Sierra Temperature Sender 18-5897, Replaces 97257A1, for MCM/MIE Stern Drive Engines

The Sierra 18-5897 Temperature Sender is an engine temperature sending unit built for Mercruiser stern drive applications, specifically MCM/MIE engines. It converts coolant temperature into an electrical signal that is read by the engine's temperature gauge, giving the operator a real-time reading of engine operating temperature. The sender uses Sender Code D and is rated to an upper temperature of 240 degrees Fahrenheit, with a split temperature range for accurate mid-range readings as well as high-temperature warning detection.

It threads into the engine block or cylinder head using a 3/8 inch or 9.5mm -18 NPT thread and connects to the gauge wiring through a 10-32 stud terminal, making it a straightforward engine-mount replacement for the factory sender. As a direct fit for the original equipment part it replaces, it restores accurate temperature gauge readings without requiring changes to existing wiring or gauge hardware.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5897
• Product Type: Temperature Sender
• Sender Code: D
• Thread Size: 3/8 inch or 9.5mm -18 NPT
• Terminal Type: 10-32 stud
• Temperature Range: 240 degrees Fahrenheit, split range
• Upper Temperature Rating: 240 degrees Fahrenheit
• Mounting Type: Engine mount
• Output Type: Electrical signal
• Item Dimensions: 4 x 0.75 x 5.12 inches
• Weight: 0.04 pounds
• UPC: 030999563880
• Fits: MCM/MIE engines
• Warranty: 90 days

Fitment

• Mercruiser stern drive applications, MCM/MIE engines

Replaces (OEM)

• 97257A1

Frequently Asked Questions

What engines does the Sierra 18-5897 temperature sender fit? The Sierra 18-5897 is designed for Mercruiser stern drive applications, specifically MCM/MIE engines.

What OEM part number does the 18-5897 cross-reference? It replaces OEM number 97257A1, so it is a direct substitute for that original part.

What thread size does this sender use? The 18-5897 uses a 3/8 inch or 9.5mm -18 NPT thread for installation into the engine block or cylinder head.

What terminal type connects to the gauge wiring? A 10-32 stud terminal is used to connect the 18-5897 sender to the existing gauge wiring.

What temperature range does the sender read? The Sierra 18-5897 has a split temperature range with an upper rating of 240 degrees Fahrenheit.

Is the 18-5897 a direct replacement for the factory sender? Yes, the 18-5897 is built as an engine-mount replacement that matches the fit and function of OEM number 97257A1, requiring no wiring or gauge changes.

How much does the Sierra 18-5897 weigh? The temperature sender weighs 0.04 pounds.

What are the physical dimensions of the 18-5897? It measures 4 x 0.75 x 5.12 inches.

What is the sender code for the 18-5897? This unit is identified as Sender Code D.

What does this sender output? The 18-5897 converts engine coolant temperature into an electrical signal that is sent to the temperature gauge.

Where does the temperature sender mount on the engine? The 18-5897 is an engine-mount sender that threads directly into the engine using its 3/8 inch or 9.5mm -18 NPT thread.

What warranty comes with the 18-5897? The Sierra 18-5897 temperature sender is backed by a 90-day warranty.