Detroit Diesel — Installation of Flywheel
Installation
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Flywheel mounting bolts are one-use items and cannot be reused.
- Hold flywheel against crankshaft when removing last bolt.
Procedure
- Ensure crankshaft, flywheel contact surfaces and bolt threads are clean and dry.
- Attach flywheel lifting tool J 25026-A and chain hoist.
- Position flywheel in housing using guide studs.
- Align flywheel bolt holes with crankshaft bolt holes.
- Install clutch pilot bearing, if used.
- Install two bolts through scuff plate 180 degrees apart and tighten.
- Remove guide studs and lifting tool.
- Apply International Compound No. 2 to bolt threads and head contact area.
- Install and tighten remaining bolts to 68 N·m (50 lb·ft).
- Mark bolt heads and rotate: bolts 2 3/4 in. and under 90-100 degrees; over 2 3/4 in. 150-180 degrees.
- Mount dial indicator and check flywheel run-out at clutch contact face.
Tools required
- Flywheel lifting tool J 25026-A Amazon
- Chain hoist Amazon
- Guide studs Amazon
- Torque wrench Amazon
- Dial indicator Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Bolts tightened to 68 N·m (50 lb·ft) then torque-turn
- Flywheel run-out max 0.025 mm (0.001 in.) TIR per inch of radius
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.