mercury 70hp 1989 hard knock after rebuild

[JT!]

I just rebuilt my 70 merc with new pistons, bearings, and a gasket set.

the engine previously had a bad top connecting rod big end bearing failure. once in 2006 and again in 2015.

after starting it up it knocked loudly and removing the carbs and reeds I was able to see the top bearing is very slack.

I'm going to measure the connecting rod, but I can see that the crankshaft's race is squishing out the sides



are there oversize bearing available?
can I use another crankshaft with a different part # from the same era 1987-1992 merc 70 ....


What are my options?

 

[Faztbullet]

No such thing as oversized bearings and likely needs a crank...yes you can use a different crank up to 1991. Be aware that around 1990 that firing order changed

 

[JT!]

from what I gather, I need crankshaft pn# 472-9001T

I figure NONE of the following will work:

"Mercury mariner force crankshaft 70 HP Force 1991 400-817527T3 400-817527A3 "
"1987-1993-Mercury-Mariner-Outboard-70-75-80-90-HP-Crankshaft-Assembly-3001A-3"
"Mercury 3 cly CrankShaft FA85018-2 70 75 85 90 hp 1984-1991 Outboard"
"Mercury Crankshaft 1972-1990 50 60 70 HP 3 Cyl 6642A2 7574A2 8839A2 4393A2" <--- this one has splines instead of a woodruff key.

 

[JT!]

can I use other part numbers other than 472-9001T3