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New 1167221 Seal Replacement suitable for Caterpillar 3408, 3408C, 3408E, 3412D, 3412E
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Description for 1167221 Seal Ring
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Customer Reviews
A Delay Handled the Right Way
Honestly, if I were in Miami like my shipment was, I wouldn?t have been in a hurry to ship out either. I was frustrated at first ? delays cost me time on the job ? but Propel Parts stepped up.
Deb, Daniel and the team owned the mistake, kept the communication clear, and graciously refunded my shipping costs without making it a hassle. That kind of accountability is rare these days, and I genuinely appreciated how they handled it.
Things don?t always go perfectly, but these folks proved they?re more interested in doing right by their customers than just pushing parts out the door. Solid company, solid people.
? Jimmy Spong
Hartco Mobile Welding
P.S. Incredible quality on the pin as well. I had to do some custom modifying, and let?s just say the case hardening was ? well ? hard. Great Stuff! Thank you.
Steven & Propel Parts were a huge help! We were able to place a large order and get it shipped out same day to avoid a line down situation for a customer due to a lost component. The order was even submitted after the 3pm cutoff for same day shipments and we got it the next morning!
Propel Parts provided quality parts for my Caterpillar needs at a very fair price. Shipping to my international location was very fast. took about a week for the parts to get here. Seller is also responsive with my inquiry.
Thanks again
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.
Great service at an affordable price to get my machine back going.
Been buying from them for years and have almost never had an issue. The few times I had a question or something to handle, they have shown amazing customer service. Great product and a great company.
Great customer services, the best
They are great !
He was a great help with ordering and refunding the sales tax,
GREAT CUSTOMER SERVICED
WANTED TO THANK PROPEL PARTS FOR THEIR ATTENTION TO AN URGENT MATTER I HAD. THEY RESPONDED QUICKLY & RESOLVED IT. I ALSO WANTED TO MENYTION THAT OUR CUSTOMER'S ARE VERY HAPPY WITH THE PARTS EWE HAVE BEEN ORDERING FROM PROPEL. WE WILL DEFINITLEY CONTINUE TO DO BUSINESS.
Product Questions
Frequently Asked Questions
What is the Caterpillar Seal 1167221?
The 1167221 is a critical sealing component used in Caterpillar 3408, 3408C, 3408E, 3412D, and 3412E engine series. It prevents oil or fluid leaks in high-pressure engine environments, protecting internal components from contamination and fluid loss.
Which engines is the 1167221 seal compatible with?
This seal is designed specifically for the Caterpillar 3408, 3408C, 3408E, 3412D, and 3412E engine series. Always confirm fitment using your engine serial number and parts manual. 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.
What are the symptoms of a failing engine seal?
Look for these warning signs:
- Engine oil or coolant leaking near the seal location
- Unusual burning oil smell during operation
- Dropping oil levels without a clear external leak
- Contamination of coolant with oil (milky appearance)
Early seal replacement prevents serious internal engine damage.
What is the 1167221 seal made from?
This seal is constructed from high-performance elastomer or PTFE-based materials that are engineered to handle the temperature extremes and chemical exposure inside heavy diesel engines. It meets or exceeds OEM specifications for the 3400 and 3412 engine families.
How do I properly install the 1167221 seal?
Before installation:
- Clean and inspect the seal bore for any damage or scoring
- Lightly lubricate the seal lip with clean engine oil
- Press the seal squarely into position using a seal driver tool
- Avoid using excessive force that could distort the sealing lip
Refer to your engine service manual for the exact installation depth and torque specs.
Is this a high-quality aftermarket seal for Caterpillar 3400 series engines?
Yes. The 1167221 from Propel Parts is a premium aftermarket seal designed to meet or exceed OEM performance expectations for the 3408 and 3412 engine series. It provides the same sealing reliability as the original part.
For a complete sealing solution, browse our full collection of seals and gaskets for Caterpillar engines.
What other parts are typically replaced alongside the 1167221 seal?
During a seal replacement on 3400/3412 series engines, it's common to also replace gaskets, O-rings, and related sealing components in the same service area to ensure a complete, leak-free repair.
Consider using a comprehensive seal kit to address all sealing points in the same repair.
Compatible Models
This 1167221 Seal Ring is compatible with the following models:
3408, 3408C, 3408E, 3412D, 3412E & more...
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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.
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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.
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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.
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