Hole in aluminum block - how to repair


Old 01-12-09, 08:40 AM
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Join Date: Jan 2009
Posts: 5
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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Old 01-12-09, 08:59 AM
michaeljp86's Avatar
Join Date: May 2005
Location: USA
Posts: 478
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.
Old 01-12-09, 07:07 PM
Speedwrench's Avatar
Join Date: Apr 2008
Location: Oklahoma
Posts: 1,698
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?
Old 01-12-09, 07:16 PM
30yearTech's Avatar
Join Date: Oct 2006
Location: Central Texas
Posts: 1,176
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...
Old 01-13-09, 03:46 AM
Join Date: Nov 2005
Location: North Carolina
Posts: 948
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.
Old 01-14-09, 12:03 AM
Join Date: Jun 2008
Location: GA
Posts: 150
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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