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M-1P3748 (Gasket Kit - Overhaul)

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Regular price $1,276.84
Sale price $1,276.84 Regular price $1,344.04
Shipping calculated at checkout.

Additional Info: Shipping | Returns & Refund | Warranty

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Caterpillar® | 6.25"/D353/D379/D398/D399

High quality gaskets are crucial for ensuring a reliable seal between engine components and should be replaced regularly to prevent leaks and maintain optimal performance. These high-quality sets ship complete with all the necessary gaskets for your rebuild or repair and are backed by our comprehensive warranty.
Engineered for reliability, these replacement parts are compatible with 6.25"/D353/D379/D398/D399 applications. This series of engines covers a wide range of uses from construction to marine to mining, and more. The durable design and ease of maintenance has made this family of high displacement engines popular across the world.

Product Image Notice: For representation purposes only. Component colors or exact packaging layouts may vary while maintaining identical OEM fitment.



Specifications

Part Number

M-1P3748 (Gasket Kit - Overhaul)

Vendor

Interstate-McBee® (Aftermarket)

Condition

New

OEM Brand Fitment

Caterpillar®

Engine Model

6.25"/D353/D379/D398/D399

Shipping Dimensions

Length (in)

49.0

Width (in)

17.0

Height (in)

2.0

Weight (lb)

11.41

Notes

Dimensions shown are for shipping and packaging purposes only. Actual product dimensions may vary.

