Sierra 18-3670 Thermostat Kit, 160 Degree F, Replaces GLM 13440, Fits Volvo Penta 2.5L & 3.0L (1982-88)

The Sierra 18-3670 Thermostat Kit is a complete engine temperature control kit for Volvo Penta 2.5L and 3.0L engines (1982-88). The kit opens at 160 degrees F, regulating coolant flow so the engine reaches and maintains proper operating temperature. It contains a thermostat and a thermostat housing, giving the buyer both wear components needed for a full thermostat replacement in one purchase rather than sourcing each part separately.

Sierra manufactures marine parts to meet or exceed the original equipment they replace, and this kit is built for the harsh marine operating environment. The housing and thermostat are made of durable plastic construction finished in white, sized to match the original Volvo Penta fitment for a direct, drop-in replacement. This kit is intended for boaters and marine technicians performing routine cooling system maintenance or replacing a failed or stuck-open/stuck-closed thermostat on a compatible Volvo Penta engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3670
• Product Type: Thermostat Kit
• Opening Temperature: 160 degrees F
• Fitment: Volvo Penta 2.5L & 3.0L (1982-88)
• Kit Contents: Thermostat (18-3558), Thermostat Housing (18-2858)
• Material: Plastic
• Color: White
• Weight: 0.13 pounds
• UPC: 030999563088

Fitment

Fits Volvo Penta 2.5L & 3.0L engines (1982-88).

Replaces (OEM)

982554, 314809, GLM 13440

Frequently Asked Questions

What engines does the Sierra 18-3670 thermostat kit fit? The Sierra 18-3670 Thermostat Kit fits Volvo Penta 2.5L and 3.0L engines (1982-88).

What temperature does the 18-3670 thermostat open at? It opens at 160 degrees F, which is the rated opening temperature for the Sierra 18-3670 Thermostat Kit.

What is included in the 18-3670 kit? The kit contains one thermostat (Sierra 18-3558) and one thermostat housing (Sierra 18-2858), giving you both components needed for a complete thermostat replacement.

What OEM part numbers does the Sierra 18-3670 replace? The Sierra 18-3670 Thermostat Kit cross-references to OEM numbers 982554 and 314809, and is interchangeable with GLM 13440.

Is the 18-3670 a genuine Sierra part or aftermarket? The 18-3670 is a genuine Sierra part, manufactured to meet or exceed the original equipment part it replaces on Volvo Penta 2.5L and 3.0L engines.

What material is the thermostat housing made of? The thermostat housing in the Sierra 18-3670 kit is made of plastic, finished in white.

How much does the Sierra 18-3670 thermostat kit weigh? The Sierra 18-3670 Thermostat Kit weighs 0.13 pounds.

Can I order the thermostat and housing separately instead of the full kit? The individual components are Sierra 18-3558 (thermostat) and Sierra 18-2858 (thermostat housing), which are the same parts contained in the 18-3670 kit.

Does this kit include a gasket? The Sierra 18-3670 Thermostat Kit contains a thermostat (18-3558) and a thermostat housing (18-2858).

Will the 18-3670 fit engines outside the 1982-88 model years? The Sierra 18-3670 is specified for Volvo Penta 2.5L and 3.0L engines from 1982-88; fitment outside that range is not specified.

Is the GLM 13440 the same part as the Sierra 18-3670? GLM 13440 is listed as interchangeable with the Sierra 18-3670 Thermostat Kit.

How do I know if my thermostat needs replacement? A thermostat stuck open or closed will cause overheating or under-heating; the Sierra 18-3670 Thermostat Kit replaces both the thermostat and housing to resolve worn or failed components.