Detroit Diesel — Checking and Adjusting Gear Lash with Camshaft Housing Removed
Adjustments · Gear train
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- Remove the camshaft housing if not already removed.
- Install a magnetic base dial indicator gauge on engine block and set on idler gear No. 5 tooth.
- Turn idler gear No. 5 counterclockwise until zero lash; zero the gauge.
- Check gear lash by turning idler gear No. 5 stop-to-stop (0.043 - 0.165 mm).
- Remove access cover to the idler gear No. 3 bolts; loosen and snug the two bolts by hand.
- Turn idler gear No. 5 clockwise to set desired gear lash.
- Tighten the two bolts on the number three gear.
- Verify lash by turning idler gear No. 5 stop-to-stop (0.043 - 0.165 mm).
- Final torque idler gear No. 3 bolts to 60-65 N·m.
- Install access cover and tighten.
Tools required
- Magnetic base dial indicator gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Gear lash: 0.043 - 0.165 mm (0.0016 - 0.0065 in)
- Idler gear No. 3 bolts final torque: 60-65 N·m (44-48 lb·ft)
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.