Reply To: Anodes on Evinrude 18 hp 1960

[salnaes]

Thank you all for contribution to this discussion. I will follow Mumbles advice which seems to be confirmed by several of you. In addition I had a chat with a local mechanics here at my place yesterday who pointed out the fact that copper and aluminium is a bad combination. He strongly advice me not to use any sealer containing copper, since it will eat aluminium, as he said.

I have Permatex Form-A-Gasket Aviation 3 in my workshop, so I will use this on the threads on both the two main bearing center bolts and on the eight sidebolts. Since several of the sidebolts are unavailable for 1/2” socket mounted on my torque wrench, it will be impossible to torque those bolts to the torque specs, so I have to use only my own feeling with a regular wrench. I dont have a crow foot, and it’s not possible to obtain 3/8” – 1/2” in our European metric world.

On the crankcase flange I will use a thin layer of Loctite 518 anaerobic sealer. I will clean both flanges with aceton, and then use Loctite 7649 primer (spray can) on the flanges, let it air dry, and then apply a small bead on one of the flanges. I will avoid sealing the labyrinth grooves by the center bearing. I have tested the cover on the block, and it seems to fit perfectly without any gaps or movement. I might spread the sealer out on the flange surface with my finger. Some people put sealer on both flanges. I’m afraid of having to much sealer there, since it might squeeze inside the flange and possibly plug the labyrinth grooves and get into the crankcase where it shouldn’t be.

So I was thinking of just make a thin and even layer on one of the flanges. Finally the two tapered pins are installed through the cover. Correct me if I’m wrong, but the thin part of the pin goes down through the hole in the cover and further into the block, right? With the pins installed I seal the threads on the 10 bolts and fasten them in the same manner as fastening the cylinder head bolts. I torque down to spec for those bolts that’s possible to torque. The remaining bolts I torque with a regular wrench due to the problems I mentioned above.

Does this sound ok?