Worldwide Shipping
New CAT 3S6638 (5M2788) Nozzle Caterpillar Aftermarket for Caterpillar
- New Nozzle Replacement suitable for Caterpillar Equipment
- Made to USA Specification
Buy with Confidence: All parts are covered by our warranty
Exact Fit Guarantee
This part is guaranteed to fit your machine.
Wrong Part?
We'll overnight correct part at no cost to you.
Description for 3S6638 Nozzle
â–¶Specification for 3S6638 Nozzle
â–¶Exact Fit Guarantee for 3S6638 Nozzle
â–¶| Models | D333C, 3306 |
|---|---|
| Dimensions | 3x3x3 |
-
prompt clear replies
-
Very prompt services !
-
Great customer service.
Prompt , knowledgeable and friendly service. -
I own old cat bulldozers D8k,D8H,D8N that required frequent repairs and servicing. it was erratic and practically cumbersome to keep them running without constant supply of reliable
and affordable spares in Uganda a third world country however,since I started dealing with propel parts US,my bulldozers have earned reliability and efficiency in providing high quality services to clients and making me a great dependable construction company in earth moving.
My shipments are always handled expeditiously and delivered in record time to Uganda this is awesome from Propelparts.
My business is booming by the clock for finding the best partner in Propelparts. -
I’ve been ordering parts from propel for about 3 years & counting. I live in Hawaii where we have a hard time getting parts especially for decent prices with fast shipping. I've been 100% satisfied with the company and the customer service and will continue to use them. I recommend propel to everyone here in Hawaii and we are all happy to have you guys. Thank you!!!
Frequently Asked Questions
What is the function of the CAT 3S6638 (5M2788) nozzle?
The CAT 3S6638 (5M2788) fuel injector nozzle is designed to deliver a precise spray of fuel into the combustion chamber. This ensures efficient fuel atomization, proper combustion, and optimal engine performance. A well-functioning nozzle helps maintain power output while reducing fuel waste and emissions.
Which Caterpillar engines are compatible with the 3S6638 (5M2788) nozzle?
The 3S6638 (5M2788) nozzle is commonly used in Caterpillar engines such as the D333C and 3306. However, compatibility can vary based on your specific machine configuration. Always check your equipment manual or part number reference. If you are still unsure, reach out to Propel Parts, our team will be happy to help you verify if this part fits your equipment.
Does this 3S6638 nozzle meet OEM performance standards?
Yes, this is a premium aftermarket nozzle designed to meet OEM specifications and deliver reliable performance under demanding conditions. When replacing, choose genuine or high-quality aftermarket parts that meet or exceed OEM specifications to ensure durability and consistent engine operation.
How do I install the Caterpillar 3S6638 nozzle?
Follow these basic steps for proper installation:
- Turn off the engine and allow it to cool completely
- Relieve fuel system pressure according to your manual
- Remove the injector assembly carefully
- Replace the old nozzle with the new one
- Reassemble and torque components to manufacturer specifications
- Restart the engine and check for leaks or irregular performance
Proper installation helps ensure optimal fuel delivery and long-term reliability.
What are the signs of a failing or clogged fuel injector nozzle?
Common symptoms of a worn or clogged nozzle include:
- Poor engine performance or power loss
- Increased fuel consumption
- Rough idling or misfiring
- Excessive smoke from the exhaust
- Hard starting or delayed ignition
Routine inspection and timely replacement can help prevent costly engine issues.
How often should the 3S6638 injector nozzle be replaced?
Replacement intervals depend on operating conditions, fuel quality, and maintenance schedules. In heavy-duty or high-contamination environments, nozzles may require more frequent servicing. Regular maintenance ensures consistent fuel delivery and protects engine components.
Why is fuel injector nozzle quality important for Caterpillar engines?
The injector nozzle plays a critical role in fuel efficiency and combustion accuracy. Using a high-quality nozzle helps maintain engine power, reduce emissions, and prevent internal damage. When replacing, choose genuine or high-quality aftermarket parts that meet or exceed OEM specifications for long-term performance and reliability.
Can I use an aftermarket 3S6638 nozzle instead of an original part?
Yes, a premium aftermarket 3S6638 (5M2788) nozzle is a reliable alternative when it is manufactured to meet OEM specifications. High-quality aftermarket options provide dependable performance, durability, and value, making them a practical choice for maintaining your Caterpillar engine.
This 3S6638 Nozzle is compatible with the following models:
D333C, 3306 & more...
Shipping
We know equipment downtime costs money, so fast and reliable shipping is a priority at Propel Parts. Orders placed on weekdays before 3:00 PM ET typically ship the same day, with expedited delivery options available for many locations when time is critical.
We ship across the U.S., Canada, and over 130 countries worldwide, helping customers keep machines running wherever they operate. Available shipping methods and delivery estimates are shown at checkout so you can select the option that best fits your timeline.
Tracking information is emailed within 24–48 hours after your order is processed, giving you full visibility from dispatch to delivery and peace of mind that your parts are on the way.
Easy Returns
Our refund policy is simple. We offer a 30-day, no-hassle return policy, and we make every effort to provide the best service and highest-quality parts possible. If you’re not fully satisfied with your purchase, you may return it within 30 days for a refund. Full details are available on our Returns Policy page.
Warranty
Buy with confidence. All parts from Propel Parts are covered against material or manufacturer defects for 12 months from the original invoice date. We stand behind every part we sell, so you can count on reliable performance and dependable support. Full details are available on our Warranty Policy page.
Exact Fit Guarantee®
The right part — or we'll make it right.
Order Normally
Know your part number? Simply place your order.
Not Sure?
Place your order, then send us your serial number before it ships.
We'll verify fit.
We Make It Right
Wrong part? We'll make it right.Fast. At our expense.
1 YEAR UNLIMITED WARRANTY
ORDER BY 3PM EST. EXCL. WEEKEND
NO CORE OR EXCHANGE CHARGES
EASY RETURNS & FAST REFUNDS
