Should I Worry About My Block Being Cracked???!!

Alpheus

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Aug 3, 2009
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1,759
Re: Should I Worry About My Block Being Cracked???!!

That shorter core plug will work just fine, coat the outer surface with the brush-on Permatex, then drive it in straight. Install it so the outer edge is flush with the block.
 

HT32BSX115

Supreme Mariner
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Dec 8, 2005
Messages
10,083
Re: Should I Worry About My Block Being Cracked???!!

is there a certain tool i need to pressure test it
?


Did you not read my second post? I indicated in my second post where to find the excellent instructions on how to do it....


Those "plugs" should NEVER "pop" out.

If you want to pressure check your engine, Have a look Here.
So, HAVE A LOOK HERE <---------------click------------
 

bruceb58

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Mar 5, 2006
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30,581
Re: Should I Worry About My Block Being Cracked???!!

ok i have the right size freeze plug and i can tell my old one is bent a little but the new one i got from napa is about an1/8 inch shorter on the walls of it. Is that ok r should i get one from mercury r maybe from my chevy dealer since it is a chevy block?
Did you buy a brass one?
 

snoop03

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Jul 13, 2008
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Re: Should I Worry About My Block Being Cracked???!!

yes i have a brass one. just need to install it and cross my fingers nothing is cracked. i do remember now that when i put the plug back in i ran it a good 15 minutes to get that oil real hot to change it and there was no water in it but well see i guess.
 

snoop03

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Jul 13, 2008
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Re: Should I Worry About My Block Being Cracked???!!

the instructions on pressure testing? It just says to plug off all hoses and put 15 ibs of pressure? What do i need to do that do i need to rent something to do this and if so where i hook it to the block at?
 

Bondo

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Re: Should I Worry About My Block Being Cracked???!!

What do i need to do that do i need to rent something to do this and if so where i hook it to the block at?

Ayuh,... We don't know what you've got for tools,+ resourses,....
Basically,...
Block off the cooling jacket of the block, with Whatever means you can come up with...
Plumb air into it with Whatever resourses you can find... Plumbing fittings, a pressure gauge, etc...
Then Test...

Or, as I said earlier,... Go run the snot out of it,+ keep watch on the Oil Level,+ Color...
 

Utahboatnut

Senior Chief Petty Officer
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Jan 15, 2009
Messages
785
Re: Should I Worry About My Block Being Cracked???!!

I had a core plug (PO used a steel one) rust thru while boating once a long time back and it was amazing how much/quiclky the bilge filled with water. When you install the new one take your time and it should be fine. Keep your eye on it the first trip out once you have run it for a bit under load and really raised the block temps. If you don't feel 100% on the pressure test do as Bondo advised take it out run it hard and check oil level/color often, also check new core plug at same time. Might want to pick up one of the rubber ones just to have on hand in case one of the others is loosened. They work well in a pinch and are pretty easy to install out on the lake if needed. Good luck hope all is well.
 

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Re: Should I Worry About My Block Being Cracked???!!

the instructions on pressure testing? It just says to plug off all hoses and put 15 ibs of pressure? What do i need to do that do i need to rent something to do this and if so where i hook it to the block at?


If you have the time and the lake is nearby, I would do it as Bondo suggests......splash the boat and run the snot out of it.....watch the oil closely.....

Otherwise,




It's a fairly easy job......You'll remove the hoses that feed the manifolds since you really cannot easily cap those.

Then plug the hose from the transom. Basically the water comes from the transom connection (raw water pump discharge) and goes to the engine (usually the t-stat housing) ............

Water FROM the engine (t-stat housing) goes to each (and thru each) exhaust manifold and riser, and then out with the exhaust.




You have to "cap" the hoses that supply each manifold and the single hose from the transom.

Connect your compressor, bicycle pump etc, can of R-134 refrigerant etc.......AND connect a gage to any of them using what ever "junk-box" or "HomeDepot" plumbing nightmare you can assemble......Any sort of pipe will work, galvanized, black pipe, plastic, etc..... 15 PSI is more than enough. Ensure that the compressor (if used) is off and it's otherwise quiet and listen!


If you're lucky, you won't hear anything........(unless your plumbing nightmare is leaking!)

If you're not very lucky, and you do hear leaks internally, then your block was more than half full and you may have internal cracks. Pull the intake manifold to inspect.


Regards,



Rick
 
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