FJ180 scored crankshaft and top bearing

[Cfs]

Here are some photos of the upper bearing surface on the crankshaft and the damaged cast aluminum bearing surface in the lid. As I think I previously mentioned I have not disconnected the blade clutch and transmission pulley or removed the engine in order to remove the crankshaft from the crankcase. I think I am correct in thinking that the upper bearing depends on oil being pumped up to the top of the engine for lubrication, while the lower bearing is immersed in oil due to the oil laying on top of it in the bottom of the crankcase

Not to confuse things but here are a few photos of an old crankshaft that I think is fro a Honda with the same type of damage to the crankshaft

 

[sgkent]

I was taught in machine work that the harder surface wears when combined with a softer surface when contamination is present. The expression was I think, "The softer material takes the charge and the harder material wears." People want to argue that all the time but think about it. Take a stick of butter out of the fridge, throw some glass shards, sand, woods splinters on it and press them into the butter. Rub it on something harder and see how much it scratches. The butter and contamination embedded in it don't wear much. The aluminum is soft enough that sand and debris is embedding in it. The contamination then wears the crankshaft.

 

[Auto Doc's]

That looks to be beyond saving, the seal groove and aluminum scoring tells me this thing was run low on oil. Here is a used long block engine I found on Ebay:

John Deere 14SB 14SE JX75 Kawasaki FC150V JS00 running long block engine | eBay

If I did make a mistake I will try to make it right.

www.ebay.com

 

[slomo]

Who put sand in the oil sump? You have more issues than one crank bearing surface.

Look at all that grit inside on the parts.......... WOW!!! That is a filthy engine.

 

[Cfs]

Thank ms to you all for your input. I was hoping that given the good condition of the piston & rings and the cylinder, I would be able to replace the broken rod and be back in business. Then I noticed the scoring on the crankshaft from and lid. I knew I should get input and advice looks like it’s destined to go to the recycling center

 

[StarTech]

If it was me I would stick a fork in it and call it done. New to the equipment engine is needed.