Sierra 18-7891 Oil Drain Kit for Mercruiser 224 CID (3.7L) Engines - 1/4 Inch-18 NPT Brass Adapter

The Sierra 18-7891 Oil Drain Kit is a corrosion-resistant brass drain kit built for Mercruiser 224 CID (3.7L) engines. Machined from brass, it is designed to withstand the harsh marine environment while providing a reliable point for draining engine oil during routine maintenance and oil changes. The kit uses 1/4 inch - 18 NPT threads to mate with the engine block or oil pan drain location on applicable Mercruiser 224 CID (3.7L) powerplants.

The kit includes an oil drain hose measuring 42 inches in length with a 0.5 inch outside diameter and a nominal wall thickness of 0.035 inches, allowing oil to be routed away from the engine compartment for cleaner, easier draining. As part of installation or service, the adapter on the 18-7891 is removed and replaced per the engine's oil drain servicing procedure. Sierra manufactures this kit to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a dependable option for maintaining their Mercruiser 224 CID (3.7L) engine's oil system.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7891
• Material: Brass
• Color: White
• Thread Size: 1/4 inch - 18 NPT
• Fitment: Mercruiser 224 CID (3.7L) Engines
• Hose Length: 42 inches
• Outside Diameter: 0.5 inches
• Nominal Wall Thickness: 0.035 inches
• Weight: 0.59 pounds

Fitment

• Mercruiser 224 CID (3.7L) Engines

Frequently Asked Questions

What engines is the Sierra 18-7891 oil drain kit designed for? The Sierra 18-7891 is designed for Mercruiser 224 CID (3.7L) engines.

What thread size does the Sierra 18-7891 use? It uses 1/4 inch - 18 NPT threads.

What material is the Sierra 18-7891 oil drain kit made from? It is machined from corrosion-resistant brass, which holds up well in a marine environment.

How long is the drain hose included with the Sierra 18-7891 kit? The hose measures 42 inches in length with a 0.5 inch outside diameter and a nominal wall thickness of 0.035 inches.

How much does the Sierra 18-7891 weigh? The Sierra 18-7891 oil drain kit weighs 0.59 pounds.

Does the Sierra 18-7891 meet OEM specifications? Yes, the Sierra 18-7891 is engineered to meet or exceed the specifications of the original equipment part it replaces on Mercruiser 224 CID (3.7L) engines.

How is the Sierra 18-7891 installed or replaced? During service, the adapter on the 18-7891 is removed and replaced as part of the engine's oil drain procedure on Mercruiser 224 CID (3.7L) engines.

Is the Sierra 18-7891 a genuine Sierra part? Yes, the 18-7891 is a Sierra-manufactured part engineered to meet the demands of high horsepower marine engines.

What is included with the Sierra 18-7891 kit? The kit includes a brass oil drain assembly with a 42 inch hose and adapter fitting with 1/4 inch - 18 NPT threads.

Is the Sierra 18-7891 resistant to corrosion? Yes, its brass construction is corrosion resistant, which suits it for use in the marine environment on Mercruiser 224 CID (3.7L) engines.

What color is the Sierra 18-7891 oil drain kit? The Sierra 18-7891 is finished in white.