How do I confirm pilotpart197644 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

For Cummins Cylinder Block

Cylinder Block 3938366 for Cummins

Q: What part numbers are associated with this Cylinder Block?

3938366, ISB4.5, QSB4.5, 4B3.9, 4BTA, QSB5.9, CM550

OEM / REF: 3938366SKU: pilotpart197644

Cummins Cylinder Block 3938366 is listed under Engine Spare Parts > Cylinder Block with catalog data including Part Number: 3938366. Verify fitment for Cummins Engine Spare Parts using the OEM number, mounting points, and photos of your existing part.

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

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$3,555.72USD/EA

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Oct 22 – Oct 29
10	Oct 20 – Oct 27
50	Oct 18 – Oct 25

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.

Cylinder Block Description

This Cylinder Block is indexed for Part Number. Compare reference number 3938366 against the label on your existing Cummins component before ordering.

Additional cross references on file: ISB4.5, QSB4.5, 4B3.9. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.

Part Numbers and Cross References

3938366 ISB4.5 QSB4.54B3.94BTAQSB5.9 CM550

Applications

Part Number

Specifications

Part Number	3938366

Fitment Notes

Brand or application signal: Cummins Engine Spare Parts
Product family: Cylinder Block
System category: Engine Spare Parts > Cylinder Components > Cylinder Block
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.