CATEngine Parts

8F8521 Balance Shaft Bushing — Cat Engine: D339

This balance shaft bushing is a crucial component within the engine's lubrication and rotational balance system, designed to support the balance shaft. Manufactured to meet high-durability standards, it provides a low-friction bearing surface essential for smooth engine operation and longevity, unlike worn bushings that can cause excessive play. Operators might notice increased engine vibration, unusual knocking sounds from the engine block, or a drop in oil pressure if these bushings begin to fail.

Balance Shaft Bushing – Part No 8F8521 – 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 TypeBalance Shaft Bushing
MaterialBronze alloy
ApplicationEngine balance shaft support
Service LifeDesigned for full engine life cycle
CompatibilityCAT D339 Engine
ConditionNew — CTP aftermarket replacement

Failure Symptoms

Early signs of bushing failure include a subtle increase in engine vibration, particularly at certain RPMs. As wear progresses, this vibration can become more pronounced, accompanied by potential knocking noises from the engine. Severe wear can lead to improper balance shaft rotation, impacting overall engine smoothness and potentially causing secondary component damage.

Installation Tip

Ensure the bore in the engine block is meticulously cleaned and free from any old material or burrs before pressing in the new bushing. Do not attempt to drive the bushing in at an angle, as this can damage the bushing or the block.

Service Note

Inspect the balance shaft for any signs of scoring or wear that could prematurely damage the new bushings.