Alpha 1 & Gen. 2 Outdrive Parts *Drawings *Videos

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Alpha One shims and bearings (upper gearcase)

Mercruiser shims and bearings for outdrive upper gearcase

  • Upper gear case GLM aftermarket Alpha One shims come in packs of 5
  • Tapered roller bearings for Mercruiser stern drive upper gearcase R/MR and years 1984 - up
  • P/N 23260 bore size 1.9375 and #23261 bore size 1.7813 available for top cover

Exploded view Mercruiser drawings
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21540 Mercruiser Bearing
21540 Mercruiser Bearing

P/N 21540 OEM 31-35990A1 983891 $34.95

23270
23270

P/N23270 Shim kit OEM 15-36178A1 for bearings # 21540 / 21550 / 21560 $6.29

21520 set
21520 set

P/N 21520 Bearing set (includes spacer) OEM 31-35988A2 $131.29

23280
23280

P/N 23280 OEM 15-35980A1 $7.29

21510 Upper Bearing Alpha One 31-61100A1

21510

P/N 21510 1972 to 1995 OEM 31-6100A1 upper cover bearing 1-15/16" $28.95

23260
23260

P/N 23260 OEM 15-45691A1 $6.29

21511
21511

P/N 21511 Bearing (1996 - up) OEM 31-32575A1 $17.29

23261
23261

P/N 23261 kit for P/N 21511 bearing $5.29