Cummins Noise Isolator 3935449
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Cummins 3935449 Noise Isolator is a genuine OEM Cummins component designed to reduce noise and vibration transfer in Cummins B-Series diesel engines. This isolator is used at mounting points where vibration dampening and acoustic isolation are required.
Key Features
- Genuine Cummins OEM noise isolator
- Part number: 3935449
- Reduces vibration and noise transfer at engine mounting points
- Designed for Cummins B-Series diesel engine applications
- Factory replacement for correct Cummins assembly
Engine Compatibility
Designed for use on Cummins B-Series diesel engines. Confirm fitment by engine serial number, CPL, and Cummins parts diagram location before ordering.
Serial Number Fitment Notice
Noise isolators are application-specific. Verify by engine serial number and diagram location before ordering, as similar isolators may differ by durometer, profile, or mounting configuration.
When This Part Needs Replacement
Replace this isolator if it is cracked, collapsed, hardened, or no longer providing adequate vibration dampening. A failed isolator can transmit excessive noise and vibration to the chassis or mounting structure.
Installation Notes
Install per Cummins torque specifications. Do not over-torque mounting hardware, as this can compress the isolator beyond its design range and reduce effectiveness.
Alternate/Superseded Part Numbers
- 3935449
Parts Desk Insight
Cummins lists this as a Noise Isolator — confirm the exact mounting location and application via engine serial number and parts diagram before ordering, as multiple isolator variants may exist for the same engine family.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.