T.C. Electronics / Marine Home Page | Troubleshooting worn out OMC ball gears

OMC parts *Cobra sterndrive drawings *How to videos

OMC Cobra parts 1 to 24 upper gearcase layout

Upper gearcase exploded view parts drawing years 1986 to 1992

  • Exploded drawing shows internal parts and their relationship with the stern drive unit.
  • Detailed step by step OMC stern drive illustrations will aid making repairs to your outdrive.
  • If help is required, contact our service tech for help with your OMC stern drive repair at (416) 751-7326. Please have horsepower and year of stern drive boat ready when calling.
  • You can print 3 or 4 pages to have your own upper gearcase parts list.

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Cobra upper gear case layout
Cobra upper gear case layout

rebuilt
rebuilt

New upper gear housing assembly $1795.29
Please see our Cobra complete
upper gear case page for a complete selection of upper gear housing assemblies.

29930R rebuilt upper
29930R rebuilt upper

Used upper unit $1195.09 with trade in please see our used upper gearcase page

Rebuilt upper gear housing assembly with new
P/N 28320 Yoke water pump shaft, gears and bearings $1495.29 with trade in please see our rebuilt
upper gearcase page

OMC Cobra upper assembly kit  21-16
OMC Cobra upper assembly kit 21-16

Click here here for details on our complete rebuild kits 

P/N 22-522-2 Complete 21/16 upper gear set for 5.7 liter marine engine 1986 to 1993 $1130.09

P/N 22-532-2 Complete 21/17 kit for 5.0 litre Chevy marine engine 1986 to 1993 $1130.09

P/N 22-562-2 Before 1988 complete 21/18 upper for 5.0 liter V8 Ford or 3.0 litre 4-cylinder small hub lower unit marine engine years 1986 and up $1130.09

P/N 22-542-2 4.3 Liter V6 (21/19) upper kit years 1986 to 1993 $1130.09

87654 Upper gearcase seal kit
87654 Upper gearcase seal kit

P/N 87654 Seal kit OEM-987603, 986364 $35.09
Included in seal kit
81180 O-Ring
86530 Oil seal
82380 O-Ring
34771 Gasket
82430 O-Ring
81280 O-Ring
86610 Oil seal
34730 Gasket
33910 Gasket
81100 O-Ring

29900 Used OEM 984518
29900 Used OEM 984518

Item 1

P/N 29900 New empty upper Cobra gear housing $709.29

P/N 29900 Upper gearcase assembly OEM 984518 (Used) $499.95

22520 ratio 21-16
22520 ratio 21-16
22560 ratio 21-18
22560 ratio 21-18
22540 Aftermarket gears V6 ratio 21-19
22540 Aftermarket gears V6 ratio 21-19

Item 2

P/N 22520 gear set (21:16 ratio) V8 OEM-983825 $685.00

P/N 22560 21:18 gear ratio V8 OEM-983826 $654.00

P/N 22540 Gears (21:19 ratio) V6 OEM-984012 $692.00

P/N 22544 Gear set (21/17 ratio) V8 5.0 Liter 305 Chevy 5.8L 351 E.F.I. Ford 7.5L 460 Ford V8 OEM-983635 $675.00

21540 Bearing
21540 Bearing

Item 3

P/N 21540 Bearings OEM-983891 $34.09

21541
21541

Item 4

P/N 21541 Bearing OEM-983892 $41.09

28460 Pinion nut
28460 Pinion nut

Item 5

P/N 28460 Pinion nut OEM-911753 $29.09

28318 Drive Shaft Parts
28318 Drive Shaft Parts

Item 6

P/N 28325 Drive shaft-U-joint and water pump shaft assembly OEM-983880 $413.09

28315 Yoke
28315 Yoke

Item 8

P/N 28315 Yoke drive shaft OEM-912212 $100.09

28030 U joint
28030 U joint

Item 9 

P/N 28030 u joint heavy duty OEM-915717 $40.00 
   

28100 Socket
28100 Socket

Item 10

P/N 28100 Socket OEM-3852565 $42.09

28320 Water Pump Shaft
28320 Water Pump Shaft

Item 11

P/N 28320 Yoke & water pump impeller shaft OEM 984264 $245.09

21542
21542

Item 14

P/N 21542 Bearings OEM-983877 $65.09

22525 Centering cone OEM 912029
22525 Centering cone OEM 912029

Item 15

P/N 22525 Centering cone OEM-912029 $28.09

28470 nut
28470 nut

Item 16

P/N 28470 U-joint nut OEM-911937 $17.09

21543
21543

Item 17

P/N 21543 Bearing OEM-983878 $41.09

12092 Aftermarket water pump kit
12092 Aftermarket water pump kit

Items 22 to 30P/N 12092 Water pump kit $41.00

Included in water pump kit
Wear plate, 89950 Impeller, 12391 Pump and 86630 Seal with Pump housing including 34770 Gasket.

89950 Impeller
89950 Impeller

Item 24

P/N 89950 Impeller OEM-983895 $13.09 (Included water pump kit P/N 12092)

Click here for our Cobra impeller removal & installation video

39630 Outdrive Installation Kit
39630 Outdrive Installation Kit

Item 27

P/N 39630 Outdrive gasket installation kit OEM-508105 $5.09

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