I have a small pin sized hole in the back of my block. i believe its from an error in the casting, and when it was hot tanked it made it come out....

a builder around here told me that jb weld wont hold on a block bc it will heat up and expand causing the jb weld to crack off...

 

I've seen JB Weld hold well enough on a block, however I'd use some of that aluminum epoxy instead.

 

My personal preference would be to drain the radiator, clean the surface thoroughly with acetone, roughen the surface with an abrasive if you can get at it, clean again with acetone, pull a slight vacuum on the cooling system to get the epoxy to flow a little into the porosity and use Devcon aluminum filled industrial epoxie #10610, in particular:

http://www.devcon.com/devconfa...id=15

 

buddy of mine used JB weld.... it worked for a little bit of time, then he had to do it over and over and over again

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b18bEG &raquo;</TD></TR><TR><TD CLASS="quote">buddy of mine used JB weld.... it worked for a little bit of time, then he had to do it over and over and over again</TD></TR></TABLE>

how bad was his crack/hole?

 

Just don't use JB weld. It will more then likely give you problems down the road.

 

jb weld don't hold on a motor, will give u more problems then solutions.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by feri0 &raquo;</TD></TR><TR><TD CLASS="quote">how bad was his crack/hole?</TD></TR></TABLE>
it was small at first, then it got progressively bigger

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sack Master &raquo;</TD></TR><TR><TD CLASS="quote">Just don't use JB weld. It will more then likely give you problems down the road.</TD></TR></TABLE>

what is ur advise? aluminum epoxy?

 

you will have to go over it and over and over.... it will hold but keep breakin off..

mike

 

i say do it right, get it welded closed

just find a Awning shop or some company that has a MIG aluminum welding machine and just spot weld it closed. If you spot weld it and let it cool inbetween blasts of heat you will have absolutely no problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dirtyd463 &raquo;</TD></TR><TR><TD CLASS="quote">i say do it right, get it welded closed

just find a Awning shop or some company that has a MIG aluminum welding machine and just spot weld it closed. If you spot weld it and let it cool inbetween blasts of heat you will have absolutely no problems.</TD></TR></TABLE>


exaclty what i was going to say.

 

Weld it...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BigMoose &raquo;</TD></TR><TR><TD CLASS="quote">My personal preference would be to drain the radiator, clean the surface thoroughly with acetone, roughen the surface with an abrasive if you can get at it, clean again with acetone, pull a slight vacuum on the cooling system to get the epoxy to flow a little into the porosity and use Devcon aluminum filled industrial epoxie #10610, in particular:

http://www.devcon.com/devconfa...id=15</TD></TR></TABLE>

listen to this guy

 

i think im gonna drill it, tap it, then put a screw in it... i called around to the local builders and they all said the smae thing and that theyve had to do it several times and it works fine

 

you had better flush the block out after driling on it

 

Same principal as fixing cracks in heads and blocks i have done both, most recently a chevy 350, i recomend you do it with the block out of the car and dissassembled, so you don't accidently **** up and drill all the way through to your sleeve that wouldn't be cool. just my .02cents though

edit: also for added protection you can accually weld it your choice though

 

and welding would not require you to remove the engine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dirtyd463 &raquo;</TD></TR><TR><TD CLASS="quote">and welding would not require you to remove the engine </TD></TR></TABLE>

To do it correctly you remove the engine regardless