DMC:V2500-A1-71-00-0000-00A-270A-B|Issue No:001|Issue Date:2013-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

V2500-A1

Common Information

TASK 71-00-00-700-066-A00 Adjust Procedure For The Oil Pressure Pump Trim Valve, Testing-000

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

Name	Manufacturer	Part Number / Identification	Quantity	Remark
Sliding Caliper	LOCAL	Sliding Caliper

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

1. Obtain corrected oil pressure at idle. Refer to TASK 71-00-00-700-005 for limits. Record the corrected oil pressure.
  NOTE
  The trim valve adjustment has to be done only if oil pressure pump performance deterioration causes engine oil pressure below limit (MOP). Refer to TASK 71-00-00-810-011 fault isolation for troubleshooting low MOP.
2. Identify the trim valve located on the oil pressure pump and filter assembly. Refer to Figure.
3. Measure and record the dimension L. Using a Sliding Caliper 1 off. Refer to Figure.
4. Temporary identify relative position of trim valve to pump casting. Use marker.
5. 1. Hold the trim valve screw with a suitable wrench and loosen self locking nut. Turn counterclockwise to loosen the self locking nut.
    NOTE
    Rotation of the trim valve by 1/4 turn clockwise, increases the MOP approximately by 9 PSI at engine idle condition.
    NOTE
    The trim valve should be adjusted to obtain a corrected MOP not more than 10 PSI above the minimum required limit.
  2. Turn clockwise the trim valve screw as necessary.
  3. Record the rotation amount of the trim valve screw.
  4. Hold the trim valve screw with a wrench and turn clockwise the self locking nut.
  5. Torque the locking nut to between 290 to 370 lbf.in (33 to 42 Nm).
6. Measure and record the dimension L. Use a sliding caliper
7. Do an idle leak check. Ref TASK 71-00-00-700-003-A00 (TESTING-003)
  NOTE
  The engine oil temperature must be 93 deg C (200 deg F) or greater
8. Check and record the measured oil pressure at idle
9. 1. If corrected MOP is above limit, clear the engine for further service
  2. If corrected MOP is still below limit, start procedure again
  3. If minimum MOP can't be achieved reject the pump