Spagetti seal help OMC

[rmhxruss]

Need the length of two seals for old Evinrude and Johnson motors. 302513 and 302604 these part numbers are no longer listed in the BRP price book but are listed in old OMC price books. The old books say to cut from roll 309044 but no length is specified. 302513 is from a 1961 18 HP and 302604 is from a 1961 40 HP. Newer 25 HP seal length is 12-7/8. 40 HP length 16-1/8. Could these be right.

[chinewalker]

Every kit I’ve ever bought that contained one had the seal about 2-4 inches too long, so I trimmed to fit. No idea what the exact length is. You could lay a string in the groove, mark the ends and measure it…

[frankr]

Proper installation involves sticking the seal in the groove and trimming it squarely to length. Whatever it takes is what it takes. Any listed lengths are approximate (excess) for reference only.

[outbdnut2]

I sometimes add non-hardening gasket sealer to those seals. The black stuff sold for automotive use that is gas and oil resistant works good. It’s messy and excess will squeeze out the seam when you assemble, requiring cleanup, but it insures a good seal. Do not use any silicone-based gasket sealer, as it can make things terrible to take apart next time.
Dave

[1946zephyr]

If it’s hard to take apart, then sealer was doing the right job. Properly sealed parts never come apart easily or are easily cleaned up

As far as the spaghetti seal, one seal is designed to fit all. Just trim to the proper length.
Make sure you seal good around the screw holes. The spaghetti seal does absolutely nothing to keep water out around the screw holes. This is actually kind of an oxymoron set up, on the split case lower units. Whoe puts the screw holes inside of the spaghetti seal perimeter?? Only OMC. 😀 😀 😀
They are good lower units though, when properly sealed.

[frankr]

quote 1946Zephyr:

If it’s hard to take apart, then sealer was doing the right job. Properly sealed parts never come apart easily or are easily cleaned up

As far as the spaghetti seal, one seal is designed to fit all. Just trim to the proper length.
Make sure you seal good around the screw holes. The spaghetti seal does absolutely nothing to keep water out around the screw holes. This is actually kind of an oxymoron set up, on the split case lower units. Whoe puts the screw holes inside of the spaghetti seal perimeter?? Only OMC. 😀 😀 😀
They are good lower units though, when properly sealed.

That’s one good reason why you should take your hand impact screwdriver and give the screws a whack or two to install them super tight (and jam-seal the washer-head screws tightly against the aluminum skeg material…a metal to metal seal). Also why the screws are so hard to get out the first time. Of course once Joe Shadetree works on it and leaves them relatively loose, expect leakage.

[Mumbles]

And put a bit of your favorite sealer on the inside of the screw holes before assembling.

3/32 Buna-N O ring material can be bought by the foot locally. It can also be bought in 100′ rolls online.

http://catalog.precisionassoc.com/item/ … -001-nbr70

http://www.theoringstore.com/index.php? … &cPath=117

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[1946zephyr]

That lower unit looks like it’s full of mud. LOL

[Mumbles]

quote 1946Zephyr:

That lower unit looks like it’s full of mud. LOL

Here’s looking inside the powerhead from the same ’58 Big Twin.

Rust never sleeps, it creaps everywhere!

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[1946zephyr]

Well, shucks. I’ve picked up a few in that state, over the years. It’s a shame to find them like that.

[Author]

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