Processing & Delivery Timeline

Processing Time

1–3 Business Days

Shipping Transit Time

1–5 Business Days

Total Estimated Delivery

2–8 Business Days

Shipping Policy

Click Here

Warranty

Warranty

2 Year

Warranty Policy

Click Here

Kit Contents

Part # Description Qty
M-0L364 Lock 26
M-1S4295 Turbocharger Gasket 1
M-5L4940 Manifold Gasket 6
M-5L5032 O-Ring Seal 1
M-5M3351 Lock Nut 1
M-5M6038 Seal 2
M-5M9736 Oil Seal 1
M-5S1770 Lock Nut 6
M-6B831 Gasket 2
M-6B8241 Gasket 1
M-6B9186 Weight Group Gasket 2
M-6F1069 O-Ring Seal 6
M-1S4810 Turbocharger Oil Supply Gasket 1
M-6F6234 Fuel Pump Housing Lock 1
M-6F8146 O-Ring Seal 1
M-6F9163 Oil Filter Washer 4
M-6H6849 Gasket 1
M-6H9949 Gasket 1
M-6L3397 Gasket 1
M-6L3399 Gasket 2
M-6L3400 Gasket 1
M-6L3402 Gasket 1
M-1S6595 Turbocharger Oil Supply Gasket 1
M-6L4905 O-Ring Seal 1
M-6L5038 Gasket 1
M-6L5362 Air Comp Gasket 2
M-6L5363 Gasket 1
M-6L5369 Gasket 2
M-6L5386 Gasket 1
M-6L5435 Gasket 2
M-6L5436 Gasket 2
M-6L5457 Gasket 1
M-6L5458 Gasket 1
M-2A582 Housing Cover Gasket 1
M-6L5460 Gasket 1
M-6L5461 Gasket 1
M-6L5473 O-Ring Seal 1
M-6L5490 Cylinder Block Cover Gasket 2
M-6L7815 O-Ring Seal 18
M-6L7816 O-Ring Seal 6
M-7B305 O-Ring Seal 1
M-7B7129 Gasket 1
M-2A1913 Gasket 1
M-7F2836 Auxiliary Pump Lock 1
M-7F7510 Lock Nut 4
M-7F7590 Oil Lines Group Gasket 1
M-7H905 Gasket 1
M-7H1662 Gasket 1
M-7H3070 Lock Nut 6
M-7H7091 Gasket 1
M-7H7097 Housing Cover Gasket 1
M-7H7208 Gasket 1
M-2A2209 Accelerator Lock 1
M-7M875 Gasket 1
M-7M878 Gasket 1
M-7M879 Gasket 1
M-7M6843 Gasket 1
M-7M6844 Gasket 1
M-7M7205 Lock 13
M-7M9919 Lock - Bolt 3
M-7N3034 Gasket 1
M-8F4099 Gasket 1
M-8F8682 Screw Lock 3
M-2A3307 Lube Pump Seal 7
M-8M2970 Cylinder Head Gasket 2
M-8M4987 O-Ring Seal 2
M-8M5251 O-Ring Seal 12
M-8N2746 Gasket 1
M-8N2748 Gasket 1
M-8N7892 Alternator Gasket 2
M-9F1490 Nut - Lock 2
M-9M57 Rubber Washer 1
M-9M2266 Gasket 2
M-9M3866 Gasket 1
M-2A3885 Bleeder Valve Gasket 1
M-9M7002 O-Ring Seal 4
M-9M7660 Gasket 1
M-9M9545 O-Ring Seal 1
MCB6B6224 Ferrule & Seal Assembly 24
MCB7B2420 Ferrule & Seal Assembly 16
M-2A5328 Lock 7
M-2B1738 Screw Lock 2
M-0L1124 Drain Plug Gasket 1
M-2B6924 Gasket 1
M-2H4739 Lock 2
M-2L3451 Gasket 1
M-2L3549 Oil Pan Gasket 2
M-2L3565 Gasket 1
M-2M4453 O-Ring Seal 6
M-2M5173 Turbocharger Flange Seal 1
M-2M5177 Gasket 1
M-2M5190 Gasket 2
M-2M8663 O-Ring Seal 6
M-0L1213 Gasket 6
M-2N5843 Packing 6
M-2S3966 Ring 1
M-3H2420 Gasket 1
M-3H4970 Accessory Drive Seal 1
M-3H5939 Expansion Tank Gasket 1
M-3H5946 Gasket 1
M-3L5686 Strip Lock 2
M-3S1427 O-Ring Seal 1
M-3S3535 Seal 1
M-3S5453 Gasket 2
M-0S1922 Lock 1
M-4B7054 Lock Nut 4
M-4B8407 Flat Washer 1
M-4F5607 Transmission Ring Seal 6
M-4F5675 O-Ring Seal 2
M-4F7952 Hydraulic Seal 1
M-4F9325 Gasket 2
M-4H569 Lock Nut 3
M-4H693 Gasket 1
M-4H1722 Oil Seal 1
M-4H1857 Gasket 2
M-0T290 Lock 1
M-4H1945 Gasket 1
M-4H2494 Sleeve 11
M-4H2719 Gasket 1
M-4H3376 Gasket 1
M-4L1267 Gasket 1
M-4L3848 Thermostat Seal 1
M-4L4860 Gasket 2
M-4L7935 Gasket 1
M-4L7937 Gasket 1
M-4L8337 Air Compressor O-Ring Seal 2
M-1C155 Lock 7
M-4L9556 Gasket 1
M-4L9564 Breather Group Seal 4
M-4N7526 Seal 1
M-4S9155 Gasket 2
M-5B3718 O-Ring Seal 6
M-5B5980 Gasket 1
M-5B6031 Gasket 2
M-5B9656 Gasket 1
M-5F7054 O-Ring Seal 2
M-5H1032 Gasket 1
M-1F3131 Gasket 2
M-5H1039 O-Ring Seal 4
M-5H1190 Seal 4
M-5H2669 Gasket 2
M-5H2831 Gasket 2
M-5H2912 Gasket 6
M-5H4034 Shutoff Gasket 2
M-5H4110 Gasket 2
M-5H4263 Gasket 1
M-5H4457 Gasket 1
M-5H4470 Gasket 1
M-1L8026 Gasket 6
M-5H4492 Gasket 1
M-5H5601 Gasket 1
M-5H5770 Gasket 1
M-5H5797 Gasket 1
M-5H7704 O-Ring Seal 1
M-5H8090 Lock Nut 1
M-5H8122 Lock Nut 1
M-5H8123 Lock Nut 1
M-5L1150 Gasket 2
M-5L1189 Air Cleaner Gasket 3
M-1S686 Pin - Cotter 12
M-5L1687 Regulator Housing Gasket 1
M-5L1690 Gasket 1
M-5L1691 Gasket 1
M-5L1831 Gasket 1
M-5L1902 Gasket 2
M-5L3712 Gasket 1
M-5L3713 Gasket 2
M-5L3714 Gasket 2
M-5L3772 Gasket 1
M-2453512 Exhaust Manifold Gasket 1
CG72PR Product Box 1
CG72PAD Pad 1
LABEL 4X12 4" X 12" TT Piggyback Perf 1

Disclaimer: Limitless Contracting LLC is an independent supplier of premium aftermarket replacement engine parts. All manufacturer names, numbers, symbols, and descriptions (including Caterpillar, Cummins, Detroit Diesel, etc.) are registered trademarks of their respective owners. Their use on this website is strictly for identification and cross-reference compatibility purposes only. Limitless Contracting LLC is not affiliated with, endorsed by, or sponsored by any OEM trademark holders.

