3R8956 | Caterpillar 6.25"/D353/D379/D398/D399 Overhaul Gasket Set, New

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3R8956 | Caterpillar 6.25"/D353/D379/D398/D399 Overhaul 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-3R8956 — Gasket Kit - Overhaul
Line No Kit Item No Item Name Qty UOM
1 M-0L364 Lock 20 EA
2 M-1H1023 Seal - O-ring 1 EA
3 M-5H6733 Seal - O-ring 6 EA
4 M-5H7704 Seal - O-ring 4 EA
5 M-5L2093 Gasket 2 EA
6 M-5L2135 Gasket 1 EA
7 M-5L2904 1 EA
8 M-5L3124 Gasket 1 EA
9 M-5L3377 Gasket 2 EA
10 M-5L3378 Gasket 5 EA
11 M-2453512 Gasket - Exh Manifold 1 EA
12 M-5L4949 Lock - Nut 1 EA
13 M-1H8278 Seal - O-ring 2 EA
14 M-5L5986 Gasket 1 EA
15 M-5L8043 Gasket 2 EA
16 M-5L8444 5 EA
17 M-5L8991 Gasket - Cover 1 EA
18 M-5L9842 Gasket 2 EA
19 M-5N3275 Gasket 2 EA
20 M-6B8241 Gasket 1 EA
21 M-6F1069 Seal - O-Ring 12 EA
22 M-6F5411 Gasket 4 EA
23 M-6H4206 1 EA
24 M-1P8004 Gasket 12 EA
25 M-6L1540 Gasket 2 EA
26 M-6L1649 Seal - O-ring 2 EA
27 M-6L1650 Seal - O-ring 6 EA
28 M-6L1651 Seal - O-ring 17 EA
29 M-6L1881 Lock - Nut 16 EA
30 M-6L2069 Gasket 1 EA
31 M-6L3352 Gasket 6 EA
32 M-6L4497 Gasket 6 EA
33 M-6L5298 Gasket 1 EA
34 M-6L5360 Seal - O-ring 2 EA
35 M-1S4295 Gasket - Turbocharger 2 EA
36 M-6L5366 Gasket 2 EA
37 M-6L5567 Gasket 1 EA
38 M-6L5766 Gasket 1 EA
39 M-6L5773 Gasket - Fuel Pump 1 EA
40 M-6L6487 Gasket 4 EA
41 M-6L6489 Gasket 4 EA
42 M-6L7815 Seal - O-ring 36 EA
43 M-6L7816 Seal - O-ring 12 EA
44 M-1S4810 Gasket - Turbocharger Oil Supp 2 EA
45 M-6L7817 Seal - O-ring 24 EA
46 M-6L8037 Gasket 1 EA
47 M-6L8966 Gasket 1 EA
48 M-7B280 Seal 4 EA
49 M-7B9514 Lock 2 EA
50 M-7F2836 Lock - Auxiliary Pump 2 EA
52 M-7F7510 Lock - Nut 5 EA
53 M-7F7669 Gasket 1 EA
54 M-7H9832 Lock - Nut 6 EA
55 M-1S6595 Gasket - Turbocharger Oil Supp 2 EA
56 M-7L2149 Gasket 24 EA
57 M-7L2905 Gasket 1 EA
58 M-7L2906 2 EA
59 M-7L3111 Gasket 2 EA
60 M-7L8682 Gasket 1 EA
61 M-7M4340 Lock - Bolt 24 EA
62 M-7M4353 Gasket 2 EA
63 M-7M6843 Gasket 1 EA
64 M-7M6844 Gasket 1 EA
65 M-7M9919 6 EA
66 M-1S7336 Lock 2 EA
67 M-8B3410 1 EA
68 M-8B4967 Seal - O-ring 2 EA
69 M-8F4994 Seal - O-ring 12 EA
70 M-8F8682 Lock - Screw 5 EA
71 M-8F8683 Lock - Screw 1 EA
72 M-8F9206 Seal - O-ring 26 EA
73 M-8H1607 Seal - O-ring 1 EA
74 M-8L3873 Gasket 2 EA
75 M-8L4156 Gasket 1 EA
76 M-8L4159 Gasket 1 EA
77 M-2A3278 Gasket 2 EA
78 M-8L5457 Gasket 2 EA
79 M-8L6207 Gasket 1 EA
80 M-8M4437 Seal - O-ring 6 EA
81 M-8M4445 Seal - O-ring 1 EA
82 M-8M4988 Seal - O-ring 1 EA
83 M-8M4989 Seal - O-ring 1 EA
84 M-8M8997 Seal - O-ring 1 EA
85 M-9F4446 Seal - O-ring 5 EA
86 M-9F4522 Gasket 1 EA
87 M-9H6067 Seal - O-ring 2 EA
88 M-2A3855 1 EA
89 M-9M3866 Gasket 1 EA
90 M-9M4217 Seal - O-ring 1 EA
91 M-9M6292 Lock 1 EA
92 M-9M7660 Gasket 1 EA
93 M-9M9545 Seal - O-ring 3 EA
94 M-9M9647 Seal - O-ring 1 EA
