Questions After Finishing 110 HP Teardown

[Shakedownscott]

I just finished tearing down a 1989 110Hp crossflow. When I pulled the crank out of the block I found this under the center bearing.



Not really sure what I am looking at here. Maybe the brass piece was a plug for the hole that got pushed into the crankcase? The hole is drilled down to the brass orifice plug that is still in the block. I am thinking the orifice is for lubing the bearing.

Another observation was that the thermostat and relief valve and spring have been completely removed by the previous owner. What affect would this have on the motor?

I am trying to figure out why this engine overheated, would either of these have contributed?

 

[emdsapmgr]

Re: Questions After Finishing 110 HP Teardown

Hard to tell what the brass pc is. It's sizeable. Most of the carb inner parts are brass. (butterflys and butterfly shafts) Maybe something got ingested from one of them. Possible the shape is not the same, if it got batted around internally. Good thing you found it and can remove it. Running without thermostats is usually an attempt to resolve some other (overheat) problem. Running without them causes the engine to run cool at idle. Also may not provide for even cooling throughout the block. (Always possible the water will exit the block before the cooling water gets to the top of the block.) A cool running block will accumulate more carbon internally over time than a warmer running block. That's not good-long term. Also, may not have the same combustion efficiency as a warmer block. Best to run with two new stats. Make sure when you are in the thermostat housing to check the two nylon pressure relief valves-they should not be heat-deformed.

 

[Shakedownscott]

Re: Questions After Finishing 110 HP Teardown

Everything was missing from the thermostat housing including the pressure relief valves and springs.

Should there be a hole in the block here?