Turbocharger Oil Supply

This information applies to 2001-06 Chevrolet, Express, Kodiak, Silverado and 2001-06 GMC Sierra, Topkick. with the 6.6 LB7, LBZ, and LLY engine.

The turbocharger oil feed line is a high pressure plastic tube protected by a stainless steel braided covering (fig. 16). If it is twisted or bent too far during turbocharger removal, the plastic line may fold and kink. The kink may cause an oil flow restriction or an oil leak.

TIP: If the plastic pipe becomes kinked, it will not return to its normal size and shape. The damage may not be obvious when inspected. The braided steel covering will hide the deformity.

During any type of repair that includes turbocharger oil feed line removal, do not twist or turn the line. This type of movement will immediately collapse the plastic line.

6.6 LB7 engine -- The turbocharger oil feed line can be pulled directly away from the turbocharger body in a perpendicular fashion. Be careful to avoid excessive bending of the line.

6.6 LBZ or LLY engine -- The EGR cooler does not allow enough perpendicular movement of the line to clear the turbocharger for removal. You can push the line straight forward of the turbocharger with less risk of kinking the line.

TIP: You may need assistance to keep the lines clear of the turbocharger during removal or installation.

- Thanks to Don Langer