Photos - Right Seal Kit?

[crackerjack]

My 1999 Alpha One Gen 2 recently developed a leak from the driveshaft seal where the vertical shaft from the lower unit plugs into the upper. I ordered the Mercruiser Quicksilver seal kit, spanner & 12 point 3/8” socket and started in, following steps in Mercruiser service manual #14.

But the driveshaft seal in my kit looks different than the one I removed: photo 1 (new on left, old on right in pieces)

The old seal had a lip that went down into the shaft with a ridge that fit into a groove. Of course it tore up during removal.
The new seal will be pressed in place but has no ridge to fit into the groove. Will it stay in place when the shaft is inserted?

Also, the manual shows two seals in that spot: photo 2 from service manual

My Quicksilver kit seems to only have one spring seal, number5 in photo 3
​​​​​​​
Should I just insert the one seal? Does it need gasket sealer to stay put? Am I missing something?
All answers are appreciated.

 

[Bt Doctur]

What is the serial number of the drive and how many seals did you remove 0M400411 and below 2 seals #66302 oM400411 and above 1 seal #864319

 

[Rick Stephens]

I seem to remember that when I replaced all the seals in my Gen2 the output shaft seal went from two separate seals to a larger single one.

 

[crackerjack]

Doctor, I removed one seal, but it’s a little different the the replacement I got. I’ve owned the boat for 16 yrs and don’t think the upper has been opened before so it was probably the original. Serial stamped in the leg looks like OL451022.

 

[Jcris]

I’m with Rick on this one,
did the same seal on my 96 last year. It was 2 separate seals and now is just one. Hasn’t leaked yet so seems good

 

[Bondo]

Ayuh,..... At 1st glance, I'd say ya got the wrong seal,...... But,.....

I've never been there,....... Give ya a bump to the top, anyways,......

 

[achris]

Originally there were 2 seals, back to back 26-66302's. Around 2002 Merc changed those 2 for a single double lip seal. And that's what is in all the new kits.

Not sure what you mean by 'a groove'. All the castings I have seen have only a smooth machined surface. There is a flange at the very bottom to stop the seal being pushed all the way through. I always put a thin smear of Loctite 515 Master gasket sealer on the outer edges of seals when I put them in. And don't forget to fill the cavity between the 2 lips with grease before you assembly the lower and upper together.

If you have a groove on the top of the drive shaft, it needs to be replaced.

Chris......

 

[PeterB26]

I’m with Rick on this one,
did the same seal on my 96 last year. It was 2 separate seals and now is just one. Hasn’t leaked yet so seems good

Originally there were 2 seals, back to back 26-66302's. Around 2002 Merc changed those 2 for a single double lip seal. And that's what is in all the new kits.

Not sure what you mean by 'a groove'. All the castings I have seen have only a smooth machined surface. There is a flange at the very bottom to stop the seal being pushed all the way through. I always put a thin smear of Loctite 515 Master gasket sealer on the outer edges of seals when I put them in. And don't forget to fill the cavity between the 2 lips with grease before you assembly the lower and upper together.

If you have a groove on the top of the drive shaft, it needs to be replaced.

Chris......

I'm about to tackle this same job and glad to have found this thread since I did not know about the single seal change. Is there a proper orientation to the single seal? i.e. rcorrect side to put up?
Thanks