805223T Air Charge Temperature Sensor for Mercruiser Volvo Penta V6 V8 MPI | JLM Marine

Air Charge Temperature Sensor for Mercruiser Volvo Penta V6 V8 MPI – Replaces 805223T

This Intake Air Temperature (IAT) Flame Arrestor Sensor Assembly is designed for MerCruiser and Volvo Penta marine engines, including V6 and V8 MPI models. It provides accurate air temperature readings to optimize fuel delivery and engine performance in demanding marine environments.

This aftermarket sensor directly replaces Mercury MerCruiser 805223T, Volvo Penta 3854527, and Sierra Marine 18-7702, offering broad compatibility across most Volvo Penta and MerCruiser models.

• Fits MerCruiser V6 & V8 engines including 350, 454, 496, and 502 MPI
• Compatible with 7.4L (1994–2000) and 8.1L (2005–Current) models
• Flame arrestor sensor assembly for reliable intake air temperature monitoring

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

Your package includes:

• 1 × Air Charge Temperature Sensor (IAT Flame Arrestor Sensor Assembly)

Installation Guide

1. Disconnect the battery to prevent electrical shorts during installation.
2. Locate the existing IAT sensor on the flame arrestor or intake manifold of your MerCruiser or Volvo Penta engine.
3. Disconnect the electrical connector from the old sensor by pressing the release tab and pulling gently.
4. Remove the old sensor by unscrewing it counterclockwise from the flame arrestor assembly or mounting location.
5. Inspect the mounting threads and clean any debris or corrosion to ensure a proper seal.
6. Install the new sensor by threading it clockwise into the mounting location. Hand-tighten initially to avoid cross-threading.
7. Torque to manufacturer specifications (typically 8–12 ft-lbs) using a torque wrench—do not over-tighten.
8. Reconnect the electrical connector to the new sensor until you hear or feel a click, confirming a secure connection.
9. Reconnect the battery and turn the ignition to the "ON" position (do not start the engine yet).
10. Check for any warning lights or error codes on the instrument panel.
11. Start the engine and verify that it runs smoothly without hesitation or rough idle.
12. Perform a brief test run and monitor engine performance to confirm proper sensor operation.

Troubleshooting & FAQ

Q: How do I confirm this sensor fits my engine?
A: Cross-reference your original part number (MerCruiser 805223T, Volvo Penta 3854527, or Sierra 18-7702) with the table above. Verify your engine model (V6/V8 MPI, 7.4L 1994–2000, or 8.1L 2005–Current) against the compatibility list.

Q: What are the symptoms of a failing air charge temperature sensor?
A: Common signs include rough idle, poor fuel economy, hesitation during acceleration, black smoke from the exhaust, or check engine lights/error codes related to air intake temperature.

Q: Can I install this sensor myself or do I need a professional?
A: Installation is straightforward if you have basic mechanical skills and tools. However, professional installation is recommended to ensure proper torque settings, electrical connections, and to avoid damage to the flame arrestor assembly.

Q: How often should I replace the air charge temperature sensor?
A: IAT sensors typically last many years under normal conditions. Replace immediately if you experience symptoms of failure or if diagnostic codes indicate sensor malfunction. Inspect annually during routine maintenance.

Q: Is this an OEM or aftermarket part?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.