blown out core plugs

tie_one_on

Petty Officer 1st Class
Joined
Oct 27, 2003
Messages
276
Can a core plug (freeze plug or what ever you want to call) be reused if it's pushed out due a frezze? If you can reuse them do you put them in dry, with silicone, with harding gasket sealer, non harding gasket sealer???? Thanks again.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,348
Re: blown out core plugs

you can ,if there undamaged. permatex avaition is what i use.
 

Norm Malcosky

Seaman
Joined
Aug 14, 2002
Messages
70
Re: blown out core plugs

Tie one on,<br /><br />The ice that pushed out the core plug may have also cracked your engine block. Before wasting much of your time on this engine, I would check to see if the block and heads are OK. <br /><br />First check the oil level in the engine to see if you see any water in the oil. But, a recently cracked block may not allow water to enter the crankcase - SO:<br /><br />1.) Put the original plugs back in the core holes with what ever glue you can find to hold them in place temporarily (permatex, silicone, or even construction adhesive). <br /><br />2.) Then hook up the stern drive/engine to the "muffs" i.e. garden hose and start the engine. Try to run it enough to warm it up to full operating temperature while checking for leaking water from block cracks, head cracks, or intake manifold cracks. If the only leaks are from the core plugs, so far so good.<br /><br />3.) Next, if the engine appears to be operating well, stop the engine and again check the oil level and quality. It may have changed color and appear to be creamy if it has water in it - or it may be poring out of the oil breather filler and look like hot peanut butter. <br /><br />4.) Assuming the engine is still viable, go to your marine dealer and purchase new "freeze plugs" and install them as per instruction using suitable permatex and a tap of a hammer in the center of the brass plug. <br /><br />5.) I you get this far and the engine is OK, you have dodged a major bullet. Next year drain and winterize the block before it freezes.<br /><br />Lots of luck with you project !!
 

tie_one_on

Petty Officer 1st Class
Joined
Oct 27, 2003
Messages
276
Re: blown out core plugs

Thanks for the replies. The core plug in question is at the back of the engine, between the engine and the velvet drive transmission. I'm hoping I could remove the transmission and if it is the core plug, simply reuse it with a non hardening gasket sealer, reinstall the transmission and hope there are no other cracks. I ran the engine already for about 15-20 minutes. The oil seems okay so far.<br /><br />What do you guys think? If it was only the core plug will I be okay for the long term by using the old plug (assuming there are no other cracks in the block)?
 

Norm Malcosky

Seaman
Joined
Aug 14, 2002
Messages
70
Re: blown out core plugs

Yes, you may get a few running hours by "reglueing" the old plug into the block. (It certainly would help you verify that the block is in good shape.) However, if the block is good - a permanent repair would be best and it might keep your boat from sinking. The temporary plug could come out at any time filling your bilge with mucho water, FAST !<br /><br />You may be able to find one of those expanding rubber core plugs. This type is available from many auto parts stores for a variety of hole diameters. You install them with a wrench by tightening a center bolt. The rubber expands and walla-la, hole is fixed. This would also be a temporary fix - probably good for a few months. <br /><br />You really need to get the proper brass core plug and install it correctly. Then you would be able to sleep better at night and not worry about the boat filling with water and heading for Davy Jones'es locker.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,103
Re: blown out core plugs

What do you guys think? If it was only the core plug will I be okay for the long term by using the old plug (assuming there are no other cracks in the block)?
Ayuh,.........<br /> If you find the Coreplug in Good Shape,+ Not bent or corroded,.....<br />Give it a coating of #2 Permagasket,+ Reinstall it...........<br />I wouldn't use Anything Stronger than #2 formagasket,.....<br />After All,... If something were to Happen Again,..... It's Got to be Able to walk Out of the Block again,... Or the block will Crack.......<br /><br />If the old plug is in Good Shape,.....................It'll be Fine........
 

tie_one_on

Petty Officer 1st Class
Joined
Oct 27, 2003
Messages
276
Re: blown out core plugs

