RING-RETAINING 1838452 - Caterpillar

Introduction
This special instruction provides the instructions for the installation of the turbocharger. Turbochargers are sensitive to contamination. Failure to follow any of the procedures may result in damage, a malfunction, or possible engine failure.The following items have been made available to help reduce premature Turbocharger failure due to contamination.
A magnetic cover SELD0271 has been placed over the oil inlet on the turbocharger.
A quick reference Critical Requirements, REHS3033 has been attached to all turbochargers.
An instruction manual for turbocharger failures has also been published in order to assist in diagnosing turbocharger failures. The document is Special Instruction, SEBF9085, "Failure Modes of Turbochargers".
The correct procedures and tooling specifications must always be used. Failure to follow any of the procedures may result in damage, malfunction, or possible engine failure.
General
Clean the area around the turbocharger in order to remove potential contaminants.
Examine the turbocharger for potential causes of failure.
If there is any damage to the turbine wheel, examine the exhaust system and the exhaust manifold to ensure that no foreign material remains.
If there is any damage to the compressor wheel, examine the air cleaner, the aftercooler, and the ducting to ensure that no foreign material remains.
If there is any sign of oil on the compressor side, inspect the accumulator/oil separator and the aftercooler.
Oil that is left in the Air-To-Air Aftercooler can result in engine overspeed.
Work in an enclosed area or use tarps to minimize the entrance of airborne debris. Leave the SELD0271 magnetic cover in place over the oil inlet on the turbocharger. The cover will help prevent contamination during installation.
The bolts in the turbochargers may be intentionally left loose in order to facilitate the installation. Extra bolts may be required.Proceed to the Installation and Prelubing of the Turbocharger section if the following items are complete.
The turbocharger compressor housing and the turbine housing are aligned.
The bolts should be tight.
All of the locking tabs should be bent upward.Realignment of the End Housing
Loosen the bolts for the turbocharger compressor housing and the bolts for the turbocharger turbine housing, and/or loosen the nuts on the V-band clamp. Excessive loosening of the housings will cause contact between the internal components of the turbocharger. Possible damage to the turbine wheel may occur.
Temporarily secure the turbocharger to the output flange of the engine exhaust manifold. Ensure that the bolts are snug.
Rotate the center housing so that the oil inlet and outlet ports will mate with the turbocharger oil supply line and oil drain line. The oil outlet must be at the bottom.Note: If the turbocharger has a drain tube, use the drain tube to verify proper orientation of the bearing housing. The drain tube should be installed so that there is no binding of the tube after the installation. For turbochargers without a drain tube, the centerline of the hole must not be more than 35 degrees from vertical.
Tighten at least two of the bolts or the V-band clamp in order to lock the center housing to the turbine housing.
Rotate the compressor housing until the housing lines up with the