OMC parts *Exploded view drawings *Outdrive repair help video
GLM Marine aftermarket OMC sterndrive parts Johnson/Evinrude parts
drawings
Outboard Marine corporation sterndrive series
Stringer electric shift component and intermediate housing
diagrams
OMC Cobra sterndrive and Cobra-SX Volvo Penta gearcase
OMC sterndrive how to repair video,s that
show Johnson/Evinrude tools and new or used OEM parts if required. See Cobra sterndrive model and hp listed below.
How
to video for pressure testing upper-lower units and make your own pressure testing unit. Please see home page for parts look up and Evinrude/Johnson outboard
manuals.
Our service representative Wayne Coll has over 45 OMC repair videos, do a Google search under Wayne Coll YouTube videos
Located in Canada please see Boatparts.ca for GLM Marine aftermarket Johnson/Evinrude boat parts
See OMC sterndrive parts and lower unit changes for years
1967 to 1993
400-800 sterndrive gearcase. Ball gear drive units for years 1971 to 1985.
Common Outboard Marine corporation
replacement component are:
Part number 11410 stainless steel water pump shaft with stripped male spline from fast
starts and propeller impact.
Part number 11412 harden steel drive shaft with groves worn in seal area. (stripped
female spline from rust)
Rebuilt OMC upper gearcase case assembly with GLM marine aftermarket component with new
gears, drive shaft, water pump shaft, housing, bearings, ball gear, seals and water pump housing.
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 component value of $1267.09
400 lower unit drawing
400 Series OMC sterndrive gearcase exploded view drawing for years 1982 to 1986 with 3-1/4 inch smaller hub sterndrives.
Stern drive years 1982 thru 1986. Boat parts 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 part number, photo and OEM numbers of each OMC part listed in gearcase.
Common repairs and boat
parts are:
Seized bearings from low oil levels or water in the oil.
Propeller impact damage resulting in
broken gears and bent propeller shafts.
Old boat were outdrives have cracked oil seals were the gearcase is 15 plus
years old in need of repair.
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.
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.
Cobra parts drawing
How to repair video series that show exploded view 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 for Johnson/Evinrude outboard motors with drawings. Having problem with your repair
parts 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 Marine part number.
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
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
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.
OMC 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 used parts availability.
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
Cobra-SX Volvo Penta upper gear case layout with both new and used parts
Yoke and drive shaft
U
joint
Socket
Bearing
Seal kit upper
Thrust plate
Retaining ring
Manifolds and elbow illustration Ford-Chevy
400 / 800 Series and OMC Cobra manifolds for use with Ford or Chevy engines
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.
Most common boat repair is a crack or gasket leak inside the manifold that allows engine exhaust
pressure as high as 100 lbs to enter the water jackets of the manifold. This reduces or stops the 20 to 30 lbs water pump
flow
Volvo Penta SX
Cobra SX Volvo Penta parts layout lower unit gear-case
Common replacement OMC outdrive parts are:
Bent
propeller shafts form impact damage
Cracked seals that are 15 plus years old.
transom
Cobra SX and Volvo Penta transom parts
Common replacement parts 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.
Johnson/Evinrude outboard water pumps and impellers
V8 Boat engine parts
Boat engine parts:
Carburetor kits
Boat fuel pumps
Boat fuel filter and water separator
Gasket
rebuild kit
Thermostat kits
Engine manuals
Engine manifold gasket set
Used OMC sterndrive rebuild boat parts
Used OMC sterndrive rebuild boat parts for sale.
Contact us if you want an item listed with picture
that you may require or any used boat parts required.
Specifications for your OMC sterndrive boat should be noted
before contacting us, items like serial number, year, hp. and gear ratio may be required to help you.
Need boat parts
or the whole OMC outdrive. Items not listed on our web site contact us for hard to find components.
