How do I confirm pilotpart275197 fits my machine?

Compare the OEM or reference part number, machine model, engine model, and serial number. You can also submit a fitment inquiry before ordering.

In Stock

Engine Thermostat 3973835 3974371 4929644 5292712 for Cummins Engine QSB5.9 QSB

For Cummins Thermostat

Engine Thermostat 3973835 for Cummins QSB5.9 Engine

OEM / REF: 3973835SKU: pilotpart275197

Engine Thermostat 3973835 3974371 4929644 5292712 for Cummins Engine QSB5.9 QSB is a Engine Thermostat replacement part indexed for Cummins · QSB5.9 and Cummins · QSB, with 3 application records on file. Match OEM part number 3973835 and confirm fitment for Cummins Engine Spare Parts before ordering.

Stock: In stock
Condition: New
Fitment: Cummins Engine Spare Parts
Category: Thermostat

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$96.99USD/EA

~~$11,399.00~~Save 99%

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Oct 23 – Oct 30
10	Oct 21 – Oct 28
50	Oct 19 – Oct 26

Estimates from today; confirm exact lead time before payment.

Quantity

Buy online now or add to your quote list for bulk pricing and fitment confirmation.

Confirm fitment before ordering →

Lead times can vary by freight route and customs. Contact support for expedited shipping.

Thermostat Description

This Thermostat is indexed for Cummins · QSB5.9; Cummins · QSB; Cummins s: Cummins Engine: QSB5.9, QSB. Compare reference number 3973835 against the label on your existing Cummins component before ordering.

Additional cross references on file: 3974371, 4929644, 5292712. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.

Part Numbers and Cross References

3973835 3974371 4929644 5292712

Applications

Cummins · QSB5.9
Cummins · QSB
Cummins s: Cummins Engine: QSB5.9, QSB

Specifications

Part Number	3973835, 3974371, 4929644, 5292712

Fitment Notes

Brand or application signal: Cummins Engine Spare Parts
Product family: Thermostat
System category: Engine Spare Parts > Lubrication & Cooling Systems > Thermostat
Recommended verification: OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability: InStock
Shipping: Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns: Returns are easier when fitment is confirmed before ordering.
B2B support: Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.