- Marine Engines:
- 3408 (S/N: 99U1-UP)
- 3408 (S/N: 78Z1-UP; 60M1-UP; 81Z1-UP)
- 3408B (S/N: 1LG1-UP)
- 3408C (S/N: 1TS1-UP)
- 3412E (S/N: 9PW1-UP)
Cracks in the welding are found on 7N-3175 Manifold. The 7N-3175 Manifold is used on 3408 and 3412 engines. The cracks in the welding are due to poor coolant flow.
The flow of coolant and venting through the manifold has been improved. The new manifold eliminates the hot spots. The hot spots promote cracking.
3408
The following parts list is required to update the 7N-3175 Manifold to the 147-0642 Manifold.
| Required Parts | ||
| Pt. No. | Description | Qty |
| 3D-2824 | O-Ring Seal | 1 |
| 5P-1230 | Connector | 1 |
| 7W-1890 | Elbow | 1 |
| 7X-7958 | Hose Clamp | 2 |
| 5P-1251 | Hose | 27 cm. |
| 4N-1918 | Gasket | 2 |
| 7C-0307 | Gasket | 10 |
| 109-0076 | O-Ring Seal | 8 |
| 7M-7273 | Gasket | 1 |
| 156-1732 | Tube As | 1 |
| 198-6068 | Integral Seal | 1 |
| 126-2702 | Integral Seal | 1 |
| 147-0642 | Manifold As | 1 |
Upon installation of the 147-0642 Manifold, remove the 6N-9300 Tube As, the 9L-4007 Flared Elbow and the 6N-4573 Oil Tube As. Discard the 6N-9300 Tube As, the 9L-4007 Flared Elbow and the 6N-4573 Oil Tube As. The new lines group uses a coolant hose and fittings. The new lines group replaces the tube assembly. Installation of a 156-1732 Oil Supply Tube is also required. Refer to Illustration 1 for assembly instructions.
 | |
| Illustration 1 | g01260499 |
(1) 7W-1890 Elbow
(2) 7X-7958 Hose Clamp
(3) 5P-1251 Hose
(4) 5P-1230 Connector
(5) 3D-2824 O-Ring Seal
(6) 7X-7958 Hose Clamp
3412 and 3412E
The following parts list is required for the (S/N: 60M), the (S/N: 81Z) and the (S/N: 9PW).
| Required Parts for 4W-3920, 7W-7584, 124-3400, 179-0770, 144-4583 and 183-3882 | ||
| Pt. No. | Description | Qty |
| 3D-2824 | O-Ring Seal | 1 |
| 5P-1230 | Connector | 1 |
| 005-4273 | Hose Connector | 1 |
| 006-5707 | Pipe Elbow | 1 |
| 7X-7958 | Hose Clamp | 1 |
| 5P-1251 | Hose | 27 cm |
| 4N-1918 | Gasket | 2 |
| 7C-0307 | Gasket | 10 |
| 109-0076 | O-Ring Seal | 8 |
| 7M-7273 | Gasket | 1 |
| 140-0024 | Tube As | 1 |
| 198-6068 | Integral Seal | 1 |
| 126-2702 | Integral Seal | 1 |
| 147-0642 | Manifold As | 1 |
Upon installation of the 147-0642 Manifold, remove the 1W-6245 Tube As and the 1W-6250 Oil Tube As. Discard the 1W-6245 Tube As and the 1W-6250 Oil Tube As. The new lines group uses a coolant hose and fittings. The new lines group replaces the tube assembly. Installation of a 140-0024 Oil Supply Tube is also required. Refer to Illustration 2 for assembly instructions.
 | |
| Illustration 2 | g01260513 |
(1) 006-5707 Pipe Elbow
(2) 005-4273 Hose Connector
(3) 7X-7958 Hose Clamp
(4) 5P-1251 Hose
(5) 5P-1230 Connector
(6) 3D-2824 O-Ring Seal
(7) 7X-7958 Hose Clamp
3412
The following parts list is required for (S/N: 60M).
| Required Parts for 4N-2247, 130-2549 and 185-5890 | ||
| Pt. No. | Description | Qty |
| 3D-2824 | O-Ring Seal | 1 |
| 5P-1230 | Connector | 1 |
| 7W-1890 | Elbow | 1 |
| 7X-7958 | Hose Clamp | 2 |
| 5P-1251 | Hose | 27 cm. |
| 4N-1918 | Gasket | 2 |
| 7C-0307 | Gasket | 10 |
| 109-0076 | O-Ring Seal | 8 |
| 7M-7273 | Gasket | 1 |
| 156-1732 | Tube As | 1 |
| 198-6068 | Integral Seal | 1 |
| 126-2702 | Integral Seal | 1 |
| 147-0642 | Manifold As | 1 |
Upon installation of the 147-0642 Manifold, remove the 6N-9300 Tube As, the 9L-4007 Flared Elbow and the 4N-6161 Oil Tube As. Discard the 6N-9300 Tube As, the 9L-4007 Flared Elbow and the 6N-4573 Oil Tube As. The new lines group uses a coolant hose and fittings. The new lines group replaces the tube assembly. Installation of a 152-8348 Oil Supply Tube is also required. Refer to Illustration 1 for assembly instructions.