Aussie 47 mercury

[GEOFFNZ]

In my experience I think the insert rod bearings used in the C69A engine were thicker than the 8BA insert bearings and the inside diameter of the C69A rod was greater. C69A insert shells and 8BA insert shells were not inter changeable.Repco made replacement C69A shells but hard to find now.Best way is to use 8BA rods and bearings. Someone else might shed some light on this. Cheers

[DanS]

Thanks Geoff, I will get these engines apart and see what I've got. One other funny thing, I spent weeks soaking, heating and slowly got head studs out of one. Unfortunately broke 4. Still figuring out how to get them out!
The other 69a every head stud just undid with the nuts! Just wondering if this is a concern? When about halfway out some studs felt loose, even a bit wobbly.

[GEOFFNZ]

Possibly someone has run a UNC tap into the block.The original threads were slightly under size to form a tight fit on the stud. Cheers

[DanS]

Gday guys, had a break and now back on to it.
Problem, the C69A we were looking to rebuild for the merc was looking
good! Standard bore, all studs out, no visible crack as yet! One night dad had a mate over wuth the oxy and cut through the seised up valves and with his valve removing tool and just not thinking he punched through a water jack hole!
Is this a dead block now or is there a way to fix it??
Thanks for any advice
Dan.

[38 coupe]

Originally Posted by DanS

Gday guys, had a break and now back on to it.
Problem, the C69A we were looking to rebuild for the merc was looking
good! Standard bore, all studs out, no visible crack as yet! One night dad had a mate over wuth the oxy and cut through the seised up valves and with his valve removing tool and just not thinking he punched through a water jack hole!
Is this a dead block now or is there a way to fix it??
Thanks for any advice
Dan.

Maybe you could drill the area round and use one of the cast iron crack repair plugs. Then drill one side of the repair plug for the water passage. You'd have to be careful that the plug doesn't bottom out before the threads get tight. Just an idea.