OMC parts 800 / Cobra outdrive drawings * How to videos

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OMC parts drawings * Outdrive repair help * Videos

Exploded view component drawings for SX, Cobra
OMC 400-800 outdrive repairs

  • Outboard Marine corporation 400/800 series upper and lower unit
  • Stringer electric shift components and intermediate housing diagrams
  • OMC Cobra and Cobra-SX Volvo Penta upper/lower gearcase
  • Outdrive how to repair video,s that show tools and new or used OEM parts if required. See model and hp. listed below.
  • How to video for 400/800 pressure testing upper-lower units and make your own pressure testing unit. Please see home page for parts look up.
  • Our service representative Wayne Coll has over 65 repair video list on his YouTube
  • Located in Canada please see Boatparts.ca

Click on drawing for large exploded view

Stringer OMC stern drive
Stringer OMC stern drive

400-800 stern drive upper gear-case. That is ball gear drive units for years 1971 to 1985.

Common replacement components are:

P/N 11410 stainless steel water pump shaft.

Stripped male spline from fast starts and lower unit propeller impact.

P/N 11412 harden steel drive shaft with groves worn in seal area. (stripped female spline from rust)

Rebuilt upper gearcase case assembly with GLM aftermarket OMC parts with new gears, drive shaft, water pump shaft, housing, bearings, ball gear, seals and water pump housing.

Exhaust housing parts and tops for 400-800 Stringer outdrives.

800 series high profile drawing

800 series high profile drawing

OMC Stringer stern drive upper gear case for years 1968 to 1977 with both press on and bolt on ball gears.

Case may come with or with out true coarse steering installed.

Used parts may be available please contact order desk for availability

Need a rebuilt upper gearcase click here for pricing details on our remanufactured units. Rebuilt upper gearcase case assembly parts with new gears, drive shaft, water pump shaft, housing, bearings, ball bear, seals and water pump housing with total parts value of $1267.09
400 series
400 series

400 Series OMC stern drive lower gear case exploded view drawing for years 1982 to 1986 with 3-1/4 inch smaller hub.

Drawing includes the following parts:

Drive shaft, gearcase, propeller shaft, drive shaft, bearing carriers and bearing retainers.

OMC stern drive years 1982 thru 1986. Lower unit components drawings are divided into 3 section.
 
1st drawing part numbers 1 to 22, second drawing part numbers 23 to 48 and third drawing part numbers 49 to 72.|

Layout show GLM Marine P/N, photo and OEM numbers of each component listed in gearcase.

Common replacement components are:

Seized bearings from low oil levels or water in the oil. Propeller impact damage resulting in broken gears and bent propeller shafts.
Old cracked seal that are 15 plus years old.

800 lower parts
800 lower parts

800 series for the following years: 1982, 1983, 1984, 1985 and 1986 lower unit gear-case. Large hub, drive shaft, drive shaft bearing, shifter rod and prop shaft installed.

GLM Marine replacement OMC parts for 800 series lower units years 1978 to 1985

Common replacement components are the same items as 400 series lower unit.

Stern drive is identical except for housing hub size on 800 series that is 4-1/4 inches, about 1/2 larger than the 400 series.

electric shift 1972 1977
electric shift 1972 1977

Stringer electric shift lower unit gear-case components for years 1972 to 1977

Electric shift outdrive inspection procedure

Common replacement components are:

Clutch spring and forward gear assembly from engine idol speeds over 650 rpm.

Broken shifter switch that hold only intermittent contact.

Poor wiring contacts in electrical terminals
Upper drive shaft bearing from low oil levels.

Need OMC outdrive components not listed see Marine engine.com for added information

intermediate housing
intermediate housing

400-800 and electric shift Stringer stern drive intermediate housing.

Common replacement components are:

Drive shaft ball gear due to normal wear or running the boat with stern drive not all way down in the water.

Bearing due to low oil or cracked seals. Drive shaft splines that did not have updated shafts installed.

Clutch packs that have water entering due to cracked seals that are in most cases 20 plus years old.

Upper gearcase drawing 1986-1992
OMC parts upper gearcase drawing 1986-1992

Cobra with u-joint driven drive shaft for years 1986 to 1992 and (1988 King Cobra) upper gearcase components.

