'64 Evinrude 18 gear case seal question?

[antnida]

Hi, I am a newbie to the boating world, recently I got a used 14' aluminum with a '64 Evinrude 18 hp. The motor ran and idle fine, start with a few pull when cold. However, when the rev up all the way it maxed out at 10 mph with one small person on board. After reading a lot about use motor and what to look for I discovered that the lower unit is leaking in water. (I just got done rebuild the carb & change the spark plugs).

After a lot of works trying to remove the 6 screws so I can get access to all the seals I finally got the screws out. My question is does the screws when tighten will prevent water from coming through the thread since there are no washer (assuming a tight seal every where else)? I am planing to replace those screws with same size screws from a local hardware store since the head are no longer in good shape to be reuse.




I also read that 3M 847 sealant is recommended but the local marine shop didn't have any and sold me OEM Johson gasket sealant would that works, I also picked up a tube of Permatex gasket sealant not sure which of these 2 works better?


Thanks

 

[boobie]

Get something the same as the 3M847. Try a NAPA store.

 

[HighTrim]

I always use 3M 847. I am surprised they sold you gasket sealing compound. Torque them, and evenly as well. Cover all the bolt threads with sealant. Replace the spaghetti seal, and ensure it only overhangs about 1/16", and is square, not cut on an angle. Ensure that when you lower the skeg down, you don't buckle the spaghetti seal either. Run a bead of 847 around the prop shaft head o ring as well.

 

[F_R]

If you had used a hand impact screwdriver (the kind that rotates when you whack it with a hammer) it would have removed those screws in a flash. The same tool is reversible, and will install them tightly to help prevent leakage around the heads. Of course, proper sealant is also required.