M-1P3748 (Gasket Kit - Overhaul)

$1,276.84


How Do I Make Sure the Part Fits My Engine?

We strongly recommend providing your Engine Serial Number (ESN) or VIN before placing an order. Diesel engine components can vary by engine model, CPL, and production year — even when part numbers look similar.

At Limitless Contracting, we verify compatibility whenever an ESN or VIN is provided to help ensure you receive the correct part the first time.

To avoid delays or incorrect orders:

  • Enter your ESN or VIN on the product page (if required)
  • Or contact our team for verification before purchasing
  • If you're unsure, we’re happy to assist you

Our goal is to eliminate guesswork and keep your equipment running with minimal downtime.

What Is Your Return Policy?

Limitless Contracting offers a structured return policy designed specifically for diesel engine components and heavy-duty parts.

Eligible items may be returned within 30 days of the invoice date, provided they are:

  • Unused and uninstalled
  • In original packaging
  • In resalable condition
  • Accompanied by an approved RMA number

Certain items such as electrical components, gaskets, open kits, special-order items, and installed parts are non-returnable.

Approved returns are subject to a 15% restocking fee, and shipping charges are non-refundable.

For full details — including core returns, freight claims, refund timelines, and international return guidelines — please review our complete:

👉 Returns & Refund Policy

All returns require prior authorization. Unauthorized returns will not be accepted.

How Safe Are Online Transactions with Limitless Contracting?

Online checkout is handled through Shopify's secure checkout and the payment providers enabled for this store. Checkout pages use SSL encryption to help protect personal and payment information during transmission.

Limitless Contracting does not ask customers to send full credit card numbers by email, text, or chat. If you prefer help before ordering, contact us and we can assist with part verification and order questions.

Do You Offer Warranties On Your Products?

Yes. Most engine parts sold by Limitless Contracting are backed by warranty coverage under our Limited Warranty Policy.

Warranty coverage varies by product category and may include:

  • New Engine Components: Up to 24 months from installation
  • Cylinder Heads & Valve Train Components: 12 months from installation
  • Fuel Injector Assemblies: 12 months from installation
  • Remanufactured products may also qualify for coverage

Warranty terms apply to defects in material and workmanship under normal use and service.

Please note:

  • Warranty coverage applies only to the original purchaser
  • Coverage does not extend beyond 36 months from the invoice date
  • Installation must follow OEM guidelines
  • Claims require proper documentation and return authorization
  • Third-party products are subject to the original manufacturer’s warranty terms

Because diesel engine components operate under demanding conditions, warranty eligibility depends on proper installation, maintenance, and diagnostic verification.

For complete details — including exclusions, claim procedures, labor reimbursement limits, and manufacturer-backed components — please review our full:

👉 Warranty Policy

All warranty claims require prior authorization. Core return labels must not be used for warranty claims.

Are Your Parts OEM or Aftermarket?

Limitless Contracting LLC specializes in supplying aftermarket engine components designed to offer reliable fitment and operational durability.

We do not market our parts as original equipment. Instead, we source components through established distributor and supplier networks that focus on recognized aftermarket manufacturing and inspection standards.

Our sourcing partners focus on quality control tracking, including:

  • Standardized aftermarket quality management programs
  • Routine factory and warehouse inspection processes
  • Structured component verification protocols
  • Controlled material and dimensional tracking

Parts in our catalog are offered as aftermarket replacement components for corresponding reference numbers, with fitment details provided to help customers verify compatibility before ordering.

Can I Change or Cancel My Order?

We begin processing orders quickly to minimize downtime for our customers. If you need to change or cancel your order, please contact us as soon as possible.

Order Changes or Cancellations May Be Possible If:

  • The order has not yet shipped
  • The item has not entered freight processing
  • The product is not a special-order or custom-built item

Once an order has shipped, it cannot be canceled. In such cases, the order may fall under our standard return policy, including applicable restocking fees and return shipping costs.

Please note:

  • Special-order and custom items cannot be canceled once processing begins
  • Freight shipments may incur cancellation fees once dispatched
  • Refund timelines follow our Shipping, Returns & Refund Policy

If you need assistance, contact our team immediately with your order number so we can review the status and advise on available options.

Do you offer free shipping or price matching?

