Description
Product Video
1. Key Features & Benefits
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OEM cross references T407453 & 256-6454 – Direct replacement engine coolant temperature (ECT) sensor for Perkins C7.1 engines used in CAT336 and other C7.1‑powered excavators.
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Critical engine management component – Measures coolant temperature; ECU uses this data to adjust fuel delivery, injection timing, and fan speed. Also controls cold‑start enrichment and glow plug operation.
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Restores proper engine operation – A failing sensor causes hard starting, erratic idle, poor fuel economy, black smoke, or an inoperative cooling fan. Replace it to bring back normal engine behavior.
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Plug‑and‑play installation – 2‑pin connector, 18mm diameter, matches OEM fitment. No calibration required.
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OEM construction – Built to original specifications with corrosion‑resistant brass body and accurate NTC thermistor.
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Compact packaging – Shipped in protective paper box, ready for immediate installation.
2. Applications (Random Selection)
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Mechanical repair shops – Common failure on high‑hour C7.1 engines. Keep one in stock for cooling system diagnostics.
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Mining & quarrying – Dust and heat cycles stress the sensor; pre‑emptive replacement prevents overheating or cold‑start issues.
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Heavy construction – Excavators working in extreme temperatures need accurate coolant readings for proper fan control.
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Equipment rental fleet maintenance – Proactive sensor replacement avoids customer complaints about hard starting or overheating.
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Energy projects – Backup for C7.1 engines in generator or pump applications (check compatibility).
3. FAQ – Frequently Asked Questions
Q1: What are the symptoms of a bad coolant temperature sensor (T407453 / 256-6454)?
A: Common signs include: hard starting when cold, engine runs rich (black smoke), erratic idle, cooling fan running constantly (or not at all), poor fuel economy, or diagnostic codes related to coolant temperature (e.g., P0115, P0116, P0118).
Q2: Is this sensor compatible with all CAT C7.1 / Perkins C7.1 engines?
A: It fits most C7.1 engines with 2‑pin connector and 18mm thread. However, please verify your original part number. Send us a photo of the old sensor or your engine serial number – we will confirm within 2 hours.
Q3: Does this sensor require programming after installation?
A: No. The coolant temperature sensor is a simple resistive device. No ECU reprogramming is needed. However, we recommend clearing any stored temperature‑related codes after replacement.
Q4: Do you offer a warranty?
A: Yes, we provide a 6‑month warranty against manufacturing defects (thermistor drift, electrical failure, housing leaks). Damage from physical impact or coolant contamination is not covered.
Q5: What is the MOQ?
A: MOQ is 1 piece. Bulk orders welcome.
Q6: How long does delivery take?
A: 6–8 working days for most destinations. Express shipping (DHL/FedEx) is available.
Q7: What payment methods do you accept?
A: T/T, XTransfer, PayPal, Western Union.
Q8: Any installation tips?
A: Drain a small amount of coolant below the sensor level. Clean the threads and apply a small amount of thread sealant (do not use Teflon tape on the tip). Torque to 15–20 Nm. Reconnect the 2‑pin harness. Top up coolant and bleed air if necessary.
Warranty note: 6 months against manufacturing defects. Warranty does not cover damage from coolant leaks, physical impact, or improper installation.
Before ordering, send us a photo of your old sensor or engine serial number – we will confirm compatibility within 24 hours.
