Dorman 902-5102 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Replace a cracked, missing, or worn coolant reservoir cap with this direct-fit Dorman engine coolant reservoir cap. Built from black plastic with a 76.2 mm diameter and a 15 psi pressure rating, it restores proper sealing at the coolant tank on select Ford, Lincoln, and Mercury applications.

Use Dorman 902-5102 when you need a twist-on, pressurized coolant tank cap that matches the original style and dimensions. This part cross-references Ford OE numbers such as 4C4Z8100B and 3578833C2 for the same application.

Key Features

• Direct replacement engine coolant reservoir cap
• Twist-on attachment for secure installation
• Pressurized design with a 15 psi rating
• Black plastic construction
• 76.2 mm diameter for OE-style fit
• Non-vented design with no pressure release lever
• Fits select Ford, Lincoln, and Mercury cooling system applications
• Dorman 902-5102 for coolant tank cap replacement

Detailed Description

Dorman 902-5102 is engineered as a direct replacement coolant reservoir cap for vehicles that use a pressurized, twist-on tank cap. The cap is designed to seal the engine coolant reservoir and maintain system pressure, helping the cooling system operate as intended. For buyers searching for a Ford coolant reservoir cap, Lincoln coolant tank cap, or Mercury engine coolant reservoir cap, this part provides an OE-style solution with the correct diameter, pressure rating, and attachment type.

Its plastic construction and black finish match common factory reservoir cap designs, while the non-vented layout and 15 psi pressure rating support proper cooling system sealing. If your original cap is cracked, lost, or no longer holding pressure, Dorman 902-5102 offers a straightforward replacement for the original coolant tank cap.

What It Helps Fix

• Coolant loss from a cracked or damaged reservoir cap
• Pressure loss in the cooling system
• Cap fitment issues caused by a worn twist-on seal
• Missing or misplaced coolant tank cap
• Cooling system warning symptoms related to poor reservoir sealing

Installation Notes and Tips

Confirm the reservoir cap diameter, pressure rating, and twist-on style before installation. Compare the original cap to Dorman 902-5102 to verify the 76.2 mm size and pressurized design. Install on a cool engine and inspect the reservoir neck and sealing surface for damage before tightening the cap.

For fitment-based searches, this part is commonly referenced for Ford coolant reservoir cap, Lincoln coolant reservoir cap, and Mercury coolant tank cap applications. Always match the original cap specifications to the vehicle’s cooling system requirements.

Quality Assurance

Dorman manufactures direct replacement parts to match original equipment form and function. Part number 902-5102 is built to the listed specifications for pressure, diameter, and attachment style to support proper cooling system service.