PART NO. SPL.PAGE DESCRIPTION
1H3138 15.F.1 Oil seal -(front cover assy, GB assy, 1500, Com GB A8011, none before)
1H3138 16.F.1 Oil seal -(front cover assy, GB assy, 1600 and 1600-MK-II) -changed to
22H475
1H3138 TC.F.1 Seal -oil -(front cover, gearbox assy, Twin Cam)
Seal Dimensions:
Inside Diameter: 1.062 in (27.0 mm) -- 1-1/16" shaft size
Outside Diameter: 1.756 in (44.5 mm) -- 1-3/4" housing bore
Width: 0.312 in ( 7.9 mm) -- 5/16" seal thickness
Original MGA part numbers:
BMC 1H3138 Com.(g)A8011
BMC 22H475 New part number
Additional part numbers:
BMC 88G545
BMC OS4498
BMC 1A3636
BMC 9204Z90
BMC ATJ2034
Moss Motors USA 120-300
Victoria British 2-2250
Early production MGA did not have a rubber seal at the front of the gearbox. Those gearboxes used a mechanical scroll seal. They can be converted to rubber front seal by installing the later model front cover.
More information about this original type part, and some modern replacement type rubber lip seals, can be found in the gearbox tech article GT-115
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