coolant issue on 12 v 92s

Probably the pins that hold the lower washers in place on the main bearing cap broke or wore away. This allowed the washers to spin and eventually fall out.
Thanks Jim

The largest number of cylinders of a single, V92 Series Detroit Diesel engine
is sixteen. There never was a production 24V-92 configured as a single engine. It is true that multiple V-92 engines could be ganged together by gearboxes, however Detroit Diesel Corp. never released that configuration.

The V71 Series did include a 24V-71 engine, consisting of two 12V-71 cylinder blocks coupled together in-line as in the case of the 16V-71, 12V-92 and 16V-92 engines.

bluesuit: As Jimbo1959 suggested, the two thrust bearing locating pins on the front and rear main bearing caps should be checked to determine if they are intact. If not, a thrust bearing (two, half-circle arcs of 180 degrees each comprising a complete bearing) at the front and rear of the crank would not be prevented from rotating with the crankshaft, and possibly could have worn away until they might have dropped into the oil pan. (I am assuming that your previous use of the term,"...washers...", referred to the half-circle arcs which comprise the thrust bearing.)

Before I suggest possible alternate causes, please have your mechanic check
the pins on each cap, and also confirm that the washers found are in fact the
half-circle arcs which are the thrust bearings.

Frank:

With a 12V-92, the entire block assembly should be replaced.
This consists of properly aligned front and rear blocks. MTU/Detroit Diesel
has replacement longblocks available on a assemble to-order basis, which include all internal parts, and cylinder head assemblies. This may be the best course of action.
Also, do a Google search for "Boats and Harbors", which is a
advertising site for the commercial marine industry.

What part of the block is damaged? Is it the saddle or the main brg cap? Pictures if possible would be nice
Thanks Jim

Is that a balancing grind on the crank throw or did something hit it? If collision, with something, scrap the crank.

Hi,

If it got that dent from striking something the shaft might be bent which might explain why it spat the thrusts out.

Yes, If that is a strike as it looks like it in the pic.
I have never seen a balancing grind in that area before but I am not the 92 crank expert. If it truly is a strike, in my opinion, not repairable, no matter what your machine shop may say. There are too many vibrations already going on in a DD 2-stroke. You don't want to go thru this again. Toast the crank.

Hi

When the main brg shells are out is there any signs of fretting on the back or a lot of wear on one side of the bearing surface?

If it were mine I would check the alignment of the block even if I was going to junk it just to see if I could find something definitive to blame for the thrust coming out.

I have seen an engine rebuilt without thrusts by its Owner, the clutch was always going out of adjustment and there was metal in the oil. By the time the fault was discovered the retainer slot for the thrust was badly worn. The Owner operator did not have the cash for a new block so we drilled and screwed the thrusts onto the block. Never heard any complaints or problems in the next 4 yrs I worked in that shop.

If by this you mean fwd or aft side not top or bottom you have a bent crank.

Wow. What an adventure.
I'm not sure where that (suppose) strike on the crank came from. Was there a previous failure then slapped back together? I would not think a flying bearing part could do that.

There is no reason for that to be a balance mark, you always add/remove metal from the counterweights when balancing a crank. In the pic, it looks like it was made by solid contact with hard parts. I have seen a broken pushrod do similar damage in a different engine, makes me wonder what these engines have been through prior to your ownership. I am with everyone else, I wouldn't reuse the crank.

I too would not use that crank, I would exchange it with recon from Detroit. As to the block, it should have those recesses at the rear main brg area. Those recesses are there to hold the upper thrust washers. But I see you have split the blocks apart. If those 2 blocks check out, you will need some special tools from DDA to assemble the blocks back together, very critical procedure for securing the blocks together. If your guy is unsure I wouldn't try it. BTW Detroit makes oversize thrust washers for blocks that have been machined.
Jim