Caterpillar — Turbocharger - Clean and Inspect
Maintenance
From a Caterpillar owner's manual covering: 3408C, 3412, 3412C. Check it applies to your exact model before use.
Applies to: Caterpillar 3408C, Caterpillar 3412, Caterpillar 3412C
Before you start
- Turbocharger bearing failures can cause large quantities of oil to enter the air inlet and exhaust systems.
- Do not continue engine operation with a turbocharger bearing failure and significant performance loss.
Procedure
- Remove exhaust outlet piping and air inlet piping; visually inspect piping for oil.
- Clean the interior of the pipes to prevent dirt entering during reassembly.
- Turn compressor and turbine wheels by hand; assembly should turn freely.
- Inspect wheels for contact with the turbocharger housing.
- Check compressor wheel cleanliness; oil on the back side may indicate failed oil seal.
- Use a dial indicator to check shaft end clearance against Service Manual specifications.
- Inspect the bore of the turbine housing for corrosion.
- Clean housing with standard shop solvents and a soft bristle brush; fasten piping.
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 greater than Service Manual specifications requires repair or replacement
Full service-parts list: Caterpillar 3408C →, Caterpillar 3412 →, Caterpillar 3412C →
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.