Dale, Most of this info was from Frank Robb’s great explanation in previous posts of this drainage setup.
From around 1950 thru 1967 the crankcase puddle drains led to a channel and passage in the front of the casting and were dumped into the exhaust housing and lake.
Starting 1968 part of the drainage system was eliminated, and what was left was routed through a hose to a fitting in lower bypass cover….actually one of the bypass cover bolts which was a combo bolt and fitting (part number 315230).
From there it went through the casting and into the exhaust area, where the heat was supposed to evaporate and “smoke off” some of the fuel & oil. The rest still went out the exhaust into the lake.
According to MarineEngine part diagrams this was done from 1968-1970 on 18, 20, 25 HP.
Starting in ’71 they re-routed the hose into a fitting in the upper bypass cover/bleed valve (part number 384972) so it would be drawn into the cylinder and burned. That caused mostly rich running in that cylinder and idling problems.
So yours is a little better system being a ’68-’70.
