Repairing Drilled Engine Block

[DarkBlack]

Oh no... now you've started a whole "tape vs dope" debate, that'll take us through the next 3 pages.

…says the guy who posts every 5 minutes

 

[onetonford]

They might have picked that location because it has a oil passage thru there. If so no good to be repaired. Personally, I would not waste My time on it.

 

[manzer7]

I had the dealer install a new engine in my Kubota L4740 when it spun a bearing

In order to get the new engine from Kubota, they required the dealer to drill the block

Now I would like to rebuild this engine and am wondering what it would take to repair the drill hole

See pics

I would use J B Weld ! I've had good experience with it on my 1946 Willys CJ-2A Jeep repairing the front Head Bolt that got stripped. It comes out like cast iron ! If it is drilled right into the whole block - I would try it even inside the bore hole. If it doesn't pan out and provide the same finish in the cylinder then I would junk it.
THAT is my opinion of what I would do. Try it out ! Have fun at it . . . . . . .

 

[GeneSimm7]

Why did they want the dealer to drill the hole into the block?

 

[Page2]

Jeesh, why bother? You have a spun bearing, AND now a hole in the block! The bearing itself would be expensive to fix, and sleeving an engine is not cheap either. ---- Unless you are doing it yourself just to see if you can, then tear it apart and have fun!

 

[Gord Baker]

What is the concern with sleeving if into the cylinder?

 

[MRTOES]

Question....if the hole goes through to cylinder wall is it below the ring travel? If so thread the entire hole and insert threaded rod with sealer....otherwise junk it...
I personally would not buy a Kubota, no offense to anyone but they work too hard to do things like this. As another dealer at one time I saw too many small Kubota owners coming to me with tractors that ran hot with scalded piston walls and no sleeves....

 

[1Mech]

Looking into cost of sleeving it

How far down, from the top, is the hole drilled? If it is like halfway down, outside of the combustion chamber and below ring travel, why not just JB Weld it and give it a good honing, as long as nothing passes over it other than the piston skirt?

 

[1Mech]

So, once you spend the money to fix the "destroyed" engine, what do you plan to do with it, keep it as a spare or sell it?

 

[DarkBlack]

Jeesh, why bother? You have a spun bearing, AND now a hole in the block! The bearing itself would be expensive to fix, and sleeving an engine is not cheap either. ---- Unless you are doing it yourself just to see if you can, then tear it apart and have fun!

I’m still waiting to hear what bearing spun that deemed it more economical to replace the whole engine. Main, rod, or cam? Just one bearing? There’s got to be associated damage resulting from, and causing the spun bearing. Over reved, no oil pressure?