Motorad 288-174 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for BMW Models

The Motorad Standard 288-174 engine coolant thermostat is designed to maintain optimal engine temperature for select BMW vehicles. Engineered with precision, this thermostat ensures efficient coolant flow and temperature regulation to support engine performance and longevity.

• Sealing flange outside diameter: 3.31 inches
• Includes a rubber gasket/seal for secure installation
• Features a jiggle pin weep hole for pressure relief
• Bypass diameter of 1.69 inches and bypass length of 1.71 inches
• Flange thickness measures 0.05 inches
• Operates at a temperature of 170 degrees Fahrenheit
• Compatible with multiple BMW models including 530i, 540i, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, and 850i

About the Motorad Standard Product Line

The Motorad Standard line offers dependable replacement parts designed to meet OEM specifications. This product line focuses on delivering consistent quality and fitment for engine cooling components, making it a practical choice for maintaining BMW vehicles. The 288-174 thermostat is part of this line, ensuring compatibility and reliable performance within the specified BMW models.

Product Details and Specifications

The Motorad Standard 288-174 thermostat features a sealing flange with an outside diameter of 3.31 inches, providing a secure fit within the cooling system. It includes a rubber gasket to ensure a tight seal and prevent leaks. The jiggle pin weep hole allows for controlled pressure release, which helps avoid air pockets and promotes efficient coolant circulation. The bypass diameter and length (1.69 inches and 1.71 inches respectively) are designed to maintain proper coolant flow when the thermostat is closed. With a flange thickness of 0.05 inches, this thermostat fits precisely in the housing. It is calibrated to open at 170 degrees Fahrenheit, ensuring the engine reaches and maintains optimal operating temperature.

Compatible BMW Models and Applications

• BMW 530i
• BMW 540i
• BMW 740i and 740iL
• BMW 750iL
• BMW 840Ci
• BMW 850Ci, 850CSi, and 850i

This thermostat is specifically designed for these BMW models to regulate engine temperature effectively and prevent overheating or inefficient cooling.

Common Issues Addressed by This Thermostat

• Engine overheating due to thermostat failure
• Coolant leaks caused by worn or damaged seals
• Inconsistent engine temperature regulation
• Air pockets in the cooling system affecting performance
• Reduced fuel efficiency from improper engine temperature

Installation Notes and Tips

Ensure the engine is cool before beginning installation. Replace the old thermostat and gasket with the Motorad Standard 288-174 part to maintain a proper seal. Verify the jiggle pin weep hole is unobstructed to allow pressure relief. No special installation tools are included, so use appropriate hand tools and follow manufacturer guidelines for torque specifications. Proper installation helps prevent leaks and ensures optimal thermostat function.

Quality Assurance and Warranty

Motorad Standard thermostats are manufactured to meet or exceed OEM standards for fit and function. The 288-174 thermostat includes a rubber gasket for reliable sealing and is tested for durability and temperature accuracy. While specific warranty details are not provided, Motorad products typically come with quality assurance backed by industry standards to support long-term vehicle performance.