Does anyone know the answer?

[calndrmn]

I have a perfect Saturday to work on my project but I need just a little help.

I am putting my 1982 40 hp back together after a broken crank shaft. I marked everything during disassembly except the position of the lube holes on the bearings in relation to where they line up in the crankcase and block. The top bearing has two holes, opposite each other. There is a stud in the block and an open hole in the crankcase. I am assuming the the lube hole in the top bearing lines up with the open hole in the crankcase. Correct? The split sleeve on the center bearing has three holes, one larger one almost in the center and two smaller holes about a half inch on either side of the larger hole and each closer to opposite edges. Does this larger hole match the stud on the block? There are no holes in the "saddle" of the crankcase like there is for the top bearing. These are dumb questions, I know. My shop manual shows the holes but makes no mention of what to line them up with and I don't want to screw this up. Any other pointers on closing up the block/crankcase? Thanks to all who have been down this path before me and can offer some advice.

 

[Scaaty]

Re: Does anyone know the answer?

I have a perfect Saturday to work on my project but I need just a little help.

I am putting my 1982 40 hp back together after a broken crank shaft. I marked everything during disassembly except the position of the lube holes on the bearings in relation to where they line up in the crankcase and block. The top bearing has two holes, opposite each other. There is a stud in the block and an open hole in the crankcase. I am assuming the the lube hole in the top bearing lines up with the open hole in the crankcase. Correct? The split sleeve on the center bearing has three holes, one larger one almost in the center and two smaller holes about a half inch on either side of the larger hole and each closer to opposite edges. Does this larger hole match the stud on the block? There are no holes in the "saddle" of the crankcase like there is for the top bearing. These are dumb questions, I know. My shop manual shows the holes but makes no mention of what to line them up with and I don't want to screw this up. Any other pointers on closing up the block/crankcase? Thanks to all who have been down this path before me and can offer some advice.

I don't know for sure, but I can take a shot at it from being a Machinist. If any 2 surfaces are flat with no grooves, I would line up. Gootta kind figure when you look at it to see just where the oil has to get to. Any bearing that has a groove where the oil is heading, it will follow the groove and then out any other hole, but thats pressure feed.
Pix here would help..

 

[Joe Reeves]

Re: Does anyone know the answer?

There is a locating pin (dowel) for the top main bearing and also the center main bearing on that model.

The bearings will lock in ONLY when the bearing is in the proper position, there is no other way it will lock in.

If there is no locking pin (dowel) for the center main bearing (sleeve), it is because someone did not have it aligned properly and tightened the crankcase bolts down which would cause the crankshaft/center bearing to press that pin in flush. The cure is to pull that pin out and install a new one.

The center main bearing sleeve will also lock in only one way. One does not have to decide which hole it goes in.

 

[calndrmn]

Re: Does anyone know the answer?

Thanks for replying Joe - guys like you are what makes this forum work as well as it does and informative as it is!