CATEngine Parts

266-6321-2666321 Muffler U Bolt 266 6321 — Cat 3066 320C

This muffler U-bolt is designed to securely fasten the exhaust muffler to the vehicle's chassis or exhaust system, preventing vibration and leaks. Constructed from durable, corrosion-resistant steel, it maintains a tight grip unlike a stretched or rusted original bolt. Symptoms of a failing U-bolt include excessive exhaust noise, rattling sounds from the undercarriage, or visible looseness of the muffler assembly.

Muffler U Bolt 266 6321 – Part No 266-6321-2666321 – 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 TypeMuffler U-Bolt
MaterialSteel
ApplicationExhaust System Mounting
Service LifeReplace as needed due to corrosion or damage
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A loose or broken U-bolt will first be noticeable as a loud rattling or buzzing sound from the exhaust system, particularly during engine acceleration. If left unaddressed, the muffler could become significantly detached, leading to exhaust leaks and potential damage to surrounding components. The ultimate risk is the muffler separating completely, causing immediate and severe exhaust system failure.

Installation Tip

Clean the mounting surfaces and threads thoroughly before installing the new U-bolt to ensure a secure fit and prevent corrosion. Do not overtighten, as this can damage the muffler or the bolt itself.

Service Note

Inspect the muffler, exhaust pipes, and mounting brackets for signs of corrosion or damage when replacing the U-bolt.