Thermometer Unit 8-94237861-0 8-94235691-0 For ISUZU TFR54 4JA1 Engine

The Thermometer Unit (OEM Numbers: 8-94237861-0 / 8-94235691-0 / 8942378610 / 8942356910) is a premium-quality, direct replacement coolant temperature sending unit designed specifically for ISUZU TFR54 and various light-duty truck models equipped with 4JA1 diesel engines. This essential engine sensor monitors coolant temperature and transmits an electrical resistance signal to the dashboard temperature gauge, providing accurate engine temperature readings for safe and reliable operation.

• OE Quality: Manufactured to strict ISUZU dimensional and electrical specifications for perfect fit and function
• Accurate Temperature Reading: Precision resistance characteristics ensure correct dashboard gauge calibration
• Corrosion-Resistant Construction: Brass or high-grade metal housing resists corrosion from coolant and engine environment
• Vibration-Proof Design: Robust construction withstands engine vibration for reliable long-term service
• Prevents Overheating Damage: Accurate temperature monitoring allows early detection of cooling system issues
• Restores Gauge Function: Eliminates erratic, false, or no temperature readings on the dashboard
• Direct Replacement: Simple screw-in installation - no modification required
• Sealed Construction: Protects internal electrical components from moisture and contamination
• Cost-Effective Repair: Affordable component that restores critical engine monitoring function

This thermometer unit is specifically designed for ISUZU trucks and equipment using 4JA1 engines with the corresponding instrument cluster. Common applications include:

• ISUZU TFR54 (Pickup / Utility Vehicle)
• ISUZU NKR (Light-Duty Trucks)
• ISUZU 4JA1 Engine Specifications:
  • 4-Cylinder, Inline Diesel
  • Displacement: 2.5L
  • Valvetrain: OHV
  • Application: Pickups, light trucks, and industrial use
• Also compatible with various ISUZU models using the same temperature sender unit

Professional mechanic installation recommended:

1. Ensure engine is cool - Never work on the cooling system when the engine is hot to avoid burns
2. Drain coolant if necessary - Partially drain coolant from the radiator until level drops below the sender mounting location
3. Locate the temperature sender - Typically mounted on the cylinder head, thermostat housing, or intake manifold
4. Disconnect the electrical connector - Carefully unplug the wire terminal from the old sender
5. Remove the old sender - Use a deep socket or wrench to unscrew the old thermometer unit from its mounting
6. Clean the mounting threads - Clean any debris, old sealant, or corrosion from the threaded hole
7. Apply thread sealant - Apply a small amount of thread sealant or PTFE tape to the new sender threads (avoid the sensing tip)
8. Install the new sender - Screw in the new thermometer unit hand-tight, then torque to manufacturer specifications
9. Reconnect the electrical connector - Plug the wire terminal securely onto the new sender
10. Top up coolant - Refill the cooling system to the correct level
11. Check for leaks - Start the engine and inspect the sender mounting area for any coolant seepage
12. Test gauge operation - Observe the dashboard temperature gauge as the engine warms up to ensure accurate reading

• Resistance Calibration: Each unit tested to ensure resistance values match OE specifications for accurate gauge reading
• Material Verification: Confirms housing material meets corrosion resistance and durability specifications
• Seal Integrity Testing: Leak-tested to ensure no coolant bypass around threads
• Dimensional Inspection: Thread size, length, and terminal configuration verified for exact fit
• Thermal Response Testing: Sampling tested for proper response time to temperature changes
• Visual Inspection: 100% checked for molding defects, thread damage, or terminal deformation
• Packaged Safely: Protected and packaged to prevent damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea