Quick On Start Thermo Switch for Isuzu NKR55 with 4JB1 Diesel Engine - Brass/Plastic Housing Direct Replacement

Name: Quick On Start Thermo Switch for Isuzu NKR55 with 4JB1 Diesel Engine - Brass/Plastic Housing Direct Replacement
Brand: Yimi (Guangzhou) Automotive Parts Co, Ltd
SKU: ISUZU NKR55
Availability: InStock

Basic Properties

Place of Origin: China

Brand Name: YIMI

Certification: ISO/TS16949

Model Number: ISUZU NKR55

Trading Properties

Minimum Order Quantity: 10 pcs

Price: Negotiable

Payment Terms: T/T,

Supply Ability: 10000 pcs/month

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Specifications

Part No:	8-94457511-0, 8944575110, 8-94121152-1, 8941211521	Engine Application:	ISUZU 4JB1 (2.8L Diesel)
Connector Type:	1-pin Or 2-pin (OE Specific)	Material:	Brass / Plastic Housing, Temperature-sensing Element
Cooling Type:	Engine Coolant Circulation	Installation:	Direct OEM Replacement
Displacement:	2.8L (2771cc)	Thread Size:	Tapered Or Straight Threads (OE Specific)
High Light:	Quick On Thermo Switch for Isuzu NKR55 , Brass housing thermo switch 4JB1 engine , Direct replacement thermo switch Isuzu diesel

Product Description

Quick On Start Thermo Switch 8-94457511-0 For Isuzu NKR55 4JB1 8944575110 Isuzu Truck Parts

Function: Quick On Start (QOS) thermo switch controls the glow plug pre‑heating duration based on coolant temperature. Enables reliable cold starts and reduces white smoke for Isuzu 4JB1 diesel engines.

Product Specifications

Part Number	8-94457511-0, 8944575110, 8-94121152-1, 8941211521
Product Name	Quick On Start Thermo Switch / QOS Switch / Glow Plug Thermal Switch
Car Model	ISUZU NKR55
Engine Model	ISUZU 4JB1 (2.8L Diesel)
Condition	100% Brand New
Origin	China Mainland
Warranty	6 Months
Material	High-strength aluminum alloy & precision bearings
Cooling Type	Engine coolant circulation

Quick On Start Thermo Switch for Isuzu NKR55

Features & Advantages

OE Quality: Manufactured to Isuzu dimensional and electrical specifications for perfect fit and accurate temperature sensing
Precise Switching: Controls glow plug pre‑heating time based on actual coolant temperature
Fast Cold Starts: Ensures proper pre‑glow duration for easy starting in cold weather
Durable Construction: Corrosion-resistant materials withstand coolant and temperature extremes
Restores Starting Performance: Eliminates hard starting, excessive glow plug cycling, or no pre‑heat
Direct Replacement: Simple screw-in installation - matches OE thread and connector
Cost-Effective: Affordable alternative to genuine Isuzu switches

Thermo Switch technical details and installation

Vehicle & Engine Compatibility

This Quick On Start thermo switch is specifically designed for Isuzu NKR55 trucks with 4JB1 engine.

Isuzu Truck Models:

ISUZU NKR55 (light-duty truck, 4JB1 engine)
May also fit other Isuzu models with 4JB1 engine (e.g., NPR, TFR) - verify compatibility

Engine Specification - ISUZU 4JB1:

4-Cylinder, Inline Diesel, OHV
Displacement: 2.8L (2771cc)

Installation Notes

Installation steps (typical for QOS thermo switch):

Disconnect battery negative cable
Drain coolant to a level below the switch mounting location
Disconnect the electrical connector from the old switch
Remove the old switch using a wrench
Clean the threads in the cylinder head or thermostat housing
Apply thread sealant to the new switch (if tapered threads) or use a new sealing washer (if straight threads)
Install the new switch and tighten to specification (typically 15-25 Nm). Do not overtighten
Reconnect the electrical connector
Refill coolant and bleed the system
Reconnect battery
Start engine and check for leaks. Test cold start operation (when engine cooled down)

Quality Control

Temperature Test: Each switch tested for opening/closing at specified temperature range
Electrical Test: Continuity and switching function verified
Dimensional Inspection: Thread size, connector pin alignment, and housing dimensions verified
Leak Test: Sealing integrity checked
Visual Inspection: 100% checked for defects
Packaged Safely: Sealed in plastic bag, boxed with foam

Packaging and Delivery

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

For pricing, availability, or bulk purchase of the Quick On Start Thermo Switch 8-94457511-0 For Isuzu NKR55 4JB1 8944575110 Isuzu Truck Parts, please contact our sales team for a competitive quote and expert technical support.