Detroit Diesel — Install Flywheel Housing

Repair & overhaul

From a Detroit Diesel service manual — check it applies to your exact model before use.

Procedure

1. Apply a thin coat of spray adhesive in the flywheel housing seal strip groove and place a new seal strip in the groove.
2. Apply a thin coat of spray adhesive on the exposed flat surface of the seal strip; clean excess grease from the housing.
3. Lubricate the gear train teeth with clean engine oil.
4. Before installing the rear crankshaft oil seal, coat the cavity between the dust lip and the main lip with clean engine oil.
5. Thread the two pilot studs into the cylinder block to guide the housing; use oil seal expander J 22605 on the end of the crankshaft.
6. Position the housing over the crankshaft and up against the cylinder block; remove the oil seal expander.
7. Install the eight 1/2"-13 x 5-1/2" self-locking bolts, new flat washers and new 1/2" seal washers in the idler gear hub holes, finger tight.
8. Remove the pilot studs and install the seven 5/8"-11 x 4-1/2" housing-to-cylinder block bolts with flat washers, finger tight.
9. Install the remaining flywheel housing attaching bolts with washers, finger tight; draw the bolts up snug following the tightening sequence.
10. Tighten the 5/8"-11 bolts to 137-145 lb-ft, the 3/8"-16 bolts to 30-35 lb-ft and the 1/2"-13 bolts to 71-75 lb-ft.
11. Install the outboard bearing support (if used) and the flywheel.
12. Check the flywheel housing concentricity and bolting flange face with tool set J 9737-C.

Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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