Crankcase Head

[nabeel.alsalam]

I'm doing my first engine rebuild -- a 1991 Johnson 40 horse. I'm well along in the process of putting it back together. I'm at stage of attaching the crankcase head, but feel something may not be right.<br /><br />This crankcase head houses two seals: the lower crankshaft seal and one that must seal the driveshaft. This crankcase head bolts across a surface formed by the two halves of the crankcase. However, that surface is not perfectly smooth. There is a small edge between the two halves. A taper pin determines the alignment of the two halves and that is in. I'm suppose to apply a gasket sealer to the surface but will that deal with the edge? The lower main bearing is nearby so I believe this area is subject to compression and decompression as the engine runs. <br /><br />I'd appreciate any advice before proceeding further. Thanks.

 

[Walker]

Re: Crankcase Head

The top surface doesn't matter that much. Its the inner surface where the oring seals. The bottom cap needs to have the bolts sealed.

 

[nabeel.alsalam]

Re: Crankcase Head

That makes sense. Thanks.