Sierra Temperature Sender 18-7647 for Volvo Penta Inboard Engines, Interchangeable with 872066

The Sierra 18-7647 is a screw-in temperature sender built for Volvo Penta inboard engines. It mounts directly into the engine block or cylinder head to feed an analog temperature signal to the dash gauge, giving the operator a continuous, accurate read on coolant temperature so overheating can be caught before it causes engine damage.

The sender body is machined from brass for corrosion resistance in a marine environment, and the internal sensing element is rated to 260 degrees Fahrenheit with a measurement accuracy of plus or minus 1.5 percent. It uses a standard screw-in mounting type and analog output, so it is compatible with the factory temperature gauge on applicable Volvo Penta inboard applications without additional wiring or electronics. Each Sierra sender is built and tested to meet or exceed the performance of the original equipment part it replaces.

The 18-7647 is designed for use in select Volvo Penta inboard engines, including 3.0, 4.3, 5.0, and 5.7 liter GL, GLP, GLM, GSP, and GSM engine variants from model years 1998-2007. It is interchangeable with Volvo Penta 872066 and Mallory 9-42407 temperature senders, making it a direct replacement option where those part numbers are called for. Confirm the sender matches your engine model and mounting thread before ordering, since sending units vary across engine families.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7647
• Material: Brass
• Item Dimensions: 6 x 1 x 6 inches
• Weight: 0.04 pounds
• Mounting Type: Screw-in
• Output Type: Analog
• Upper Temperature Rating: 260 degrees Fahrenheit
• Measurement Accuracy: plus or minus 1.5 percent
• Specific Uses For Product: Volvo Penta inboard engines
• Included Components: Temperature Sender
• Unit Count: 1
• UPC: 808282287474

Fitment

• Volvo Penta inboard engines: 4.3Gl-a, 4.3Gl-b, 4.3Gl-c, 4.3Gl-d, 4.3Gl-e, 4.3Gl-ef, 4.3Gl-g, 4.3Gl-gf, 4.3Gl-j, 4.3Gl-jf, 5.7Gl-a, 5.7Gl-b, 5.7Gl-c, 5.7Gl-d, 5.7Gl-e, 5.0Gl-a, 5.0Gl-b, 5.0Gl-c, 5.0Gl-d, 5.0Gl-e, 5.0Gl-f, 5.0Glff, 5.0Gl-h, 5.0Gl-hf, 5.0Gl-j, 5.0Gl-jf, 3.0Glp-a, 3.0Glp-b, 3.0Glp-c, 3.0Glp-d, 3.0Glp-e, 3.0Glp-j, 3.0Glp-n, 3.0Glm-a, 3.0Glm-b, 3.0Glm-c, 3.0Gsp-a, 3.0Gsp-b, 3.0Gsp-c, 3.0Gsm-a, 3.0Gsm-b, 3.0Gsm-c (1998-2007)

Replaces (OEM)

• Volvo Penta 872066
• Mallory 9-42407

Frequently Asked Questions

What engines does the Sierra 18-7647 temperature sender fit? The 18-7647 is designed for use in select Volvo Penta inboard engines, covering 3.0, 4.3, 5.0, and 5.7 liter GL, GLP, GLM, GSP, and GSM variants built from 1998-2007. Check your engine model code against the fitment list before ordering, since Volvo Penta used several sender variations across these engine families.

Is the 18-7647 interchangeable with the Volvo Penta 872066 sender? Yes, the Sierra 18-7647 is interchangeable with Volvo Penta part number 872066, so it can be used as a direct replacement wherever that OEM number is specified.

Does this sender cross over to any Mallory part number? Mallory 9-42407 crosses to the Sierra 18-7647, so either number will get you the same replacement temperature sender.

What material is the 18-7647 temperature sender made from? It is made from brass, chosen for its corrosion resistance in a marine engine compartment environment.

What is the maximum temperature the 18-7647 can read? The sender has an upper temperature rating of 260 degrees Fahrenheit, with a measurement accuracy of plus or minus 1.5 percent.

How does the 18-7647 mount to the engine? It uses a screw-in mounting type, threading directly into the engine block or cylinder head like the original sending unit.

Is the output from this sender analog or digital? The Sierra 18-7647 produces an analog output signal, matching factory-style analog temperature gauges on applicable Volvo Penta inboard engines.

What are the dimensions of the 18-7647 temperature sender? The sender measures 6 x 1 x 6 inches and weighs 0.04 pounds.

What is included when I order the 18-7647? Each order includes one Sierra 18-7647 temperature sender; no gauge or wiring harness is included.

Is the Sierra 18-7647 a genuine OEM part or an aftermarket replacement? The 18-7647 is a Sierra aftermarket replacement sender built to meet or exceed the performance of the original equipment part it replaces, including Volvo Penta 872066.

Will the 18-7647 work with any inboard engine, or only Volvo Penta? This sender is designed specifically for use in select Volvo Penta inboard engines rather than as a universal fit across all engine brands, so confirm your engine model against the fitment list first.

How do I know if I need the 18-7647 versus a different Sierra sender? Match your engine's model code (such as 4.3Gl-a or 5.7Gl-c) and confirm your existing sender is stamped Volvo Penta 872066 or Mallory 9-42407 before ordering the 18-7647, since Volvo Penta inboard engines used more than one sender design.