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| Author |
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Ernie
| | Posted on Saturday, October 26, 2002 - 02:54 pm: | 
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On an engine with a removable head I have a couple of different ways of repairing the water passeges that have become to large to hold a headgasket. On an engine with small holes 1/4 in or so I drill and tap to a larger size pipe plug. I then install a pipe plug with epoxy and drill the center to the origional size. I then finally machine the gasket surface flat. This procedure also works good for long passages. Install plugs so they overlap each other and drill a hole in the end plug then use an end mill to cut the new slot. All the above is done in my milling machine. I use the same procedure on either the block or head.
On a larger engie with holes in the area of 1/2 in I drill 5/8th in and then countersink the hole. This gives a shiny clean surface for epoxy. I then insert a piece of 1/2 in copper tubing and surrond it with epoxy.
There are 3 pics below. The first one is copper tubing with epoxy unfinished. The next one is copper tubing with epoxy finished off. This case I want the copper tupe to pass through the gasket for strength so I have not filed the tube flat with the gasket surface. The 3rd pic is a flat gasket surface now repaired so it will hold a gasket.
This procedure I usually do with a hand drill or just a drill press.
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peter ogborne
| | Posted on Monday, November 04, 2002 - 08:16 am: |
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Good one Ernie .........I will keep this repair in mind . |
Jim
| | Posted on Monday, February 03, 2003 - 04:51 pm: |
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Hey, Ernie. Is there a brand of epoxy that you would recommend? Is that the same epoxy that you used on the ZR1 head? Would you recommend using that same epoxy on the block (crank case) to repair a crack? (old engine - want to try repair first) Thanks for the help. Jim |
Ernie
| | Posted on Monday, February 03, 2003 - 07:28 pm: |
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Jim,
I use JB Weld. I have used it for over 30 years. I dont' think there is a better "cold-weld" out there. Additionally it is good for around 600 deg (f). I have never had a failure no matter where I have used it. My 14hp John Deere has the intake valve seat glued in with it!
To visit the JB Weld web page go Here
Hope this helps
Ernie |
Bharshman
| | Posted on Sunday, May 16, 2004 - 12:17 am: |
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Ernie -
I just bought a older 19ft ski boat, and after I got it home and ready for the water, I took it out, and after starting it, i noticed a water leak coming from under the exhuast manifold. So I peeled the gaskets off and redid them, and guess what, the leak was still there.. Well today I peeled the exhuast manifold off of the engine only to find a 14" or so hairline crack in the block, due to some idiot failing to winterize the boat.
The moral of the story, I jb welded it earlier today, we'll see if it holds :-) lets hope. If it works, we'll be on the water for the first time in this boat on Sunday (tomorrow) and i'll definately be writing JB Weld a nice letter if it holds up.
~Bryan |
ed kurzynski
Visitor
| | Posted on Wednesday, September 14, 2005 - 09:59 am: |
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i need to glue in a sprk plug coil insert that is a bit loose , . will jb weld hold up to the head temp , or do you know of something else. |
ernie
Senior Member
Username: ernie
Post Number: 571
Registered: 01-2002
| | Posted on Wednesday, September 14, 2005 - 05:03 pm: |
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Acording to JB Weld the 24 hour cure time JB weld is good to 680 deg F. |
David francis
Visitor
| | Posted on Friday, July 27, 2007 - 09:15 am: |
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I have discovered a small hole in my block(i have a 1990 ford 351 5.8 cobra). At first I thought it was a frezze plug that bursted out, but I am not sure. the block is so rusted it could be a weak round spot???. The engine runs like a champ, but since the hole came about it will not go into gear (drive or reverse) and water flows from the hole when it is running. I was hoping to either put a freeze plug back in, if that is the case, but if not, then i was thinking of using JB weld..anyone have any thoughts on that???? |
dennis welch
Visitor
| | Posted on Friday, May 01, 2009 - 12:36 am: |
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Howdy, I have a little wisconsin air cooled inboard to which I have added wet exhaust so I can use rubber exhaust hose. My very small pump actually pumps a little too much water, I envision a bipass from in to out of the pump to reduce the net output, can I use soft copper tubing for the bipass in sea water? |
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