Free shipping may be available on select products or qualifying orders once a minimum order value is met. When applicable, this will typically be indicated on the product page or in promotional notices throughout the website.

If you have any questions regarding shipping eligibility, please feel free to contact our team.

We strive to keep our pricing fair, competitive, and transparent. While we do our best to offer strong value, we are happy to review reasonable price-match requests when possible. Please note that this typically excludes pricing errors, limited-time promotions, liquidation sales, auction listings, or pricing from membership-based marketplaces. If you believe you have found a comparable offer, we encourage you to reach out and our team will gladly review it.

Where are you based and where do your orders ship from?

Limitless Contracting LLC is headquartered in the greater Atlanta area in Lawrenceville, Georgia, USA.

Orders may ship from our inventory, supplier warehouses, or distribution partners depending on product availability and destination to ensure efficient and reliable delivery.

When will my order ship and how long will delivery take?

Most orders are processed and shipped within 1–2 business days, depending on product availability and order requirements. Our team works to process and dispatch orders as efficiently as possible; however, fulfillment time may vary based on factors such as order volume, product availability, and any special handling, assembly, or packaging requirements. Orders placed after business hours, on weekends, or on holidays will be processed on the next available business day.

For expedited shipping, the selected shipping service determines the delivery speed once the order has shipped. Please note that selecting expedited shipping does not guarantee immediate shipment, as order processing may still depend on product availability and preparation requirements. If your order is time-sensitive, we recommend contacting our team prior to placing the order so we can assist.

Once shipped, typical transit times are as follows:

  • Ground Shipping: Usually 1–4 business days within the United States, depending on the destination and distance from the shipping origin.
  • Freight Shipping: Typically 1–5 business days, depending on the destination, carrier routing, and delivery scheduling requirements.
  • Expedited Shipping: Delivery time is determined by the specific service selected and the carrier’s terms and conditions.

Please note that transit times are estimates and may vary depending on carrier schedules, weather conditions, and destination accessibility. If you have questions regarding product availability, shipping timelines, or delivery options, our team will be happy to assist.

How can I track my order?

Once your order ships, you will receive a shipping confirmation email containing your tracking number and carrier information.

You can use this tracking number to monitor your shipment directly through the carrier’s website.

Tracking details are typically provided:

  • Within 24 hours of shipment
  • As soon as the carrier scans the package
  • Via the email address used at checkout

For freight (LTL) shipments, tracking may include:

  • Carrier name
  • PRO number
  • Delivery appointment coordination (if required)

If you created an account during checkout, you may also log in to view your order status and shipment details.

If you have not received tracking information or need assistance locating your shipment, please contact our team with your order number and we will be happy to assist.

Do you ship internationally?

Yes, we can support international shipping on a quote-based, case-by-case basis. Sourcing and shipping options depend on part availability, destination regulations, freight requirements, and carrier limitations.

Depending on the order size and destination, shipping options may include:

  • Express parcel courier for small components
  • Air or ocean freight coordination for larger kit assemblies
  • Standard commercial invoicing and required export documentation support
  • Direct coordination with your preferred US-based freight forwarder

Transit timeframes, carrier availability, and shipping costs vary based on destination, package size, and weight. For an international shipping quote or to check destination eligibility, please contact our team with your part numbers and delivery address before ordering.

Will you ship via the U.S. Postal Service (USPS)?

No. Limitless Contracting does not ship orders via the U.S. Postal Service.

Due to the size, weight, and value of diesel engine components, we ship exclusively through reputable national carriers and freight providers, including parcel carriers and LTL freight services.

This allows us to ensure:

  • Reliable tracking
  • Proper handling of heavy or oversized items
  • Freight insurance and claims support
  • Delivery appointment coordination for large shipments

Carrier selection is based on package size, destination, and delivery requirements.

If you have a preferred carrier or freight forwarder, please contact us prior to placing your order and we will review available options.

Can I place an order by phone? How can I contact Limitless Contracting with questions?

Yes. Our team is available to assist with orders and product inquiries. Customers may place orders directly through our website, by email, or by phone, depending on what is most convenient.

If you need help selecting the correct part, confirming availability, or discussing an order, you are welcome to contact our team and we will be happy to assist.

You can reach us by:

  • Phone: (470) 608-3818
  • Email: info@limitless-contracting-llc.com
  • Online Contact Form: Available on our Contact Us page

Our regular business hours are Monday through Friday, 8:00 AM to 6:00 PM (EST). Messages submitted outside of business hours will be reviewed and responded to on the next business day.