Detroit Diesel — Install Crankshaft

Repair & overhaul

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

Procedure

1. Assemble the crankshaft timing gears and front timing gear damper.
2. Turn the engine so the front end is facing down; remove the piston and cylinder liner retainers.
3. Remove the pistons, connecting rods and cylinder liners from the cylinder block; turn the engine upside down.
4. Install the upper grooved main bearing shells in the block.
5. Apply clean engine oil 360° around all crankshaft bearing journals and install the crankshaft so the timing marks match.
6. Install the upper halves of the crankshaft thrust washers and the doweled lower halves; grooved side faces toward the crankshaft thrust surface.
7. Install the lower main bearing shells (no oil grooves) in the bearing caps.
8. Install the bearing caps and lower bearing shells.
9. Check the crankshaft end play with a small pry bar and dial indicator (.004"-.014" new; max .018" used).
10. Position the engine with the front face down and install the pistons, connecting rods and cylinder liners; install retainers.
11. Turn the engine right side up and install the front cover, outboard bearing support and seal assembly.
12. Install the heat exchanger, thermostat housings, water pump and vibration damper.
13. Install the crankshaft cap or pulley retaining bolt and washer.
14. Install the flywheel housing, outboard bearing support and flywheel assembly.
15. Check the crankshaft for distortion at the rear connecting rod journal counterweights (max .0045" TIR).

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.

More Detroit Diesel repair guides →