3R8955 | Caterpillar 6.25"/D353/D379/D398/D399 Overhaul Supplement Gasket Set, New

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3R8955 | Caterpillar 6.25"/D353/D379/D398/D399 Overhaul Supplement Gasket Set, New

Product Overview
This heavy-duty replacement component is engineered to meet or exceed OEM specifications for reliable performance and long service life in demanding diesel engine applications. Each unit is manufactured with strict quality control standards to help ensure proper fitment and durability in professional diesel engine rebuild environments.

Kit Contents

Kit: M-3R8955 — Gasket Set - Overhaul
Line No Kit Item No Item Name Qty UOM
1 M-1A7427 Lock - Nut 7 EA
2 M-4F5607 Seal - O-Ring 12 EA
3 M-4H2494 Sleeve 8 EA
4 M-4H5952 Gasket 12 EA
5 M-4L3020 Gasket 12 EA
6 M-4L7890 Gasket 4 EA
7 M-4L7907 Gasket 2 EA
8 M-4L8097 Gasket 12 EA
9 M-4L8128 Gasket 5 EA
10 M-4L8337 Seal - O-ring - Air Compressor 4 EA
11 M-5B3718 Seal - O-Ring 12 EA
12 M-1P8004 Gasket 12 EA
13 M-5H7704 Seal - O-ring 4 EA
14 M-2453512 Gasket - Exh Manifold 1 EA
15 M-5L9842 Gasket 2 EA
16 M-6F1069 Seal - O-Ring 12 EA
17 M-6L1650 Seal - O-ring 2 EA
18 M-6L1651 Seal - O-ring 13 EA
19 M-6L3352 Gasket 6 EA
20 M-6L4497 Gasket 6 EA
21 M-6L5366 Gasket 2 EA
22 M-1S4295 Gasket - Turbocharger 2 EA
23 M-6L7816 Seal - O-ring 12 EA
24 M-6L7817 Seal - O-ring 24 EA
25 M-7B280 Seal 4 EA
26 M-7H9832 Lock - Nut 6 EA
27 M-7L2149 Gasket 24 EA
28 M-7L7160 2 EA
29 M-8F4994 Seal - O-ring 12 EA
30 M-8F9206 Seal - O-ring 24 EA
31 M-8M4437 Seal - O-ring 6 EA
32 M-1S4810 Gasket - Turbocharger Oil Supp 2 EA
33 MCB6B6224 Ferrule and Seal Assy 48 EA
34 MCB7B2420 Ferrule and Seal Assy 36 EA
35 M-8N7780 Shield 12 EA
36 M-1S6595 Gasket - Turbocharger Oil Supp 2 EA
37 M-2A3278 Gasket 2 EA
38 M-3F4550 Lock 12 EA
39 M-3N3220 Gasket - Cylinder Head 6 EA
40 M-3S9643 Seal - Thermostat 4 EA

Key Features

  • OE-style fitment for proper installation
  • Durable construction for demanding operating conditions
  • Engineered for dependable heavy-duty diesel performance

About Interstate-McBee
Interstate-McBee is a trusted manufacturer of premium aftermarket diesel engine components. Products are manufactured under ISO 9001:2015 quality management standards and are engineered to meet or exceed OEM specifications. With decades of experience supporting the diesel and gas engine industries, Interstate-McBee components are designed to deliver consistent quality, reliability, and performance for heavy-duty engine applications.

Any mention of OEM names or OEM product ID numbers/descriptions/model numbers is intended for identification purposes only and does not indicate that it is an OEM part.

  • 3R8955

Free Standard ground shipping within the Continental US! If you need your parts in a hurry and would like to get them overnighted or expedited please give us a call and our sales reps will let you know what options are available!

2 year warranty applies!

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Buy Now, Pay Later

Interest-Free Up To 12M

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Above The Line

Customer Service Guaranteed

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Free Ground Shipping

On All Orders!

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Premium Quality Parts

Manufacturing Since 1973

offer

Buy Now, Pay Later

Interest-Free Up To 12M

offer

Above The Line

Customer Service Guaranteed

offer

Free Ground Shipping

On All Orders!

offer

Premium Quality Parts

Manufacturing Since 1973