Sierra Thermostat Gasket 18-1202, Replaces 332369, V-4 Engines, Pack of 2

The Sierra 18-1202 thermostat gasket seals the thermostat housing to the engine block, preventing coolant leaks and maintaining proper cooling system pressure on V-4 marine engines. This gasket is a direct fit replacement designed to restore a tight, leak-free seal whenever a thermostat is serviced, replaced, or inspected. Because a worn or hardened gasket is one of the most common causes of coolant seepage around the thermostat housing, replacing it at the same time as the thermostat -- or whenever the housing is removed for any reason -- helps prevent repeat leaks and re-work. The 18-1202 is sold as a pack of 2, giving the installer a spare on hand or enough material to service two thermostat housings in one job. It is built to the dimensions and specifications of the original equipment gasket it replaces, so it seats correctly against the mating surfaces without additional trimming or fitting. This gasket is intended for V-4 marine engine applications and directly replaces OEM part number 332369. Keeping a genuine Sierra gasket in inventory ensures the correct thickness and material compression for a proper seal, avoiding the leaks and reduced engine performance that can result from using an incorrectly sized or generic gasket.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1202
• Product Type: Thermostat Gasket
• Engine Fitment: V-4
• Package Quantity: 2 gaskets per pack
• Weight: 0.02 pounds

Fitment

• V-4 marine engines

Replaces (OEM)

• 332369

Frequently Asked Questions

What does the Sierra 18-1202 thermostat gasket fit? The Sierra 18-1202 thermostat gasket is designed for V-4 marine engines and directly replaces OEM part number 332369.

How many gaskets come in a pack of the 18-1202? Each pack of the Sierra 18-1202 thermostat gasket contains 2 gaskets, enough to service two thermostat housing installations or keep a spare on hand.

Is OEM number 332369 the same part as Sierra 18-1202? Yes, the Sierra 18-1202 thermostat gasket is a direct replacement for OEM part number 332369.

Where is this gasket used on the engine? This gasket seals the thermostat housing to the engine block on V-4 marine engines, sealing the coolant passage around the thermostat.

When should the thermostat gasket be replaced? The 18-1202 gasket should be replaced any time the thermostat housing is removed, such as during thermostat replacement, inspection, or if coolant leakage is present around the housing.

Does the pack include the thermostat itself? No, the Sierra 18-1202 is a gasket only; it does not include the thermostat. It is intended to be used when installing or servicing a thermostat.

How much does the 18-1202 gasket weigh? The Sierra 18-1202 thermostat gasket weighs 0.02 pounds.

Is the Sierra 18-1202 a genuine OEM part or aftermarket? The 18-1202 is a Sierra-branded replacement part manufactured to match the fit and function of OEM part 332369 for V-4 marine engines.

Can this gasket be reused after removal? Gaskets compress to form a seal during installation, so the 18-1202 thermostat gasket should be replaced with a new one each time the thermostat housing is removed rather than reused.

Will this gasket fit engines other than V-4? The Sierra 18-1202 thermostat gasket is specified for V-4 marine engines; fitment outside that engine type is not listed for this part number.