Sierra 18-4253-9 Drain Screw O-Ring, Replaces 311598, Johnson/Evinrude Outboard, Pack of 5

The Sierra 18-4253-9 Drain Screw O-Ring is a rubber sealing ring designed to be used with the Sierra 18-2387 Drain Screw on Johnson/Evinrude outboard engines and OMC stern drives. This O-ring creates the seal that keeps gear case lubricant contained around the drain screw threads, preventing leaks and water intrusion at one of the most commonly serviced points on an outboard lower unit. Because drain screw O-rings compress and take a permanent set each time the drain screw is removed for a gear lube change, they should be replaced every time the drain screw is pulled rather than reused, and keeping a supply on hand avoids a return trip to the parts counter mid-service.

Each package contains five O-rings, made from black rubber for reliable resistance to gear lube and marine environments. Sierra parts are built to meet or exceed the specification of the original equipment part they replace, so this O-ring restores the factory seal without modification to the drain screw or gear case housing.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4253-9
• Replaces (OEM): 311598
• Material: Rubber
• Color: Black
• Package Quantity: 5 O-rings per pack
• Used With: 18-2387 Drain Screw
• Weight: 0.05 pounds
• UPC: 808282187118

Fitment

Designed for use in Johnson/Evinrude outboard engines and OMC stern drives, used with the Sierra 18-2387 Drain Screw.

Replaces (OEM)

• 311598

Frequently Asked Questions

What is the Sierra 18-4253-9 used for? It is a rubber O-ring that seals the Sierra 18-2387 Drain Screw on Johnson/Evinrude outboard engines and OMC stern drives, preventing gear lube leaks and water intrusion at the drain screw.

What OEM part number does the 18-4253-9 replace? Sierra 18-4253-9 replaces OEM part number 311598.

How many O-rings come in a pack? Each package of the Sierra 18-4253-9 includes five drain screw O-rings.

What is the drain screw O-ring made of? Black rubber, chosen for its resistance to gear lube and marine environments.

Which drain screw does this O-ring fit? The 18-4253-9 O-ring is used with the Sierra 18-2387 Drain Screw.

Should the drain screw O-ring be replaced every time the drain screw is removed? Yes, once compressed and removed the O-ring takes a permanent set, so it is best practice to install a fresh 18-4253-9 O-ring each time the drain screw is pulled for a gear lube change.

Does this O-ring fit stern drives as well as outboards? Yes, the 18-4253-9 O-ring is designed for use in Johnson/Evinrude outboard engines and OMC stern drives.

How much does a pack of these O-rings weigh? A package of five Sierra 18-4253-9 O-rings weighs 0.05 pounds.

Is the Sierra 18-4253-9 a genuine OEM part or an aftermarket replacement? It is a Sierra aftermarket part built to meet or exceed the specification of the original 311598 equipment it replaces.

What is included in the package? One package of the 18-4253-9 contains five black rubber drain screw O-rings, with no drain screw or other hardware included.