MerCruiser Alpha One Gen II Gear Housing Diagram
Applicable for serial numbers 0L1000040 & Up
| Ref | Part # | Note | Qty | Description |
|---|---|---|---|---|
| - | 1623-815822A53 | 1 | Complete gear housing assembly (1.94, 1.81, 1.62, 1.47) | |
| - | 1623-815822A55 | 1 | Complete gear housing assembly (2.40, 2.00) | |
| 1 | 1623-815822A36 | 1 | Gear housing assembly | |
| 2 | 821526 | 1 | Filler block | |
| 3 | 17-37972 1 | 1 | Shift crank pin | |
| 4 | 16-57984 1 | 1 | Stud | |
| 10-806327 | 1 | Screw | ||
| 5 | 22-8M0058389 | 1 | Drain screw | |
| 6 | 12-19183 3 | 1,2 | 1 | Washer |
| 7 | 26-45577 1 | 1,2 | 1 | Seal |
| 8 | 17-43044 | 1 | Dowel pin | |
| 9 | 31-42647A1 | 1 | Roller bearing | |
| 10 | 11-859135 | 1 | Nut | |
| 11 | 45-853648 | 1 | Driveshaft assembly | |
| 12 | 15-42637A1 | AR | Shim kit | |
| 13 | 31-33138A1 | 1 | Tapered roller bearing assembly | |
| 14 | 853651 | 1 | Retainer | |
| 15 | 43-878087A2 | 1 | Gear set (forward & pinion) (1.94, 1.81, 1.62, 1.47) | |
| 43-878617A2 | 1 | Gear set (forward & pinion) (2.40, 2.00) | ||
| 16 | 12-92721 | 1 | Washer | |
| 17 | 11-35921 | 1 | Nut (5/8-18) | |
| 18 | 817276 1 | 2 | 1 | Face plate |
| 19 | 807929A1 | 2 | 1 | Carrier assembly |
| 20 | 26-66302 | 1 | 2 | Oil seal (serial # 0M400411 & below) |
| 26-864319 | 1 | Oil seal (serial # 0M400412 & up) | ||
| 21 | 26-896523 | 1 | 1 | O-ring (2.17 ID) |
| 22 | 817275A1 | 2 | 1 | Water pump assembly |
| 23 | 27-43033 1 | 1 | Lower gasket (old design - fiber) | |
| 27-8M0112903 | 1,2 | 1 | Lower gasket (new design - nitrile coated stainless steel) | |
| 24 | 27-817277 1 | 1,2 | 1 | Upper gasket |
| 25 | 26-816575A2 | 1,2 | 1 | Face seal |
| 26 | 10-816928 | 4 | Screw | |
| 27 | 47-43026T2 | 2 | 1 | Impeller |
| 28 | 28-8M0032833 | 2 | 1 | Impeller key |
| 29 | 816597A1 | 1 | Coupling assembly | |
| 30 | 25-21836 | 1,2 | 2 | O-ring |
| 31 | 23-816583 | 1 | Guide sleeve | |
| 32 | 8M0127949 | 1 | Lower shift shaft | |
| 33 | 53-29641 | 1 | Retaining ring | |
| 34 | 12-77674 | 1 | Washer (1/8 inch thick) | |
| 35 | 23-815921A20 | 1 | Shift shaft bushing assembly | |
| 36 | 26-89236 1 | 1 | 1 | Oil seal |
| 37 | 25-36318 | 1 | 2 | O-ring (.799) |
| 38 | 25-62702 1 | 1 | 1 | O-ring (.301) |
| 39 | 10-816928 | 2 | Screw | |
| 40 | 8M2009865 | 1 | Shift crank | |
| 41 | 818349T1 | 1 | Shift spool assembly | |
| 42 | 15-44491A1 | AR | Shim kit | |
| 43 | 31-30894A1 | 1 | Tapered roller bearing assembly | |
| 44 | - | 1 | Forward gear (see #15) | |
| 45 | 31-30895T | 1 | Roller bearing (Torrington #B-1616) | |
| 46 | 52-853594T | 1 | Sliding clutch | |
| 47 | 17-8M0100263 | 1 | Cross pin | |
| 48 | 24-30893 | 1 | Spring | |
| 49 | 44-850308 | 1 | Propeller shaft | |
| 50 | 43-828073A1 | 1 | Reverse gear (1.94, 1.81, 1.62, 1.47) | |
| 43-853593A1 | 1 | Reverse gear (2.40, 2.00) | ||
| 51 | 23-824108 | 1 | Spacer | |
| 52 | 68100 1 | 1 | Thrust ring | |
| 53 | 30-88957T | 1 | Ball bearing | |
| 54 | 25-31534 | 1 | 1 | O-ring |
| 55 | 818763A10 | 1 | Bearing carrier | |
| 56 | 31-30956T | 1 | Roller bearing | |
| 57 | 26-14077 | 1 | 1 | Inner oil seal (fishline cutter seal) |
| 58 | 26-12224 | 1 | 1 | Outer oil seal (fishline cutter seal) |
| 59 | 806105Q1 | 1 | Anode assembly | |
| 60 | 10-806290 | 2 | Screw | |
| 61 | 13-69432 | 2 | Lockwasher | |
| 62 | 14-18323 | 1 | Tab washer | |
| 63 | 79448 | 1 | Retaining ring | |
| 64 | 76214Q5 | 1 | Trim tab (1.81,1.62, 1.47) | |
| 31640Q4 | 1 | Trim tab (2.40, 2.00, 1.94) | ||
| 65 | 10-806327 | 1 | Screw | |
| 66 | 13-806210 | 1 | Lockwasher | |
| 67 | 11-859135 | 4 | Nut | |
| 68 | 10-65210 | 1 | Screw | |
| 69 | 13-35479 | 1 | Lockwasher | |
| 70 | 12-835467Q01 | 1 | Thrust hub | |
| 71 | 12-31211Q03 | 1 | Splined washer | |
| 72 | 14-816629Q | 1 | Tab washer | |
| 73 | 11-52707Q1 | 1 | Propeller nut | |
| 74 | 13-42351 1 | 1 | Washer | |
| - | 26-816575A3 | - | Gear housing seal kit | |
| - | 817275Q05 | - | Water pump repair kit | |
| - | 43-803073T1 | 3 | - | Lower unit rebuild kit |
| - | 43-803074T1 | 3 | - | Lower unit rebuild kit (2.40) |
| - | 31-803096T1 | 3 | - | Seal & bearing kit |
Note 1: Contents of seal kit QS-26-816575A3
Note 2: Contents of water pump repair kit 817275Q05
Note 3: Includes gears, bearings, shims, seals, clutch and prop nut to rebuild the lower unit
AR: As required
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