Detroit Diesel — Breather Housing Seal Ring Repair and Installation

A Detroit Diesel service procedure — check it applies to your exact model before use.

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Procedure

1. 1. Disconnect the breather hose from the breather housing.
2. 2. Disconnect the engine block tube and remove the breather housing from the flywheel housing.
3. 3. Remove the seal ring from the groove in the breather housing (see Figure 2) and discard it. Do not re-use the seal ring.
4. 4. Clean oil from the seal ring groove in the breather housing and from the mounting surface at the flywheel housing using a common solvent.
5. 5. A new gasket set must be applied to the breather assembly. See figure 3 for part numbers.
6. 6. Install the new breather housing gasket (P/N: 4760150080) between the breather housing and the flywheel housing using the center bolt of the breather housing. See Figure 4 for installation details.
7. 7. Install the new seal ring (P/N: 4760170060) at the lower bolt of the breather housing. See Figure 4 for installation details.
8. 8. Add the new washer (P/N: 200433013000) at the upper bolt of the breather housing to compensate for the thickness of the breather housing gasket - see Figure 5 for details.
9. 9. Tighten all three M8X35 mm breather housing bolts to 25 Nm (19 lb-ft).
10. 10. Connect the engine block tube to the breather housing.
11. 11. Connect the breather hose to the breather housing.
12. 12. Start the engine and check for leaks.

Source: manual:04ts49.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.