MGA Part Numbers

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MGA Part Numbers - AEH460
Washer for Spindle (thrust) - (see item 17)

ITEM  PART NO.  SPL.PAGE  DESCRIPTION                                                            
  7   AEH444    TC.A.6    Shaft -half speed -(half speed shaft, engine, Twin Cam) -changed to
    AEH619 Com.(E)313 -always use AEH619 in lieu of AEH444 together with 1 off spindle
    AEH630 prior to (E)313
  7   AEH619    TC.A.6    Shaft -half speed -(half speed shaft, engine, Twin Cam) Com.(E)313-
    was AEH444 -always use AEH619 in lieu of AEH444 together with 1 off spindle AEH630
    prior to (E)313
  8   AEH495    TC.A.6    Spindle -oil pump driving -(half speed shaft, engine, Twin Cam)-
    changed to AEH620 Com.(E)313 -always use AEH620 in lieu of AEH459 together with 1 off
    shaft AEH619 prior to (E)313
  8   AEH620    TC.A.6    Spindle -oil pump driving -(half speed shaft, engine, Twin Cam)-
    Com.(E)313 -was AEH495  -always use AEH620 in lieu of AEH459 together with 1 off
    shaft AEH619 prior to (E)313
  x   1H1191    TC.A.13   Pump assembly -oil -(oil.pump, engine, Twin Cam) -(same for all MGA)
  9   7H1790    TC.A.13   Body (with plug) -(oil.pump, engine, Twin Cam) -(same for all MGA)
 10   17H1717   TC.A.13   Cover -(oil.pump, engine, Twin Cam)
 11   HZS0408   TC.A.13   Screw for cover (short) -(oil.pump, sump, engine, Twin Cam)
 12   HZS0414   TC.A.13   Screw for cover (long) -(oil.pump, sump, engine, Twin Cam)
 13   LWN204    TC.A.13   Washer for screw (spring) (2) -(oil.pump.cover, oil.pump, engine, Twin
    Cam)
 14   7H1793    TC.A.13   Dowel (2) -(oil.pump.cover, oil.pump, engine, Twin Cam)
 15   7H1792    TC.A.13   Shaft with rotors -driving -(oil.pump, engine, Twin Cam)
 16   11G10     TC.A.13   Joint -pump to crankcase -(oil.pump, engine, Twin Cam)
 17   AEH460    TC.A.13   Washer for spindle (thrust) -(oil.pump, engine, Twin Cam)
 18   1H9192    TC.A.13   Strainer assembly -oil -(oil.pump, engine, Twin Cam)
 19   1H1198    TC.A.13   Joint -strainer to pump -(oil.pump, engine, Twin Cam)
      HNS0406   TC.A.6    Screw -plate to crankcase (3) -(half speed shaft, engine, Twin Cam)
 20   HNS0406   TC.A.13   Screw -strainer to pump (3) -(oil.pump, engine, Twin Cam) -changed to
    HNS0407 Com.(E)499 -always use HNS0407
 20   HNS0407   TC.A.13   Screw -strainer to pump (3) -(oil.pump, engine, Twin Cam) Com.(E)499-
    was HNS0406 -always use HNS0407
 21   LWN304    TC.A.13   Washer for screw -spring (3) -(strainer to pump, oil.pump, engine,
    Twin Cam)

For the MGA pushrod engines, camshaft turns clockwise, and the oil pump drive gear is pushed downward against the alloy oil pump housing where thrust is taken by the spindle flange against the oil pump, no thrust washer required.

For the MGA Twin Cam engines, the half-speed shaft turns anti-clockwise, and the oil pump drive gear is pushed upward against the iron engine block. This application needs the thrust washer above the spindle gear face.

MGA Twin Cam oil pump drive gear)
Notice that the helical gears on the Twin Cam half-speed shaft and oil pump drive gear and tachometer drive gear all have the helix angle of the teeth in opposie direction from the pushrod engines. This is because the Twin Cam half-speed shaft is gear driven and turns in oppposite direction, but the oil pump and tachometer drive need to turn in same direction as the pushrod engines.
See tech article TC-303E for drawing errors in the SPL. For sure this thrust washer must be installed above the spindle drive gear, not below it.