Napier NA255
Compact unit heavily used in onboard generators and classic ferries.
Reference Numbers
These reference numbers identify a part's position on the series diagram — the exact part fitted differs by model. To order, provide the reference number together with the model name and the serial number stamped on the nameplate.
Consumable Items
111
Bolt
117
Plug
118
Plug
136
Nut
137
Nut
138
Nut
139
Nut
140
O-ring
160
Drive Screw
162
Drive Screw
163
Screw Set
164
Screw Set
165
Screw Set
166
Screw Set
167
Screw Set
168
Screw Set
169
Screw Set
170
Screw Set
171
Screw Set
172
Stud
178
Washer Tab
179
Washer Tab
180
Washer Tab
181
Washer Tab
184
Washer Joint
185
Washer Joint
189
Washer Joint
190
Spring Washer
191
Spring Washer
192
Spring Washer
193
Spring Washer
194
Spring Washer
198
Washer Plain
Main Casing
200
Main Casing Assembly
201
Main Casing
202
Packing Ring
203
Cone
204
Joint, Cone
205
Seal Plate
206
Seal Ring Bush, Turbine End
207
Joint for item 206
215
Labyrinth Seal Plate
216
Peelable Shim for item 215
231
Seal Ring Bush, Compressor End
232
Joint Washer for item 231
234
Name Plate
249
Bearing, Turbine End
253
Bearing, Compressor End
253A
Bearing Flange Support
278
Speed Probe Assembly
279
Back Up Plate for item 278
280
Oil Drain Blanking Plate
281
Joint for item 280
287
Lifting Bracket
290
Screw for Compressor End Bearing
291
Screw for Packing Ring 202
Rotor Assembly
301
Rotor Assembly
302
Shaft, Disc and Blades Assembly
303
Impeller
305
Thrust Collar
306
Impeller Adjustment Washer
307
Nut, Shaft End
308
Lock Washer
309
Impeller Drive Washer
311
Seal Ring, Turbine End
312
Seal Ring, Compressor End
Compressor Outlet Casing
401
Compressor Outlet Casing Assembly
420
Screw, Diffuser
421
Diffuser
423
Lifting Hole Plug
Turbine Outlet Casing
500
Turbine Outlet Casing Assembly
501
Turbine Outlet Casing
503
Cover Plate, Sub Assembly
506
Plug, Anti-Corrosion
507
Lifting Bracket
508
Nameplate for item 503
513
Dowel
514
Foot
515
Joint for items 514 and 503
Turbine Inlet Casings
607
Turbine Inlet Casing Assembly (Air Cooled Single Entry Casing, Axial)
609
Air Cooled, Twin Entry Casing, Axial
611
Air Cooled, Four Entry Casing, Axial
623
Gasket Between Turbine Inlet and Turbine Outlet Casing
650
Nozzle Assembly
651
Tab Washer, Nozzle
652
Clamping Ring, Nozzle
653
Shroud Ring
654
Bolt, Shroud Ring
655
Nut
Compressor Inlet Casing/Air Filter Silencer
701
Compressor Inlet Casing Assembly
702
Compressor Inlet Casing (Twin Entry)
703
Compressor Inlet Casing (Single Entry)
705
Extension Piece
740
Air Filter Silencer Assembly
746
Filter Panel Assembly (3 Sections)
747
Front Casing Fabrication
748
Rear Casing Fabrication
749
Stud
750
Stud and Nut Fabrication
751
Baffle Fabrication (Large)
752
Baffle Fabrication (Mid)
753
Baffle Fabrication (Small)
754
Spacer Tube (Rear)
755
Spacer Tube (Mid)
756
Spacer Tube (Front)
760
Spacer (Filter to Compressor Casing)
761
Grommet, Blind
Optional Items
900
Pressurised Water Washing Unit
901
Mounting Head
902
Bowl
903
Pneumatic Valve (Inlet)
904
Filler Cap
905
Capscrew
906
Capscrew
907
Blanking Plug
908
Capscrew
909
Philidas Nut
910
Extra Large Washer
911
Bonded Seal
912
Pneumatic Valve (Outlet)
913
Capscrew
914
Spring Washer
915
Stud Coupling Complete
916
Stud Coupling Complete
917
Pipe
950
Water Washing Pipe Assembly
951A
Water Wash Pipe (S.E.C. Twin)
951B
Water Wash Pipe (A.F.S.)
951C
Water Wash Pipe (S.E.C. Single)
953
Grommet
954
Washer
955
Stud Coupling
956
Stud Coupling