Two questions about OMC Seals

[drifter]

I’m stumped by a seal. The seal in question fits in the bearing housing (below the water pump) of a mid 50’s OMC 5.5 or 7.5.
I’m scrounging parts from my shelves to cobble together a complete outboard, so this particular housing could be from any one of a bunch of motors.
The seals I have are 0300599 (replaced by 0327031, 18-2035), but they are too small. My housing measures about .937" O.D. and the seals mentioned are .875" O.D.
So, can someone please tell me the correct P/N for the seal I need (.937" O.D.)?

My second question concerns the shift rod O-ring (0301877). Is there a common Burna-N type O-ring that replaces 0301877?

Thank you for the help.

[frankr]

Are you sure you aren’t looking at a 9.5hp bearing housing? Bigger shaft/bearing and seal.

[drifter]

Hi Frank.
I’m 99% sure as I have never parted a 9.5. The drive shaft I’m using is from a 1956 Evinrude 7.5 (model 7520) and that drive shaft fits the housing I have.
Got me stumped.
Nick

[fisherman6]

I’m pretty sure there is not a common ‘standard’ o-ring usable as a shift rod seal on these motors. I would stick with the OMC part for this. I have even heard the Sierra ones aren’t quite right and often leak. I have no experience with them myself though. Someone with more experience re sealing these gearcases may be able to chime in on this one.
-Ben

OldJohnnyRude on YouTube

[drifter]

Thanks Ben. I’m thinking the same thing and I’ll go with the OMC part for this O-ring.

[frankr]

OK, I think I have it figured out. I believe the original 376075 bearing housing has been replaced with the superseded one, part number 382796. Seal for the 382796 housing is 314167. These parts appeared on the 6hp in the 1970’s

[drifter]

By golly Frank, I think you nailed it!
Thank you very much for your help.
(this is what I get for cobbling together an outboard from my parts bin)

[Mumbles]

Your small 327031 seal fits the three horse JW and Lightwin series driveshafts and also the early 5.5 and 7.5 horse motor driveshafts and your motor originally used a 303345 seal on the prop shaft. By early I mean anything before 1969 or so. I think it was mid ’68 they changed the seals and housings. The later motors use 314167 on the driveshaft and 313282 on the prop shaft. Since the bearing carriers on the prop shaft and under the water pump will interchange right up thru ’79, your motor has probably had some parts from a six horse swapped into it.

[drifter]

There is just no better site in the world than AOMCI!
I’ve been doing this a fairly long time (18 motors and counting) and yet, seems like everyday, I learn something new.
Might someone have the dimensions of the seal 314167?
As close as I can measure my housing and driveshaft with my primitive tools I get, drive shaft at 0.437" and seal OD at 0.937".
Will 314167 match to this seal?
Thank you all again for you great help.
Nick

[frankr]

Those measurements are probably close enough. They equate to nominal 7/16 and 15/16.

[Author]

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