OMC Cobra parts drawing *Upper gearcase 1-34

Upper gearcase exploded view component drawing years 1986 to 1992

Last updated on 6/2/2024, 2:04:04 PM

Exploded drawing shows internal components 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 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 list.
If you need lower unit Cobra parts and drawing click here

Cobra upper gear case layout

29930R upper

Rebuilt OMC upper gear housing assembly with new Yoke water pump shaft, gears and bearings $1529.95 – $1625.95 with trade in please see our rebuilt upper gearcase page

OMC Cobra assembly kit 21-16

OMC outdrive component rebuild sets click here for details on our complete rebuild sets

P/N 22-522-2 Complete OMC Cobra 21/16 upper rebuild kit 5.7 liter marine engine 1986 to 1993. $1399.99

P/N 22-532-2 Complete 21/17 set for 5.0 litre Chevy marine engine 1986 to 1993 $1395.95

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 $1395.95

P/N 22-542-2 4.3 Liter V6 (21/19) upper years 1986 to 1993 $1395.95

87654 OMC gearcase seal kit

P/N 87654 Seal kit / 987603, 986364 $53.89
Included
81180 O-Ring
86530 Oil seal (large)
82380 O-Ring
34771 Gasket
82430 O-Ring
81280 O-Ring
86610 Oil seal (small)
34730 Gasket
33910 Gasket
81100 O-Ring

29900 Used Cobra upper case OEM 984518

P/N 29900 (Empty) upper gear housing / 984518 (Used) OEM gearcase in good condition $369.95

22520 ratio 21-16 22560

22540 Aftermarket gears V6 ratio 21-19

Item 2

P/N 22520 Gear set 21:16 ratio for V8 / 983825 $799.89

P/N 22560 21:18 gear ratio V8 / 983826 $433.89

P/N 22540 Gears 21:19 ratio V6 / 984012 $799.89

P/N 22544 Gear set 21/17 ratio V8 5.0 liter, 305 Chevy 5.8 liter and 351 E.F.I. Ford 7.5 liter 460 V8 / 983635 $560.89

21540 OMC Bearing

Item 3

P/N 21540 Roller top pinion bearing / 983891 $39.89

This bearing is often the 1st bearing in upper OMC Cobra gearcase to seize up in upper gearcase do to being run with low or no oil. The supporting bearing carrier is also damaged in most cases do to bearing outside race being spun in the aluminum.

21541

Item 4

P/N 21541 OMC pinion bearing fits in lower section on pinion retainer OEM number is 983892 $43.89

28460 Pinion nut

Item 5

P/N 28460 Pinion nut / 911753 $48.95

28318 Drive Shaft Parts

Item 6

P/N 28325 Drive shaft U joint and water pump shaft assembly / 983880 $699.95

Please phone to contact order desk if you would like to receive this unit with the yoke drive shaft not joined to the yoke as per-load would be hard to judge with unit complete.

28315 OMC Yoke drive shaft

Item 8

P/N 28315 Yoke drive shaft / 912212 $147.89

28030 U joint

Item 9

P/N 28030 u joint heavy duty / 915717 $51.99

28100 Socket

Item 10

P/N 28100 Socket / 3852565 $89.89

28320 OMC Yoke and water pump shaft

Item 11

P/N 28320 Yoke & water pump impeller shaft / 984264 $373.89

Note water pump shaft is often bent if gears lock up. Best to check with dial indicator before unit is taken apart.

86520

Item 12

P/N 86520 Oil seal / 911685 $8.89

Note this oil seal is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

82380 OMC O-ring

Item 13

P/N 82380 O ring (1 unit) / 911686 $4.89

Note this o ring is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

21542

Item 14

P/N 21542 OMC timken roller bearing / 983877 $79.89

22525 Centering cone OEM 912029

Item 15

P/N 22525 Centering cone / 912029 $45.95

28470 nut

Item 16

P/N 28470 U joint nut / 911937 $26.89

21543 Bearing Cobra water pump end

Item 17

P/N 21543 Roller bearing / 983878 $51.89

34771 OMC Gasket

Item 18

P/N 34771 Gasket / 911698
Note this gasket is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

Item 19

P/N 82430 O ring / 911700
Note this o ring is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

86610 Oil seal

Item 21

P/N 86610 oil seal / OEM 916058 $14.89
Note this oil seal is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

12092 Aftermarket water pump

Items 22 to 30

P/N 12092 Water pump kit $49.99

Included
Wear plate, 89950 Impeller, 12391 pump, 86630 seal and pump housing including the 34770 Gasket.
Note this o ring seal and two gasket are included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

89950 Impeller

Item 24

P/N 89950 Impeller OEM-983895 $19.89 (Included water pump kit P/N 12092)
Click here for our OMC Cobra impeller removal & installation video

12391 OMC Water pump liner

Item 25

P/N 12391 Water pump liner / 911844
Note unit is included in water pump kit.

39630 outdrive transom gasket

Item 27

P/N 39630 OMC Cobra outdrive gasket and parts installation kit OEM-508105 $9.95

Item 28
P/N 33910 Gasket OEM 911733

Note this gasket is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

81100

Item 29

P/N 81100 Nylon seal or o ring (5 units) OEM 303067 $9.89

Note this gasket is included in our GLM Marine products aftermarket OMC upper gearcase seal kit P/N 87654

12405 pump housing aftermarket

Item 30

P/N 12405 Housing 984744 $44.95
Note this part is Included in the water pump kit P/N 12092

21676 Washer

Item 31

P/N 21676 Washer stainless steel OEM 911697 $4.95

23202 OMC retainer

Item 32

P/N 23202 Retainer 911752 $19.95

21111 Cover nut

Item 33
P/N 21111 Cobra cover nut 911751 $69.89

Many of the above parts will require the use of 680 Loctite for oil seals and OMC / Johnson / Evinrude gasket retainer compound for use on all o rings and gaskets.

Exploded view Cobra parts drawing 34 to 53