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Hole in aluminum block - how to repair

hayseed1's Avatar

Join Date: Jan 2009
Posts: 5

01-12-09, 08:40 AM   #1  
Hole in aluminum block - how to repair

i have a 10hp briggs aluminum block motor that has a hole the size of a marble from a thrown rod.. can i use an epoxy to cover the hole ? there is no stress just heat..
i also have some aluminum rod that i picked up somewhere that you heat up and "weld"/melt onto the broken surface -- i was thinking i could either epoxy a small patch over the hole or solder/weld a small piece of aluminum over the hole -- anyone done anything like this before? suggestion welcome -- thanks

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michaeljp86's Avatar

Join Date: May 2005
Posts: 478

01-12-09, 08:59 AM   #2  
If there is room behind teh hole I would cut a small piece of metal and use some high temp silicone and use 4 pop rivets and just patch over it.

You could take it to a welding shop or try some of that aluminum brazing rod. I tried the brazing rob but never could get it to work right.

I would do the patch like I said at the top. I have 15 lawn mowers and do all sorts of stuff like that with no problems. I even did it on a 50hp diesel tractor engine. If you do the patch you could always put a pipe fitting on there for your oil return when you put a turbo on it.

Speedwrench's Avatar

Join Date: Apr 2008
Posts: 1,698

01-12-09, 07:07 PM   #3  
if you get the metal very clean with mild acid the epoxy will give you good service.

how come common sense isn't so common?

30yearTech's Avatar

Join Date: Oct 2006
Posts: 1,176

01-12-09, 07:16 PM   #4  
I like "JB Weld" for this type of repair. If have had pretty good sucess patching otherwise good engine blocks and had them work for years with no related issues to the patch.

Best of Luck...

flopshot's Avatar

Join Date: Nov 2005
Posts: 948

01-13-09, 03:46 AM   #5  
if there's room inside the block you could run a bolt and nut through it with washers on both sides and epoxy over it. should seal well enough. a 1/4" bolt would do it.

rogerflies's Avatar

Join Date: Jun 2008
Posts: 150

01-14-09, 12:03 AM   #6  
Get a carriage bolt, and put the head on the inside. You may have to file the corners off the square shank to fit the hole. Cut a rubber gasket or use sealer under the head. Put a washer and nut on the outside.


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