Repairing Drilled Engine Block

[Husaberger]

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

 

[WranglerX]

If it's only into water jacket, I would venture to guess to tap threads into in and install a plug.... It's drilled all the way into a cylinder, it's pretty much dead.... IF drilled all the way into cylinder you "might" sleeve it but it would be rather ifie....

 

[Husaberger]

If it's only into water jacket, I would venture to guess to tap threads into in and install a plug.... It's drilled all the way into a cylinder, it's pretty much dead.... IF drilled all the way into cylinder you "might" sleeve it but it would be rather ifie....

What is the concern with sleeving if into the cylinder?

 

[ericm979]

If it's only into water jacket, I would venture to guess to tap threads into in and install a plug.... It's drilled all the way into a cylinder, it's pretty much dead.... IF drilled all the way into cylinder you "might" sleeve it but it would be rather ifie....

If it was drilled into a cylinder a sleeve would fix it unless the sleeves were the ones with seals on the ends to keep coolant out. Then you'd need to plug the hole. You could do that with epoxy if you can get tools in through the water jacket. Or cut a larger hole in the outside of the water jacket, weld up the hole and then welt the cut out part back in.

 

[WranglerX]

What is the concern with sleeving if into the cylinder?

Going to the expense of sleeving and it does not seal so you have water leaking into cylinder.....

 

[IndyIan]

No experience with this, but could you pull the sleeve for that cylinder, tap all the holes in the block, put in a set screw with the threads covered with epoxy in each hole in the block, then put in a new sleeve?

 

[ruffdog]

Rebuild kits for the V2403 engine show replaceable liners. Both holes through the casting would have to be tapped and plugged. The outside hole may have to be bigger to allow the tap to reach the inner hole. Use a high temp thread sealer.

 

[WinterDeere]

I have no experience with building small tractor engines, but having done several car engines, there's a lot of hours and dollars in involved in any engine build. I'd hate to put all that into an iffy block.

How much are you really saving by using this block, versus buying another core from a totaled tractor?

 

[Husaberger]

I have no experience with building small tractor engines, but having done several car engines, there's a lot of hours and dollars in involved in any engine build. I'd hate to put all that into an iffy block.

How much are you really saving by using this block, versus buying another core from a totaled tractor?

Good question

 

[4570Man]

Is that all they did to the block? It wasn’t uncommon to pour glass shards in the oil and run them until they seized. As for the hole it could be brazed over and a cylinder sleeve installed if needed.