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Coldman
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If you post up some pics he might have a better understanding of the repair.


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pavetim
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Its very hard to see but inside the exhaust port there is a hole. It was attempted to be repaired but it still leaks and wasn't a good repair.
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Coldman
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Sorry to keep troubling you. Is it possible to circle the problem spot with a sharpie and maybe shine a torch in there when you snap a pic?


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Coldman wrote:Sorry to keep troubling you. Is it possible to circle the problem spot with a sharpie and maybe shine a torch in there when you snap a pic?
BTW,
"Torch" is UK English for "flashlight"....
Coldman
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oops sorry. My bad. Usually try to modify my text to allow for my gum chewing brothers. :D
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pavetim
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See that spot, that's a hole into the water jacket.
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exnailpounder
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That's gonna be a tough one. If it could be backed up with something it might be doable. If Jody does that I hope he makes a video about it. I would be asking the person who ported it for a new head before I spent any money on that one. MHO.
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pavetim
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He tried to fix and didn't work and you cannot back it. He replaced the head but I am down for awhile now, missed my race series and chance at $1000 but I figure if i can fix it ill have an extra head and not a expensive paper weight. Habe my heard anything back from Jody but yeah a video would be cool.
exnailpounder
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pavetim wrote:He tried to fix and didn't work and you cannot back it. He replaced the head but I am down for awhile now, missed my race series and chance at $1000 but I figure if i can fix it ill have an extra head and not a expensive paper weight. Habe my heard anything back from Jody but yeah a video would be cool.
Got it. I thought this might be a hard to find head or something like that. If it can't be backed then it's going to be difficult. I did a repair on a very thin tab inside a side case on a quad that was actually cast into the block of the engine once and it worked but I was able to back it up with some copper but it still wasn't easy and all it wanted to do was melt away.
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pavetim
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Yeah i figured it would,be hard and if Jody says it can't be fixes ill give up., I was looking into those extreme high temp ceramic pastes but im afraid it will break free when I am 30 feet in the air lol. I know its water cooled but I wonder how hit that wall really gets cause those pastes say can withstand close and some to 2000F
exnailpounder
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pavetim wrote:Yeah i figured it would,be hard and if Jody says it can't be fixes ill give up., I was looking into those extreme high temp ceramic pastes but im afraid it will break free when I am 30 feet in the air lol. I know its water cooled but I wonder how hit that wall really gets cause those pastes say can withstand close and some to 2000F
I wouldn't trust any of those miracle concoctions. JB weld worked on the windshield grommet on my Harley but other than that I have never seen a "miracle in a tube" ever work properly for anything :lol: I would suspect your engine getting a good gulp of water at altitude and locking up might alter your evening plans :lol: I hope Jody would take this on as I bet there are a whole bunch of us that could learn something from it. I have seen some good welders pull rabbits out of a hat before so almost anything is possible.
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pavetim
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Maybe Otto can touch base with him and see if he would be willing to take it on. I wouldn't even be mad if he wasn't successful, I know it may turn into a can of worms. The guy that did the head tried to fix it and weld it so there is a "base" there so maybe jody can just pick up on that. We will see if I can get ahold of him.
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pavetim wrote:See that spot, that's a hole into the water jacket.
Is that spot bright because of reflection, or because it's back-lit with a bright light in one of the water jacket ports?

I refuse to believe it's totally impossible to back this up... A length of #6AWG bare copper ground wire, with the end hammered into a flat or spoon, then bent in creative ways, even using the jacket paths to accomplish parts of the bending...

I have an email out to Joey (Jody's son) on another matter at the moment. When I get a reply, I'll bring this up. There's certainly enough information here for him to decide if it's worth looking at.

I, personally, would love to attempt this myself if Jody writes it off. After all, at that point, what is there to lose? My biggest gripe is the previous attempt at repair by someone who should have just said, "Oops!" and referred it back to you and involved more experienced welders. This affects the back side, inside the water jacket, and may require opening the hole more to remove whatever residue is there from the failed attempt.

Steve S
pavetim
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I have a borescope at work ill check it out next day or so and see how it looks from backside. I had a flashlight in the water jacket that's why its bright. Yeah Otto that's creative and something like,that backing idea could be done, water jackets are small that's why i said you cannot back it.
exnailpounder
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Last edited by exnailpounder on Tue Mar 14, 2017 8:04 pm, edited 2 times in total.
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exnailpounder
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pavetim wrote:I have a borescope at work ill check it out next day or so and see how it looks from backside. I had a flashlight in the water jacket that's why its bright. Yeah Otto that's creative and something like,that backing idea could be done, water jackets are small that's why i said you cannot back it.
Are you planning on having the welds ground down so as to smooth out the air flow/water flow? I don't know the contours of the shape of the passages of that head but you may have eggshell thin metal for quite a big area which could result in a huge weld area. What is the head made of by the way? I think I see dis-similar metal valve seat inserts into a cast aluminum head?
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exnailpounder wrote:.
Exactly! Jeff you have a talent for being concise. :lol:
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exnailpounder
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LtBadd wrote:
exnailpounder wrote:.
Exactly! Jeff you have a talent for being concise. :lol:
What ...??? :lol:
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pavetim
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Yes I will smooth welds out for airflow. Head is aluminum and the valve seats are beryllium copper and valve guides are manganese bronze, you have to use those exotic materials when you run titanium valves. Here are more pics for reference you should be able to see where he repaired it. I suppose if we had to we could open up the slits on the bottom which are the water jackets, build it back up and ill have the head machined flat again. But I don't wanna spend a fortune to do this so we will see what you guys or Jody can do.
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dirtmidget33
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Some head work actually has epoxy applied to ports to aid in achieving desired flow. This could possibly be done to your head to repair it. These epoxies are not the cheap cure all JB weld type stuff. Suggest contacting a good motor designer/builder that specializes in custom blocks and heads. Places I dealt with like Gearte, Esslinger, Stanton, and ed pink could prolly point you in right direction. Cost of doing this could be more then your head.
why use standard nozzles after gas lens where invented. Kinda of like starting fires by rubbing sticks together.
pavetim
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This is exhaust port so have to consider combustion heat, that's why I am not trying the epoxy method.
cj737
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Pavetim - There's a guy in Georgia, Jim French, who does automotive micro welding and I guarantee you two things: if it can be done, he cano it perfectly, and he is just about the nicest and most humble guy you'll ever come across. Here's a reference to his work (and a spectacular head specialist who can help you out if you get stuck)
http://forums.sohc4.net/index.php/topic,158036.0.html

Pardon the link offsite gents :oops:
pavetim
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Sweet, I sent him am email with some pics. Thanks.
pavetim
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Jim French said he can do the repair for 50-75 bucks, thats if nothing goes wrong like the hole opening up cause walls are too thin. So cross my fingers.
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pavetim wrote:Jim French said he can do the repair for 50-75 bucks, thats if nothing goes wrong like the hole opening up cause walls are too thin. So cross my fingers.
Excellent! I might have touched it for a price in that neighborhood, but head work is not my forte' so I'd have offered caveats and exclusions and all the legalese I could come up with. I would, however, have wanted a go if no one else would touch it. As I said previously, if no one thinks it can be done, what's there to lose? I will tackle anything I'm told "can't be done", and usually come out on top.

Steve S
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