Caterpillar 3406 — Turbocharger Inspection
Testing & diagnosis
For the Caterpillar 3406, from the Caterpillar owner's manual.
Applies to: Caterpillar 3406
Before you start
- Turbocharger bearing failure can allow oil to enter intake/exhaust causing serious engine damage
Procedure
- Remove exhaust and inlet piping from turbocharger
- Turn turbine and compressor wheel by hand; should turn freely
- Inspect for contact between wheels and housing
- Check compressor wheel cleanliness for air filter/oil seal leak signs
- Measure shaft end play with dial indicator
- Compare reading to spec 0.076-0.203 mm (0.003-0.008 in)
- Rebuild or replace if out of tolerance
Tools required
- dial indicator Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- End play 0.076-0.203 mm (0.003-0.008 in)
Full service-parts list: Caterpillar 3406 →
Source: Caterpillar owner's 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.