Replacement Inner Valve Spring for Caterpillar ® 6.25"/D353/D379/D398/D399 Applications D353/D379/D398/D399 – 6.25 Bore OEM Cross References: 9M5349

Product Details

Spring – Valve – Inner | Caterpillar Engine | M-9M5349

Spring – Valve – Inner is an OEM-quality component designed for the Caterpillar diesel engine. Manufactured to meet or exceed original specifications, this part ensures reliable performance and long service life. OE reference: M-9M5349.

Each product from HeavyDutyKits.com is backed by our commitment to quality and compatibility, helping mechanics and fleet operators maintain top efficiency.

Features:

• Direct-fit replacement for Caterpillar OE M-9M5349
• Engineered for durability under high-load diesel conditions
• Ideal for rebuilds, maintenance, or performance upgrades

Order today from HeavyDutyKits.com ? your trusted source for heavy-duty diesel engine parts.

Application & Fitment

• Engine Make: Caterpillar
• Engine Model / Application: 6.25"/D353/D379/D398/D399

Confirm the original part number and engine identification before ordering. Where applicable, also verify serial-number range, production year, piston style, bearing size or other configuration notes shown in the product information.

Part Numbers & Cross References

• OEM Cross Reference: 9M5349
• Interstate-McBee Reference: M-9M5349

Need Help Confirming Fitment?

Use the engine model, serial number and original part number when checking compatibility. For kits and sets, review the complete component breakdown above before ordering because contents can vary by engine configuration.