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6.5 diesel problems

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gary

09-22-2002 20:06:38




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Hello, I've a 98 chevy with the 6.5, 106000 miles. Problem was it was drove home hot and cracked a head. When the head was pulled off, it was found to have a blown headgasket, that had apparently been blown for some time, as it had etched a good groove in the block. Seems to be right on the outside edge where the compression ring in the gasket will set. The machinist says the block cannot be milled over .0010, which isn't enough to get the etching out. My question is, can I fill this etching with something like JB weld and expect it to hold a gasket? Is my best bet another motor? Thanks for your input guys

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Ludwig

09-24-2002 11:16:41




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
I sat and thought about this awhile and found myself saying 2 things.
#1 the 6.5 engines are fairly common and your truck is pretty new so it might just be worth a new block...
#2 if you JB weld it and it holds for awhile you've won something anyway...

So thats what I'd do, grind your groove and get it good and clean. Grind some slots across it to help the weld have something to stick to and then fill 'er. Then sand it fairly smooth, coat with a thin layer of ultra black, new gasket and run 'er.
If you get a thousand miles you get a thousand miles. JB Weld is cheap, and if you need a new motor anyway..... ..... ...

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Bus Driver

09-24-2002 16:58:19




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 Re: Re: 6.5 diesel problems in reply to Ludwig, 09-24-2002 11:16:41  
Ludwig, I like your basic idea of trying to salvage the block. We used to do a lot of that- at one time, if you looked under "poor" in a pictorial dictionary, our family portrait was featured. But the grinding of the gap increases the area that the epoxy must hold and probably decreases the chance for success. I would sand by hand just that area to bright metal, degrease with lacquer thinner and then use the epoxy as TBone suggests. Silver solder would be a bit more work, but offer better chances for success. The Diesel creates more pressure than does the gasoline engine but the temperature in the cylinder is usually a bit less. This is just opinion-I have no experience with repairing a Diesel block this way.

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ErnieD

09-23-2002 15:45:02




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
Can you inlay a metal o ring, I guess some really high compression dragsters are set up that way, don't know the cost though.



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smurph72

09-23-2002 15:44:39




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
My dad used to sell for a company called Belzona Molecular. They have epoxy products similar to JB Weld, but better. JB Weld has some shrink to it when it cures. This stuff has zero shrink to it. Worth a try if you can find a distributor. Email me if you want the distributor's name here...

dcm



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Unimog

09-23-2002 14:35:38




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
I learned at the knee of an old time mechanic and
I watched him silver solder a damaged block on a
292 Chevy 6. That repair lasted another 45,000
miles and was still holding when he sold the
truck. I don't know if the higher compression of
a diesel would push it off or not, but I think it
would be better then JB Weld. This is silver
solder not the plumbing solder if you try it.
Good luck.

Unimog

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ABC

09-28-2002 18:22:48




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 Re: Re: 6.5 diesel problems in reply to Unimog, 09-23-2002 14:35:38  
better to use 3/32" nirod with a DC welder, have repaired lots of blocks & heads this way and they last as long as the engine.



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Peter(NY)

09-23-2002 08:58:41




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
Hi Gary,

Someone had written on this post I believe a few months ago that had used JB weld in the same scenario and said it worked. Maybe check the archives for it.



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T_Bone

09-23-2002 21:04:11




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 Re: Re: 6.5 diesel problems in reply to Peter(NY), 09-23-2002 08:58:41  
Hi Gary,

That was probably me. My 79VW diesel didn't like to keep headgaskets very long, 25k to 50k. Naturally the headgasket blew in Ely,Nv where VW diesel parts are very easy to find and in "stock".

I mixed the JB to a semi-hard state when dried. After a trial mix, then I coated the block and AL head about 1/32" thick with JB, used the old headgasket, torqued head and let set-up over night. It lasted for 25k at normal usage then another 25k with sodium silicate to seal pin holes.

Don't get it too thick or it will stick a ring upon start up. That took a couple days running before the ring(s) came loose and sealed or about 1000miles.

If you have a crack I don't think this will work for you but I like the 15% silver solder idea along with a sealer for a cheap quick fix.

Of course theres only one correct way to fix it right and not with JB

T_Bone

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Kendall

09-23-2002 08:28:05




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
I dont know if this would work on a block, but I once had a crankshaft welded up and reground to specs. I know welding cast iron is an art, but if you could, then mill it flat, you could let us all know if it worked after running it a while.



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Greg(Mo)

09-23-2002 04:13:12




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 Re: 6.5 diesel problems in reply to gary, 09-22-2002 20:06:38  
Gary, I'd just look for another engine. JB weld is
amazing stuff, but I wouldnt expect it to hold up
in that area of intense pressure, heat & vibration.



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