Superseded gasket different from original

[Steve D]

I know it’s normal for superseded parts to be slightly different than the previous version but this seems unusual.

I’m working on a 1960 Evinrude 18 HP and replacing the Manifold to Leaf Plate gasket, #33 in the diagram, part 0304779 replaced by 0315991. You can see the original and the new superseded gasket are different. Do I have to specifically look for and order the original 0304779 number for this motor? Has anyone come across this before?

img upload

image upload no limit

how do i print screen

capture screen

photo hosting

[dan-in-tn]

I just finished a 1968 20hp Johnson. FD-22M. I used a #315991 & everything worked fine, but I don’t remember the gasket looking this way. I would not have put it on with a big hole where that one seems to be. The two pics ME shows are the same so I’m not sure what is going on here, but my new version of the gasket worked fine. I bought several of them.

Dan in TN

[Steve D]

Thanks Dan, I’m not sure either. What makes it more confusing is the diagram does show #33 with a small hole in the gasket to correspond with the hole in the reed plate, but the original gasket that came off the motor doesn’t have any hole there.

[collectorinspector]

The original gasket looks good to go.

If in doubt re-use it.

front plate for fixing the carb should have no corresponding passage or hole at that place anyway.

Yes?

If not what is a hole in paper but a red herring.

I would like to know what happens aye?

B

[fleetwin]

I’m not seeing the hole (or lack of one) that you are referring to, just the oblong hole that seems to be out of place slightly on the new gasket.

[collectorinspector]

quote fleetwin:

I’m not seeing the hole (or lack of one) that you are referring to, just the oblong hole that seems to be out of place slightly on the new gasket.

You are kidding me correct?

Is there a hole in the outer plate?

I try to type in English but maybe Australian English is a task.

I am learning still obviously.

Send pics of outer cover aye?

No one can tell by pics on a part list……………….it does not work. It is called copy and paste between years…………….OK?

B

[Steve D]

I understand that parts lists aren’t always accurate. But for the sake of explanation these are the holes I’m referring to in the diagram.

upload a gif
I also have a 1962 Evinrude 18 HP parts motor here so I took off that manifold and found the same thing…no hole in the gasket in that area. So the only conclusion I can come to is maybe that diagram is wrong. The original gasket on 2 motors I looked at does not have that hole. And the replacement gasket has an even larger hole that doesn’t match up exactly. I might just try cleaning the original one the best I can and re-use it with a thin coat of Permatex non-hardening and see what happens.

image ru

image ru

[chinewalker]

I think what you’re running into is best described as vestigial holes and cutouts. The new gasket has a hole there because newer 18s, 20s, and 25s of the 22-cube series had a bleeder hose that fed off a nub on the intake manifold. It ran around to the side to a nub on one of the port covers. If your earlier motor doesn’t have the nub on the intake cover then the hole in the gasket and reed plate lead nowhere and there is no issue.

[Steve D]

Hmmm, very interesting, thanks a lot for that Scott! I’ll just go ahead and use that new gasket then.

(By the way, I hope the 9.5 block is going to work out for you. If not, let me know…sdpiazza at aol)

[dan-in-tn]

I believe Scott has nailed it! The 1968 20hp was late enough to have the port so that’s why I didn’t notice the difference.

BTW: OMC didn’t need any obvious reason to change part numbers. It could be anything from color of the part to material change to just wanting to change the price! They got really bad about it towards the end. You may notice that in the beginning some numbers are the same for 75 yrs. At the end, part numbers were rarely good for a year. Made keeping up with things a nightmare.

Dan in TN

[Author]

Posts