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Pinning Cracked Head

A

Anonymous-0

Well-known Member
I've been reading about metal stitching a cracked head. Has anyone out there every had any dealings with doing this? If so, I'd sure like to hear any feed back you have.
 
Yes, I have done it several times. If it is done done right, it works well. I learned the process while working for Cat on machine tool castings. I have done 2 Cyl. Deere heads and blocks. I did one JD B head right in the combustion chamber. It held up as long as I owned the tractor, 7 or 8 years. I have a head in my shop to do now, if I ever get to it! Email is open.
 
Where do U order the product to do the job with?? Or do U used screws, bolts and Loctite, JB WELD or something of homemade stuff?
 
Small taper taps, tapered plugs, and overlapping drill and tap. Some pins can be made, some bbrass, some commercial. Google it. I have seen 1/8" pipe taps, and brass pipe plugs work well. Drill the crack ends before doing it or the crack can propegate further. JimN
 
Irontite makes the tapered pins. Work well. Lock & Stich also has a system. Each has advantages. One Irontie pin (Size 327 I think is the same pitch as 1/8 inch pipe thread. What do you want to pin?
 
we overhulled the motor on our 48 willys jeep after we put it back together the head was cracked called the machine shop that cooked and decked the head because they were also sopose to check it for cracks and fix it befor it came back they sent a man to our shop and pined the crack whith head in place so far its holding up great best thing is you cant tell it was fixed unlike welding and everyone can see it
 
I have a 2 cylinder cast iron head that was run hot It has a crack between the valves. I though if I could pin it, then take to machine shop and have them resurface the valve seat that would take care of it. All of U seem to B very positive about this. The way I see it, I don't have much to loose if it don't work.
 
Pinned a crack in the head on my 1941 JD A about 20 years ago and still holding fine. As long as both ends of the crack can be gotten to I think it will work good. I had a crack under a valve seat insert on my 1948 JD D which we pinned. It held for a few years, but finally spread into the intake passage and I had to scrap the head. I'd try it if it was mine.
Paul
 


NL,

I have both iron tite and lock & stitch plugs

in the shop,and both work well. L n S are much

more expensive but in many cases do a much

better job.The tapered pins tend to push a

crack apart and the LnS tend to pull the

crack together due to the hooked thread shape.

Email is open if you want to chat about

how they work .

george
 
Way back in the day when they was nothing better available. Or a temporary pinning maybe ok in emergencies.
Today the proper repair is ........................http://www.midwestcylinderhead.com/
 

goodson has about the best price on crack repairing supplies. ive only fixed a thousand cracks with pins. on heads cracked between the valve seats , you have to take the seat out first if it has removable seats. then find the ends of the crack with magnaflux.you want to eliminate the ends of the crack during the repair so it doesnt continue to crack.so drill the end of the crack, flux it and look for the crack in the hole you drilled to be sure you got it all. pins need to be overlapped into each other and then peened as the final step. then new seats installed. the pins dont work well on thin parts of the head but combustion chamber area is usually pretty thick..lucas
 
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