CATEngine Parts

142-1987 Belt Tensioner — Cat Engine C 10 C 12

This belt tensioner is an engine accessory that automatically maintains the correct tension on the serpentine or V-belt driving various engine components like the alternator and water pump. It is manufactured to meet OEM specifications, ensuring consistent belt pressure for optimal accessory performance and preventing premature belt wear, unlike a worn tensioner that allows excessive belt slack. Operators may notice a squealing noise from the belt area, premature belt wear, or a lack of charging system output when the belt tensioner fails.

Belt Tensioner – Part No 142-1987 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeBelt Tensioner Assembly
MaterialSteel and durable spring mechanism
ApplicationCAT C-10 C-12 Engine Belt Drive
Service LifeReplace every 100,000 miles or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common initial symptom of a failing belt tensioner is an audible squealing or chirping noise from the engine's accessory drive belt. If left unaddressed, this can lead to the belt slipping intermittently, causing reduced performance of driven accessories like the alternator or water pump. The ultimate consequence is belt failure, potentially leading to overheating or a dead battery.

Installation Tip

Before installing, ensure the mounting surfaces are clean and that the new tensioner arm moves freely without binding. Do not use excessive force to retract the tensioner arm during installation, as this can damage the internal spring mechanism.

Service Note

Inspect the condition of the drive belt and all driven accessory pulleys for wear or damage when replacing the belt tensioner.