EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-24-02
ALL ú ú N01 Page 202 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(2) S 422-003-N00Attach the clampshells on to the tube and engage them with each other.
NOTE:____ The clampshell halves are the same.
Install the clamp as near to the center of the clampshell as possible. But, you cannot install the clamp at a position between the clampshell shoulders if the adjacent installations have an effect on the location of the clamp.
(3) S 432-004-N00Attach the clampshell clamp assembly with a size number 10 fastener.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-24-02
ALL ú ú N01 Page 203 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BALL AND ROLLER BEARINGS - MAINTENANCE PRACTICES
________________________________________________
1. General
_______
A. This task gives the steps to install the ball and roller bearings, which have clearance fits, on their mating shafts. No special steps are necessary to remove the ball and roller bearings.
TASK 70-24-04-402-001-N00
2. Ball or Roller Bearing Installation
___________________________________
A. General
(1)
When you assemble an inner race on its mating shaft, it is necessary to make the race become larger. Use controlled heat to make the race become larger. Put the inner race or the bearing assembly in hot oil to make it become larger.
(2)
When you clean an assembly with a bearing installed, be sure to remove or prevent damage to the bearing.
(3)
When you touch a ball or a roller bearing, wear clean gloves made of a lint free material.
B. Standard Tools and Equipment
(1) Tank - Hot Oil
C. Consumable Materials
(1)
G00834 Cloth - Cotton, lint-free
(2)
G01306 Gloves - Clean, Lint-free, Cotton
(3)
D00408 Lubricant - Dry Film, PMC 9934, DGF 123
(4)
D00390 Oil - Engine
D. Access
(1) Location Zone
412 Engine 1
422 Engine 2
432 Engine 3
442 Engine 4
E. Procedure
S 222-002-N00
(1) Make sure the shaft and the bearing races are satisfactorily circular and straight before you make them hot.
NOTE: This will help to prevent an incorrect fit.
____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
70-24-04
ALL ú ú N01 Page 201 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 882-003-N00
CAUTION: KEEP THE HOT OIL TANK CLOSED WHEN YOU DO NOT USE IT TO PREVENT
_______ CONTAMINATION.
DO NOT LET THE BEARING OR THE RACE STAY ON THE BOTTOM OF THE HOT OIL TANK. THIS CAN CAUSE THE BEARING OR THE RACE TO BECOME DIRTY WITH UNWANTED MATERIAL ON THE BOTTOM OF THE TANK. THIS CAN ALSO CAUSE THE PARTS TO BE PUT IN TEMPERATURES THAT ARE HIGHER THAN SHOWN.
CHANGE THE OIL AND CLEAN THE TANK REGULARLY TO DECREASE THE RISK OF CONTAMINATION.
(2) Put the bearing or the race in the hot oil tank that is full of engine oil.
NOTE: Make sure the oil is at a temperature of 225-250°F
____ (107-121°C). Keep the parts at least 3 inches (76.2 mm) above the bottom of the tank. Use a heavy screen or a group of rods to keep the parts off the bottom of the tank.
S 162-004-N00
(3)
Clean the unwanted oil off the journal with a clean lint free cloth.
S 642-005-N00
(4)
Apply a thin layer of the dry film lubricant to the journal.
S 422-006-N00
WARNING:_______DO NOT USE FORCE WHEN YOU INSTALL THE BEARING. IF THE BEARING IS HARD TO INSTALL, DISASSEMBLE THE PARTS. EXAMINE THE PARTS FOR BURRS AND THE CORRECT CLEARANCE. DAMAGE CAN OCCUR IF YOU USE FORCE TO ASSEMBLE THE PARTS.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(38)
