicle manufacturers. GS33800 is built to match original sealing requirements for dependable service in cooling-system repairs.