Common replacement components are:

Broken gears or seized bearing from improper filling of upper/lower gearcase.
 
Worn out water pump and yoke area seals on unit with 800 hours or more. 

3.750 inch
3.750 inch

1986 - 1989 3 liter and 1987 - 1990 2.3 liter 4 cylinder with 3-3/4 inch small hub lower gear-case component tech drawing

Common replacement components are:

Propeller impact damage resulting in broken gears and bent propeller shafts.

Old cracked seal that are 15 plus years old.

How to repair video series for OMC outdrives show exploded view OMC cobra parts drawing. However we have 25 plus repair videos listed at time of listing. Click on you-tube icon to and select videos to see actual repairs, tools and parts required.

Contact the order desk if having problem with your repair as we have a no charge tech service representative who will help you if required. In most video,s tools and repair parts are listed by GLM part number.

4.250 inch drawing 1985-1995
4.250 inch drawing 1985-1995

1986 to 1993 V6, V8 and 1990 to 1993 large hub 4-1/4 inch lower unit 3.0 liter 4 cylinder engine

Common replacement components are:

Propeller impact damage resulting in broken gears and bent propeller shafts.

Old cracked seal that are 15 plus years old.

Shifter updates so shifter will moves with 2-5 foot pounds

Counter-rotating
Counter-rotating

1988 to 1993 V6, V8 counter rotating large hub 4-1/4 inch lower unit.

Common replacement components are:

First off this drive is not common and can be damage buy using a Cobra bearing carrier puller when changing the seals.

Propeller shaft is only 12 inches long and part of the bearing carrier unit. This outdrive should only be service by a marina that stock the parts to repair it.

King-Cobra
King-Cobra
King Cobra 1987 to 1989 V8 for 7.4 and 7.5 liter engines with hub size of 5 - 3/4 inch.
  • Please note: the true King Cobra lower unit should only be used for the 7.4L (454) and 7.5L (460) motors.
  • For the 5.7L (350) and 5.8L (351) motors, use the standard OMC Cobra lower unit gear-case parts.
  • Used parts that may not be listed here are the lower gear case, gears, clutch dog and propeller shafts.
  • Please contact order desk for availability.
OMC Cobra outdrive transom
OMC Cobra outdrive transom parts drawing
Cobra transom mount diagram

Common replacement components are:

Shift cable need replacement every 4-5 year unless shifter update has been installed in lower unit, if so then about every 15 years.

Broken or cracked u-joint bellows and exhaust bellows that are 10 plus years old.

Gimbal bearings that have not been grease every 50 hr. or 1 a year.
SX layout
SX layout

Cobra-SX Volvo Penta upper gear case layout with both new and used components
  • Yoke and drive shaft
  • U joint
  • Socket
  • Bearing
  • Seal kit upper
  • Thrust plate
  • Retaining ring

Manifolds and elbow illustration Ford-Chevy
Manifolds and elbow illustration Ford-Chevy

400 / 800 Series and OMC Cobra manifolds for use with Ford or Chevy engines

OMC engine exhaust failures with over heating problems can sometimes be traced to the exhaust systems.

However before manifold unit or engine is replaced check the water pump flow to the engine.

Test is done by testing the time to fill a 2 gallon container at idle speed of 550 rpm to 650 rpm.

Volvo Penta SX
Volvo Penta SX

Cobra SX Volvo Penta parts layout lower gear-case

Common replacement components are:

Bent propeller shafts form impact damage and cracked seals that are 15 plus years old.

transom
transom

Cobra SX and Volvo Penta transom components

Common replacement components are:

Shift cable need replacement every 7 to 10 years.

Broken or cracked u-joint bellows and exhaust bellows that are 10 plus years old.

Gimbal bearings that have not been grease every 50 hr. or once a year.

V8 boat engine
V8 boat engine

Engine components:
  • Carburetor kits
  • Fuel pumps
  • Fuel filter and water separator
  • Gasket rebuild kit
  • Thermostat kits
  • Engine manifold gasket set

Please contact our order desk for parts or video links not listed (416) 751-7326