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CAUTION : DO NOT HOLD OR MOVE THE HYDROMECHANICAL UNIT BY THE TORQUE
_______ MOTORS. CHANGES TO THE CALIBRATION OF THE HYDROMECHANICAL UNIT CAN OCCUR.
(a) Remove the nuts (190) and washers (200) that attach the HMU to the fuel pump. Use the WRENCH SET, RUN ON/OFF - MEC/FUEL PUMP NUTS (856A1469G01) to remove the nuts that are difficult to reach.
(b) Remove the HMU from the fuel pump, with the FIXTURE HANDLING -HMU (856A1494G01).
- Pull the HMU lightly and carefully to let the fuel flow in the container.
- Remove the HMU from the fuel pump.
R (25) Remove and inspect the gasket (180) (Ref. TASK 70-21-00-918-002) R between the HMU and the fuel pump.
(26) Install the blanking cover on the HMU mounting pad on the fuel pump.
(27) Remove the nipples and plugs and discard the O-rings as follows:
(a) VBV open nipple (220) and O-ring (230).
(b) RACSB nipple (410) and O-ring (420). NOTE : Only applicable for non /P engines.
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(c) TBV nipple (410) and O-ring (420).
NOTE : Only applicable for /P engines
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(d) VBV closed nipple (320) and O-ring (330).
(e) PCR nipple (290) and O-ring (300).
(f) HPTACC nipple (470) and O-ring (480).
(g) LPTACC nipple (440) and O-ring (450).
PRE CFMI SB 73-0096
(h) SOV nipple (580) and O-ring (590).
NOTE : Only applicable for SAC engines.
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PRE CFMI SB 73-0114
(i) BSV nipple (250) and O-ring (260).
NOTE : Only applicable for DAC engines.
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(j) BSV nipple (250) and O-ring (260).
(k) VSV head nipple (380) and O-ring (390).
(l) VSV rod nipple (350) and O-ring (360).
(m) Cut and remove the lockwire and remove the PB plug (130) and O-ring (140).
(n) Cut and remove the lockwire and remove the PS plug (150) and O-ring (160).
(o) OVBD drain nipple (490) and O-ring (500).
(28) Install blanking plugs, caps and covers on all open ports of the HMU to prevent contamination.
Subtask 73-21-10-620-055
B. Do a HMU preservation procedure (Ref. TASK 73-21-10-600-002)
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Installation of the Hydromechanical Unit (HMU)
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific soft nose pliers No specific warning notice No specific 250-28UNF-2A x 50 in. bolts No specific access platform 1.5 m (4 ft. 11 in.) No specific Torque Wrench : range 36.00 to 220.00 lbf.in
(0.40 to 2.60 m.daN) No specific Torque Wrench : range 96.00 to 900.00 lbf.in
(1.00 to 10.00 m.daN) No specific Torque Wrench : range 180.00 to 1800.00 lbf.in
(2.00 to 20.00 m.daN) 856A1336 1 ADAPTOR SET, TORQUE - MEC FASTENERS 856A1469 1 WRENCH SET, RUN ON/OFF - MEC/FUEL PUMP NUTS 856A1494 1 FIXTURE HANDLING - HMU
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2442 * engine oil (Ref. 70-30-00) Material No. CP5070 * vaseline (Ref. 70-30-00) Material No. CP8001 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00) Material No. CP8002 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00)
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