Thanks again guys. Anyone know what size that plug is? I would rather put a new one in if I knew what size it is. But my boat is about an hour away from me, and I like to work on it this afternoon, I doubt if any boat shops will be open, but maybe Autozone or Advanced Auto Parts may have brass plugs.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,103
Re: blown out core plugs

but maybe Autozone or Advanced Auto Parts may have brass plugs.
Most Auto Parts Stores Should have a reasonable selection............<br />Or,... A Hot Rod Shop will have them......
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: blown out core plugs

"Any Anti-Freeze,.......Is Better,.... than No Anti-Freeze at all",.....<br />
Draining works and air don't freeze and break blocks, look at any OEM manual and the first step in draining the engine is to get the engine level so it will drain completely. <br />If you can't get it level, you can't drain it completely.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,103
Re: blown out core plugs

I'm Truly Sorry that Dry storage Didn't work for you...........<br /><br />But,... It's Not the Method that went Wrong,.... It Must have been your execution of it.......<br /><br />If it makes You Feel Better,...... I have No Problem with You Blaming Me............ :rolleyes:
 

tie_one_on

Petty Officer 1st Class
Joined
Oct 27, 2003
Messages
276
Re: blown out core plugs

Not blaming anyone but myself. Been using anti-freeze for over 10 years no problems. Used air one year, both engines froze. I'm hoping I'm lucky on the first one and only the core plug by the starter blew out. I put it back in and didn't see any external leaks. I'll have to watch the oil for a while just to make sure.<br />You can bet your bottom dollar I'll use AF next year and into the future.<br />I just hope I can save one person from trying the the air method. Like Rodbolt says 'he gets a few new pair of shoes evey year from the air method'.<br />Looks like short block build up time for me.
 

jspringator

Chief Petty Officer
Joined
May 27, 2006
Messages
415
Re: blown out core plugs

I have had two (2) freeze plugs blow out on me in the past 5 years. I winterize using a large plastic bucket filled with antifreeze, and a Y valve at the end. Attach the hose to one free end of the Y valve and the Muffs to the other. Adjust the valve to the muffs for 20 minutes or so until the temp guage stops rising. Then switch the valve so it takes antifreeze (idle speed only). Right as the antifreeze starts to run out I kill the engine with fogging oil. I always make sure that the engine is discharging antifreeze before I kill it. Why are the plugs popping out?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,103
Re: blown out core plugs

Because it's Freezing............<br /><br />tie_one_on used the Dry Storage Method,.......<br />
But,... It's Not the Method that went Wrong,.... It Must have been your execution of it.......
I'd say This applies to Your Method of Anti-Freeze Storage as Well................. :rolleyes:
 

wvit100

Chief Petty Officer
Joined
May 6, 2002
Messages
416
Re: blown out core plugs

I've always just drained the block and never had any problems. I always take the drain plugs out and put them in the cupholder until the next spring. Then run a wire up into the drains to make sure that no grit or leaves or such is blocking the holes. If there isn't any water in the block or power steering cooler what is there to freeze?
 

jspringator

Chief Petty Officer
Joined
May 27, 2006
Messages
415
Re: blown out core plugs

The last time I used the drain the block winterization method, the power steering pump cooler froze and burst. I think next year I will use undiluted antifreeze. Maybe a 100 watt bulb in the bilge? It could be that since I am not draining the block as designed, junk is building up in the block that impedes or prevents the antifreeze from seeping everywhere. I am going to drain the block, using a wire, just to clean it out. What do you think?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,103
Re: blown out core plugs

Gotta Pull the Big Hose off the circulating pump.........<br />And the Manifolds,.....<br />Put the Drive Down, or take it Off,.....<br />As well as the Block,+ P/S Cooler.........<br /><br />I leave a SSteel deckscrew laying on the Intake manifold,.... That's also where I store the petcocks during the Cold times........<br /><br />Around here,.... Winterizing Has to be done by October,......<br />I'm Still Fishing thru December,.......I sometimes Winterize 5 or 6 times a year..........
 
Top