RING-BACKUP 1733237 - Caterpillar

Disassembly Procedure For The NA 297 Turbocharger
Table 1
Required Tools
Tool Part Number Part Description Qty
A 178-0193 Torque Wrench Adapter 1
B 178-0196 Torque Wrench Adapter 1
C 177-9781 Lifting Bracket 1
D 177-9852 Guide Rod 1
E - Forcing Screws 3
F 177-9791 Shaft Locking Tool 1
G 177-9795 Socket 1
H 177-9800 Brace 1
J - Socket 1
K 6V-7820 Torque Multiplier 1
L 439-3940 Link Bracket 2
M 1U-8014 Allen Wrench 6mm 1
N 177-9809 Guide Rod 2
P 177-9811 Removal Tool 1
Q 6V-9104 Wrench 30mm 1
Check the turbocharger's nameplate for the model. Use the appropriate disassembly procedure depending on the type of turbocharger. If the model or type on the turbocharger's nameplate reads C254xx-xxxxxx, use the disassembly procedure for VTC 254 Turbochargers. If the model or type on the turbocharger's nameplate reads NA 297 or Napier 297, use the disassembly procedure for NA 297 Turbochargers.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Disconnect the oil system if the oil is supplied externally.
Disconnect the air pipes and the exhaust bellows.
Disconnect the instrumentation and protect all this instrumentation.
Seal all points until reassembly.
Disconnect the turbocharger wash group, if equipped.
Disconnect the speed sensor connection.
Disconnect the connections to the turbine inlet.
Disconnect the turbine water wash injectors, if equipped.
Attach a suitable lifting device to the lifting points of the turbocharger at the bearing housing and the gas outlet housing.
Use Tooling (A) in order to remove the bolts from the mounting foot of the turbine end.
Remove the main mount bolts. Note: Use Tooling (C) in order to ensure that the turbocharger remains level during the removal.
Remove the turbocharger from the engine.
Illustration 1 g03821356
Mount turbocharger (1) on a suitable service platform. Note: Ensure that turbocharger (1) is mounted securely before more work is performed. Damage may occur if the turbocharger is not mounted properly.
Remove bolts (3). Using two people, remove exhaust adapter (2). The weight of exhaust adapter (2) is approximately 35 kg (77 lb).
Illustration 2 g03821361
Remove and discard gasket (4).