Post your questions or problems you are haviing with your Yanmar tractor here.
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I have the engine tore down (in frame). A broken piston was the reason for oil consumption. I have all parts ordered. Putting all new pistons, sleeves, rings, rod bearings. The crankshaft, I noticed when I cleaned it up, has slight wear marks where the rod bearings ride. Nothing that catches a finger nail, really you can just tell where the rod bearings rode for years. Should I run some fine Emery cloth around the journals to polish them back up? Or could that cause problems. Also there are a few fine peices of "glitter" on the inside of the block walls from where the rings failed on one piston. What's the best way to clean all that out while still in frame with crank still in? Spray the inside of the block walls with brake parts cleaner and just let it run out? Also spotted what appears to be a small hair like crack on the inside of the block on the wall casting. It does not go through to the out side. It's so fine it doesn't like it penetrates the wall at all, looks to be just a surface crack. Should I just JB weld over the crack or anything while I'm in there? Or just leave it alone? I don't think it would ever cause any problems but I'm no expert.
Last edited by Hnewman144 on Wed Feb 14, 2018 10:56 am, edited 1 time in total.
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Aren't the "block walls" you mention the soon-to-be-replaced sleeves? Also, unless there is foreign, (bearing) material on the crank journals don't remove any material unless you plan to grind and install oversize bearings.
Great thanks. And no the crack is actually down in the crank case. It's on the side of the block..but on the insde, not the outside. It appears to be a surface crack on the rough surface maybe from the the sand casting mold they used to cast the block. Like I said it doesn't got through to the other side because if it did it would leak oil out of it sense it's in the crank case area.
I took a better look at it this evening. It's not scuffed, it's just that the edges of the journal were stained from sludgey oil and where the bearings ride were shiney and clean. Cleaned with parts cleaner and no scratches or marks at all. Although I'm still wondering about the hair line crack in the casting. Debating on jb welding it or just leaving it alone. No telling how long it's been like that. I think it's just an imperfection in the casting. I tried attaching a photo.
- Hair line crack
- Collage 2018-02-14 20_45_45.jpg (153.24 KiB) Viewed 749 times
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