sealant

[bfitz241]

I am going to attempt my first lower unit reseal on a Johnson Fd-19.

Curious as to the recommended sealer for the mating surfaces and threads.

Any recommendations appreciated

Thanks

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Mike M

[Steve Martin]

I use 3M 847.  Messy, but effective.

[aquasonic]

Permatex Ultra Black works.

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The Boat House

[labrador-guy]

bf there are lots of good sealants out there.  The last couple gear cases I had apart I used the ultra black that aquasonic recommended.   I like it, these new sealants are impressive!  To do a good job on a gear case  takes some attention to detail.  The shift rod seal is usually the culprit.  The case needs to be totally torn down to change that seal.  The seal under the water pump is not so easy to get out.  Remember to put some sealant on the screw heads when reassembling.  Those screws are on the grease side of the case edges where you put the sealant.   You should have the gear case separated from the power head.  If not turn the motor over on its rewind.  There are alignment pins in both brass bearing.  Those pins must be in the proper position for assembly to be correct.

dale.

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The Boat House

[bobw]

I’ve typically used the 3M847 but I tried the Permatex Ultra Black on my last reseal job.    After that job, I doubt I’ll ever use the 3M again – the Ultra Black is a lot easier to work with and provides an effective seal.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

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The Boat House

[crosbyman]

here is another one .. flows nice  doesn’t set up to quickly made for  machined surfaces and good enough for air planes specs!!

Permatex® Aviation Form-A-Gasket Sealant Liquid 3H, 118-mL | Canadian Tire

spagetti seal is available by the  foot and comes in diff. thickness ..If I remember the last one I use  on a 5.5 was   .103               a bit thicker  but it  worked out ok.  i’ll try to  measure and confirm

pressure/vacum  tested the GC 10 minutes .  Had trouble closing the GC with the  shock absorber and ended up welding it.

Joining AOMCI has priviledges 🙂

[The Boat House]

Thanks for the heads up on the Ultra Black.
I didn’t know.
.

[bfitz241]

thanks for the info.   The really good thing about those products is they’re easy to get.

One other question, I see that sierra sells a kit but haven’t seen where OMC does.  Are the sierra kits worth using or should I get OMC parts individually?

 

[aquasonic]

I have not seen an OMC/BRP seal kit before and not sure if they supply a kit. I have limited experience with the Sierra kits, but they are economical, come with everything needed, and seem to work fine.

Individual OMC parts would be more expensive, which should mean better quality, but I’m not sure in this case.

The spaghetti seal can be bought in bulk from Grainger, McMaster-Carr, or a similar supplier very economically. It is sold as “Buna-N Oil-Resistant Rubber Cord Stock”.

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bfitz241

[bfitz241]

so that’s .103″ seal cord from mcmaster or grainger

OMC seals might be better

as to the ultra black, just smear a thin amount on the halves and assemble it or is there a trick ?

I’m curious about sealing the screws now, put something on the threads or something under the screw heads?  Or both?   Same products as above mentioned?

 

Thanks for the help guys

 

[Author]

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