Please contact our order desk (416) 751-7326 for OMC boat repair parts, outboard motors
and OMC repair video links not listed
Outdrive lower unit changes years 1967 to 1993
1967 to 1977 Electric
shift with oil pump 8 bolt swivel
1982 to 1985 straight mechanical shift 400/800 models
1986 to 1993 OMC
Cobra and in 1988 the King Cobra (clutch dog unit)
By authors Trish Dougherty / Wayne Coll all rights reserved
1967 to 1970 Electric shift model with 8 bolt in swivel housing the electric shift required 12 volts
to stay engaged. In 1970 to 1977 the swivel housing was changed to 10 bolt pattern.
In 1977, they discontinued
the production and manufacturing of the Stringer electric shift unit. They opted to keep the upper gear housing design the
same as with the Stringer model.
In 1978 completely redesigned the lower unit, this new design called for a sliding
clutch dog in the gearcase that would engage the forward and reverse gear with the aid of a hydraulic pump. This clutch
was manually engaged by the use of a shift cable which contained 2 inner cores (one or reverse, one for forward). The new
models were called the 400 series for 4 cylinder engines and the OMC 800 series for the straight 6 cylinder, V6 and V8 engine.
The early models between 1978 and 1981 unit used a hydraulic pump
to assist the hydraulic shift cable to engage the clutch dog into gear. In 1982, engineers redesigned the lower unit
once again and the 1978 to 1981 was recalled and designed the sterndrive to shift with a mechanical shift cable. They removed
the hydraulic shift assist pump as they found this wasn’t working properly rounding off the forward gear and clutch
dog lug.
With some of the new shifting parts the new design called for the outdrive were still called the 400 /
800 series models – but were widely referred to as the mechanical shift models. This version of the 400 and 800 series
were produced in Canada and the USA up to the year 1985.
Outboard Marine Company re-engineered their OMC boat sterndrive in 1986 and introduced the Cobra gearcase. Their new
modern boat parts manufacturing facility was located in Lexington, Tennessee. These new models were available in a variety
of OMC boat motor options; including a 2.3 liter Ford 4 cylinder years 1986 to 1987, 3.0 liter Chevy, 5.0 liter – 5.7
liter – 5.8 liter Ford and Chevy small block V8 engine ’s and the monster 7.5 liter 460 Ford big block V8 years
1987 to 1988 King Cobra. The new OMC King Cobra parts drawing will show unit no longer used the poorly designed ball gear system and used the modern u-joint style drive system.
The early Cobra models did have some technical design flaws which caused some problems when shifting. The original
clutch dog had a 3 degree undercut on the top of the tooth; this angle wasn’t sufficient enough to keep the clutch engaged
into the gear in certain instances. The clutch was updated to a 5 degree undercut; and a shift interrupter switch was added.
Along with an updated design in 1992 for the shift detent parts these changed did help with some of the shifting
issues the drive may experience. One major difference with the Cobra models compared to the Mercruiser was that when the upper
housing and lower gear case were mated together – the oil cavities were connected and an oil reservoir was not needed.
The outdrive needed to be filled from the bottom fill plug until the oil reached the dipstick in the top cover of the upper
housing.
Another difference was that the water pump assembly and impeller were installed in the upper gear case
instead of lower unit.
In 1993, Outboard Marine Corporation along with Volvo entered into a joint venture and produced
a hybrid model knows as the Cobra SX. This new design was all Volvo engineering with the transom being the original design.
This hybrid model is also referred to as the ‘cone clutch’ model; the shifting components are heavier duty and
no longer used the clutch dog system.
Outboard Marine Corporation including the Johnson/Evinrude outboard line
officially went out of business in 1998 when Volvo purchased their rights and their manufacturing facility in Lexington. OEM
parts are still being manufactured through BRP (Bombardier Recreational Products). Many OEM parts are still interchangeable
with Johnson/Evinrude outboards; and some outboards still use the identical lower housing as the Cobra sterndrive model. Rumors
have it that the 2 stroke 150 hp Johnson/Evinrude outboards had high repairs cost do to engine carbon build up at low speeds
was all-so a factor.
T.C. Electronics/Marine (416) 751-7326 Copyright 2002 to 2024 all rights reserved
