OMC electric shift gear-head rebuild (how to series)
OMC Stringer sterndrive lower gearcase step by step rebuild
electric shift gear-head assembly
Last updated on 6/2/2024, 1:42:11 PM
- Gear-head rebuild help for 8 or 10 bolt swivel housings
- Prop shaft bearing retainer (gear-head) years 1967-1971
- Swivel housing does not need to be separated from gearcase for this repair
- Two oil seals and bearing will be removed
- Three oil seal and one bearing will be installed
- Electric shift step by step pictures of outdrive rebuild
- How to series for Electric shift outdrive forward or reverse coil repairs.
- Clutch spring and swivel housing rebuilt
381849 Used gear head assembly OEM 381849
By author Trish Dougherty
680 Loctite is used on this bearing retainer (gear-head-assembly) to install 3 seals when rebuilding 1971 to 1977 OMC stern drive.
OMC outdrive showing sand blasted gear-head area
Sandblast or wire brush lower unit outdrive area, so not particles fall into stern-drive when we pull gear-head assembly out.
A Clean out screw hole with 13/64 drill
Clean out screw hole with 13/64 drill.
B Drill out 5/8 inch deep
Drill out 5/8 inch deep.
C Tap size is 1/4 inch 20 n.c
Tap size is 1/4 inch 20 national coarse thread.
D Re-tap about 1/2 inch deep
Re-tap about 1/2 inch deep.
E 7/16 wrench required
7/16 wrench required.
F Only 2 bolt holes required
Only 2 bolt holes required.
G
Remove the 4 screws from gear head assembly.
H
Remove old o rings.
I Install new o rings from seal kit P/N 87620
Install new o rings P/N 87620.
J Remove gear-head with bearing carrier puller
Remove gear-head with bearing carrier puller.
K Can allso just pry out just holding screw
Can allso just pry out just holding screw.
L Remove by hand after 3/8 of an inch
Remove by hand after 3/8 of an inch.
M
Can now remove screws.
Notice groove on water area of drive shaft and groove on oil seal area of the lower part of drive shaft
Notice groove on oil seal area the lower part of drive shaft .
Wire brush bearing retainer
Remove o-ring and clean old gasket compound from unit with fine wire brush
Machine new oil seal area to 1.500 inches
Lathe will be required to machine front face to hold extra oil seal. Machine new oil seal area to 1-1/2 inch, you can be over by up to .007 if using 680 and .003 with 609 green Loctite retaining compound. Note Loctite products are listed under tools if you need to purchase this item.
Remove old bearing
Remove old seals and bearings by pushing on bearing. Then sandblast or wire brush old gasket compound off gear-head assembly. Note Johnson gasket retaining compound is listed under tool if required.
Clean bearing and seals of any 680 loctite
Machine new oil seal area to 1.500 inches
By author Trish Dougherty
Lathe will be required to machine front face to hold extra oil seal. Machine new oil seal area to 1-1/2 inch, you can be over by up to .007 if using 680 and .003 with 609 green Loctite retaining compound. Note Loctite products are listed under tools if you need to purchase this item.
Remove old bearing and seals
Remove old seals and bearings by pushing on bearing. Then sandblast or wire brush old gasket compound off gear-head assembly. Note Johnson gasket retaining compound is listed under tool if required.
Push bearing all the way thru to remove parts
Push bearing all the way to to remove oil seals and bearing parts
Push bearing all the way thru to remove parts
Press only half way if you are not replacing with new bearing.
Coat 3 oil seals with 680 loctite
Loctite must be applied to outside on three seals.
Cover inside bearing and seal area with 680 loctite
680 Loctite must be applied to inside of retainer
Install new bearing with the number up
Now you can install bearing 1st and seals after.
Will require one 22860 bearing OEM 379504
Will require one P/N 22860 bearing OEM 379504
Install first seal spring area down
Cover bearing, seals and o-ring area before painting with zinc chromate primer. Place 2 or 3 coats of clear lacquer over that to stop corrosion.
Install till flat
Install till flat
Install second oil seal with spring area up
Install second oil seal with spring area up
Two seals installed here
Two seals installed here
Line up and install third oil seal
Line up and install third oil seal and wipe off excess 680 Loctite compound
Insert oil seal till flat on top
Insert 3rd oil seal till flat on top.
Clean bearing and seals of any 680 Loctite. This is a used electric shift with rebuilt gear-head
Used electric shift with rebuilt gear head
Used electric shift with rebuilt gear head
Used electric shift with rebuilt gear head
P/N U-22-540 Used gear head assembly OEM 381849 with 3 seals in propeller shaft area. Bearing retainer has three seals located in different areas. This is so any groves that may be on the old prop shaft will not come in contact with the newly placed seals. Gear head assembly has zinc chromate primer with clear coat paint. $179.09
Shaft view electric shift 1971-1977
OMC sterndrive shaft view for electric shift years 1971-1977
Used electric shift with rebuilt gear head
This is a standard rebuilt used electric shift sterndrive from T.C.Electronics/Marine