Detroit Diesel — Assemble Gear, Hub And Bearing Assemblies (Rear Gear Train)
Repair & overhaul · Camshaft Gears and Idler Gears
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Use a punch to drive the dimpled lip of the locknut out of the hub before attempting to remove the nut.
Procedure
- Install and torque the current lipped locknuts: apply International Compound No. 2 to threads and face of the locknut; thread finger-tight onto the hub.
- Using the appropriate socket from tool set J 29744 and an accurately calibrated torque wrench, tighten the locknut to 300-320 lb-ft; rotate the gear while tightening.
- With a hammer and rounded punch, dimple the outer lip of the locknut into the slot in the hub.
- Bend one or more of the tangs on the lock washer into the slots on the locknut.
- Perform a bearing pre-load check.
- Install one outer and one inner spacer in former camshaft and idler gear assembly; install two outer spacers and one inner spacer in idler gear assembly.
- Assemble the bearing assemblies in the gears with reference to the match marks made during disassembly (idler gear outer spacers with gaps 180° apart).
- Support the gear in an arbor press; press one bearing cup into the bore of the gear and against the spacers, then the remaining cup.
- Position the two bearing and cone assemblies and the spacer ring in the gear.
- Press the gear hub into the gear and bearing assembly with the oil hole in the hub 180° from the gap in the spacer ring.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Current lipped locknut 300-320 lb-ft (407-434 N·m)
- Non-lipped locknut 280-300 lb-ft (379-407 N·m)
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.