I've had two freeze plugs blow out in about a week!

[Momz]

Over the winter I did a desmog and I used 14mm freeze plugs on the top side of the motor.

Last week sometime I blew out a 14mm freeze plug from the right front and today I blew out the left rear plug.    Both times I was accelerating hard when they blew out, and both times the motor was fairly hot. I will admit that I drove the plugs down so that they would be just below the casting on the block. They could have been driven down further but I thought that that would just be a place for water to collect.

My solution to this was to insert a button head allen screw (5/16ths) into the hole and use an allen wrench to allow the screw to thread itself into the casting and then fill the rest of the hole with JB Weld.

Presto!!!  A permanent fix, that's cheap and no hassles with trying to locate those pesky freeze plugs.

[Tropic traveler]

That's kinda strange. ???
I did a desmog about 30K miles ago using the cup plugs & have had zero problems. I did drive the plugs down to where there was a good 3/8" between the top of the plug & the top of the hole. No JB weld & just dressed the hole up with some chrome 9/16" "finger grip" caps.
Oh well, as long as you JB'ed the holes you will be good to go! 


 

[fudgie]

Noticed mine were loose till they got all the way down. I thought about water also but figured it would evap as the engine warmed up.

[dreamaker]

I did this a few years back and I never had a problem. This pic was originally just for show and replaced with SS plug. What I did is go to my local boat shop and bought 4 stainless steel ,if I recall correctly 3/8-16 short plugs. I tapped the tube end put a dot of sealer on the threads and tightened down and I was set.

Dan