Replacement Isolator Grommet for Cummins ® B/ISB/QSB Applications Grommet Only

Product Details

Grommet – Isolator for Cummins Engine ? OEM Replacement MCB3959400

High-Quality Diesel Engine Part for Cummins Engine

This premium Grommet – Isolator is built to meet or exceed OEM specs for Cummins Engine diesel engines. Direct-fit replacement for MCB3959400.

Function & Importance

The Grommet – Isolator maintains key engine processes for efficiency and longevity. Failure leads to poor performance or breakdowns.

• OEM Ref: MCB3959400
• Engine Make: Cummins Engine
• Precision-engineered for durability
• Ideal for rebuilds or maintenance

Why Choose HDKits?

HDKits guides diesel techs with expert support, deep inventory, and fast fulfillment for repairs big and small.

FAQs

Q: What does the Grommet – Isolator do?
A: It ensures smooth engine operation, protecting against wear.

Q: How do I know if it needs replacing?
A: Look for odd noises, loss of power, or diagnostic codes. Contact HDKits if unsure.

Q: Can I install it myself?
A: Basic mechanical skills needed; consult a pro or HDKits experts if in doubt.

Application & Fitment

• Engine Make: Cummins
• Engine Model / Application: B/ISB/QSB

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

• Interstate-McBee Reference: MCB3959400

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.