95 M-9S4671 Oil Seal 1 EA
96 MCB6B6224 Ferrule and Seal Assy 48 EA
97 M-2A5328 Lock 3 EA
98 MCB7B2420 Ferrule and Seal Assy 36 EA
99 M-8N7780 Shield 12 EA
100 M-0L796 Lock 1 EA
101 M-2F2005 Gasket 1 EA
102 M-2F4159 Lock 1 EA
103 M-2H2665 Seal - Elbow 8 EA
104 M-2H4513 Gasket 1 EA
105 M-2H5001 Ring - Seal 1 EA
106 M-2J157 Seal - O-ring 2 EA
107 M-2K8199 Seal - Hydraulic 1 EA
108 M-2L4730 Gasket 1 EA
109 M-2L5970 Sleeve 1 EA
110 M-2M2489 Oil Seal 4 EA
111 M-0L1213 Gasket 2 EA
112 M-2M4453 Seal - O-ring 12 EA
113 M-2M8663 Seal - O-ring 12 EA
114 M-2N5693 Gasket 2 EA
115 M-2S3966 Ring 1 EA
116 M-3F4550 Lock 12 EA
117 M-3H2652 Seal - O-ring - Planetary 1 EA
118 M-3H5939 Gasket - Expansion Tank 1 EA
119 M-3N3220 Gasket - Cylinder Head 6 EA
120 M-3S1427 Seal - O-ring 3 EA
121 M-3S3535 Seal 1 EA
122 M-0L1477 Lock - Screw 2 EA
123 M-3S4182 Seal 1 EA
124 M-3S6552 Gasket 1 EA
125 M-3S9643 Seal - Thermostat 4 EA
126 M-3S4819 1 EA
127 M-4F5607 Seal - O-Ring 12 EA
128 M-4F7387 Seal - O-ring - Oil Cooler 3 EA
129 M-4F7391 Seal - Hydraulic 1 EA
130 M-4F7952 Seal - Hydraulic 1 EA
131 M-4H1723 3 EA
132 M-4H2494 Sleeve 10 EA
133 M-1A7427 Lock - Nut 7 EA
134 M-4H2662 Sleeve 8 EA
135 M-4H5952 Gasket 12 EA
136 M-4L3375 Gasket - Acc Drive 2 EA
137 M-4L3392 Gasket - Acc Drive 1 EA
138 M-4L3437 Gasket - Acc Drive 8 EA
139 M-4L3759 Nut - Lock 3 EA
140 M-4L5832 Gasket 2 EA
141 M-4L6182 Lock - Nut 2 EA
142 M-4L6183 4 EA
143 M-4L6184 Lock - Nut 1 EA
144 M-1F3131 Gasket 1 EA
145 M-4L6216 Gasket 3 EA
146 M-4L6706 Gasket 20 EA
147 M-4L6768 Gasket 1 EA
148 M-4L7586 Gasket 1 EA
149 M-4L7631 Gasket 1 EA
150 M-4L7823 Lock 2 EA
151 M-4L7854 1 EA
152 M-4L7870 5 EA
153 M-4L7890 Gasket 4 EA
154 M-4L7904 Gasket 2 EA
155 M-1F4419 Gasket 6 EA
156 M-4L7907 Gasket 2 EA
157 M-4L7923 Gasket 1 EA
158 M-4L8097 Gasket 12 EA
159 M-4L8120 Gasket - Oil Cooler 2 EA
160 M-4L8121 Gasket 2 EA
161 M-4L8128 Gasket 5 EA
162 M-4L8132 Gasket 1 EA
163 M-4L8144 Gasket 2 EA
164 M-4L8149 Gasket 6 EA
165 M-4L8162 Gasket 1 EA
166 M-1F6936 4 EA
167 M-4L8175 Gasket 1 EA
168 M-4L8176 Gasket 1 EA
169 M-4L8191 Gasket 1 EA
170 M-4L8212 Gasket 2 EA
171 M-4L8215 Gasket 1 EA
172 M-4L8337 Seal - O-ring - Air Compressor 4 EA
173 M-4L8606 Gasket - Oil Cooler Lines 4 EA
174 M-4L8644 Gasket 3 EA
175 M-4L8651 Gasket 2 EA
176 M-4L8767 Nut - Lock 1 EA
177 M-1F9223 Gasket - Cylinder Block Side C 6 EA
178 M-4L9965 Gasket 2 EA
179 M-4M8974 Lock - Nut 1 EA
180 M-4N7526 Seal 1 EA
181 M-4S9248 Seal - Turbocharger 2 EA
182 M-5B3265 Washer 3 EA
183 M-5B3718 Seal - O-Ring 12 EA
184 M-5B6031 Gasket 1 EA
185 M-5B8932 Gasket 1 EA
186 M-5F7054 Seal - O-ring 4 EA
187 M-5H6012 Seal - Lip Type 3 EA
188 M-4H1723 3 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.

  • 3R8956

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