Mercruiser outdrive bearings *Upper *Lower gearcase

GLM Marine aftermarket upper and lower gearcase bearings years 1964 and up.
Compatible with all MC-1/R/MR/Alpha 1 models except Bravo and TR/TRS outdrives and 1.32 ratio models
Tech support Exploded view drawings
If more service help is required, contact our service tech for help with troubleshooting your outdrive at (416) 751-7326. Please have the horsepower and the year of your stern drive ready

Lower Unit

21580

21584

21570 drive shaft

P/N 21580 Drive shaft bearings #31-36387A1 $46.99
MC / Alpha 1 / Alpha 1 Gen 2 models (1984 - 1997)
Serial numbers 6225577-0K999999

P/N 21584 #31-33138A1 $48.99
Alpha 1 Generation 2 (1998 & up)
Serial numbers 0L100040 & up

P/N 21570 #31-53079A1 $29.99

MC-1/R models
120/140 (1970 - 1977) serial numbers 2791957-6225576
470/485 (1976 - 1982) serial numbers 4208730-6225575
165 (1970 - 1981) serial numbers 2763442 & up
888/225/233/898/228/250/260/R (1971 - 1983) serial numbers 3106717 & up

21610 pinion

P/N 21610 Pinion #31-42647A1 $43.95

11410 roller

P/N 11410 Propeller shaft #31-30956 $19.99

All models except Bravo/TR/TRS

11420 prop shaft

P/N 11420 Forward gear - inside #31-30895 $14.95
MC-1/R/MR/Alpha 1/Gen 2 (1966 & up) serial numbers 2063741 & up

21590 forward gear

21591

21593

P/N 21590 Forward gear #31-35928T1 $69.99
MC-1/R/MR/Alpha 1/Gen 2 (1964 & up) serial numbers 1648188 & up
1.875 inch I.D.
3.500 inch O.D.

P/N 21591 #31-828437A2 $115.95
Alpha 1 Generation 2 (some models)
1.750 inch I.D.
3.500 inch O.D.

P/N 21593 #31-828439A2 $128.95 Alpha 1 Gen 2 (For forward gear small bearing)
1.875 inch I.D.
3.500 inch O.D.

21620 reverse gear

P/N 21620 Reverse gear #30-88957T $44.99 All models (1964 & up) except Bravo/TR/TRS

25110 lower gearcase rebuild kit 31-803068T1

P/N 25110 Seal and bearing kit with shims #31-803068T1 $269.99
Compatible with MC-1/R models 1970 - 1983 with drive shaft with pre-load pin

P/N 25120 Lower unit kit #31-803090T1 $267.99 All MR / Alpha 1 models 1984 - 1990
Includes all seals and shims

Upper Gearcase

21520 bearing assembly

P/N 21520 Yoke and gear bearing assembly #31-35988A12 $179.99 All Mercruiser models (1964 -1997) except 1.32 ratio and Bravo/TR/TRS models
Includes spacer

21540 driven gear

21560

P/N 21540 Driven gear #31-359900A1 $35.99
All models (1964 - 1990) except 1.32 ratio and Bravo/TR/TRS models
Alpha 1 Generation 2 (1991 and up) 2.40/1.98/1.84/1.65 ratios

P/N 21560 31-32573A1 $47.99
Alpha 1 Gen II (1991 & up) serial numbers 0D469859 & up for 1.50 ratio only (V8 motors)

21510 top cover

21511

P/N 21510 Top cover 31-61100A1 $33.99
O.D. 1-15/16 inch *Please measure outside diameter of yours if you are unsure of what model you have
120/140 (1971 - 1982) 1.98 ratio serial numbers 3213658-6225576
160 (1967 - 1971) 1.68 ratio serial numbers 2182198-3134193
165/888/225/233/898/228/250/260 (1971 - 1982) all ratios serial numbers 3213658 & up
R/MR/Alpha 1/Generation 2 (1983 - 1995) all models serial numbers 6225577-0F679999

P/N 21511 31-32575A1 $16.00
O.D. 1-25/32
Alpha 1 Gen II (1996 & up) serial numbers 0F680000 & up for 2.40/1.94/1.81/1.62/1.47 ratios

Gimbal Housing

21905 gimbal

P/N 21905 Gimbal #30-862540A3, 30-60794A4 $69.99
Compatible with all models

Installation / Removal Tools

90095 carrier puller tool

P/N 90095 Carrier puller $104.99 Adjustable arms makes this puller universal for all models including outboards
5 ton capacity

90190 Bearing carrier retainer wrench 91-61069T

P/N 90190 Carrier retainer wrench #91-61069T $112.99
Installs and removes the retainer nut on all models including Bravo and TRS models

90240 drive shaft retainer wrench

P/N 90240 Drive shaft retainer wrench #91-43506 $44.99 For removing and installing threaded retainer

90295 pinion bearing tool

P/N 90295 Tool assembly $99.99
Includes:
90280 Puller rod #91-31229
90260 Pinion installation tool OEM 91-38628T
90270 Driver head #91-36569T
90290 Spacer