Sierra 18-0871-1 Service Valve with O-Ring, Replaces 438996 436852, Fits V4 & V6 60 Degree Engines 1988-2001

The Sierra 18-0871-1 Service Valve with O-Ring is a direct-fit replacement valve used in the cooling system of V4 and V6 (60 degree) outboard engines built from 1988 to 2001. It replaces OEM valves 438996 and 436852, restoring proper thermostat-housing or water-circuit sealing when the original valve wears out or the O-ring fails. The valve ships complete with its O-ring, so there is no need to source a separate seal to complete the repair.

This is a small, precision-machined component designed to seat correctly in the factory bore and hold pressure through normal engine operating temperatures. Because it is sized and shaped to the exact factory specification, it installs in place of the original valve without modification. Marine technicians and boat owners performing a cooling system service, thermostat replacement, or overheating diagnosis on a compatible V4 or V6 60 degree engine can use this valve as a like-for-like replacement part.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0871-1
• Item Type: Service Valve with O-Ring
• Included Components: Service valve with O-ring (1 each)
• Unit Count: 1
• Item Dimensions: 0.65 x 7.2 x 5.9 inches
• Weight: 0.01 pounds
• UPC: 808282378264
• OEM Cross-Reference: 438996, 436852

Fitment

• V4 & V6 (60 degree) engines, 1988-2001

Replaces (OEM)

• 438996
• 436852

Frequently Asked Questions

What engines does the Sierra 18-0871-1 service valve fit? The Sierra 18-0871-1 Service Valve with O-Ring fits V4 & V6 (60 degree) engines built from 1988 to 2001.

Does this valve include the O-ring? Yes, the 18-0871-1 ships as a complete service valve with its O-ring already included, so no separate seal needs to be purchased.

What OEM part numbers does the 18-0871-1 replace? It replaces OEM numbers 438996 and 436852.

Is the Sierra 18-0871-1 a direct OEM replacement or an aftermarket equivalent? It is an aftermarket part manufactured by Sierra that is a direct equivalent to OEM valves 438996 and 436852 for V4 & V6 (60 degree) engines, 1988-2001.

What are the dimensions of the 18-0871-1 service valve? The Sierra 18-0871-1 measures 0.65 x 7.2 x 5.9 inches.

How much does the 18-0871-1 service valve weigh? 0.01 pounds is the shipping weight of the Sierra 18-0871-1 Service Valve with O-Ring.

How many valves come in one package? One Sierra 18-0871-1 Service Valve with O-Ring is included per unit, a count of 1.

When would I need to replace this service valve? Replacement is typically needed when the O-ring seal degrades or the valve itself wears, causing coolant leaks or overheating in V4 & V6 (60 degree) engines from 1988-2001; the 18-0871-1 is used to restore the seal.

Is the 18-0871-1 valve compatible with other engine types besides V4 & V6 (60 degree)? Fitment for the Sierra 18-0871-1 is specified for V4 & V6 (60 degree) engines, 1988-2001; other engine types are not listed for this part.

What UPC is used to identify the Sierra 18-0871-1? The UPC for the Sierra 18-0871-1 Service Valve with O-Ring is 808282378264.