3.0 block good or bad???

[Scarebird]

Earlier I was test running a 3.0 88 Mercurser after fixing a list of issues. After 10 minutes of running I was greeted by a gush of chocolate milk out the valve cover. Wonderful . I drained the oil/water mix, and plugged the outlet hose, and fitted an airchuck to the inlet hose, ran it up to 15-20 psi (water pump hose swelled up quite a bit). No internal hissing I could hear thru the oil fill

I cannot see how that much water got in the crankcase if the block is good. I know these manifolds have a tendency to leak- but that much water?

 

[Bondo]

Re: 3.0 block good or bad???

A Bad Manifold won't leak into the Oil when the motor is Running,......
Only at rest.....

Try your Test again with the Sparkplugs Out.........And Slowly rotate the motor......

 

[Scarebird]

Re: 3.0 block good or bad???

That would be nice if this was the issue - a cracked cylinder can be sleeved for a 100 a hole.