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9n Engine Block Material

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9N'er

05-24-2000 11:37:23

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Is the engine block for a 1940-41 (serial no. *36149*) 9N made out of cast steel or cast iron? I need to weld a hairline crack...and need to know wether it is steel or iron. thanks!!! (There is a hairline crack just above the starter, and below and to the right corner of the head about 1.5 inches long).

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llamas

05-24-2000 12:26:19

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Re: 9n Engine Block Material in reply to 9N'er, 05-24-2000 11:37:23

Best of my knowledge, it is gray cast iron. High-nickel rod is de rigeur.

Good luck with it, that's a challenging location to weld.

llater,

llamas

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9N'er

05-24-2000 15:50:12

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Re: Re: 9n Engine Block Material in reply to llamas, 05-24-2000 12:26:19

Thanks Llamas. I was afraid of that! steel would have been easier and a little more forgiving. "De riguer?" help me with that, my French is non-existant...are you saying that high nickel rod is the choice to use? Another post suggested this approach for cast iron: "Terminate the crack by drilling 1/4" hole or also welding a small (about 1" square) flate plate of steel just beyond either end end of the crack. If you use the plate method, place the welds parallel to the crack and only weld the plate on those two sides. Prep with "U" groove and maintain interpass temps that allow for no more than 300 degrees F heat build up in the part. Backwhip to prevent undercut and stress relieve between passes by peening. Use stringer beads and DC+ polarity if you have that option. A 3/32" electrode would also be a plus." You know what Llamas? I think I'll stick to weeding the garden from now on and forget about taking on a new and different adventure (just kidding...this tractor renovation has been a blast...expensive, but a lot of fun). 9N'er

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llamas

05-25-2000 04:24:38

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Re: Re: Re: 9n Engine Block Material in reply to 9N'er, 05-24-2000 15:50:12

Sorry for being facetious. Yes, high-nickel rod, absolutely. In this location, you likely don't need too much strength as much as you need it to hold the water in.

I'd get a Lincoln 99 rod in 3/32 if I could get one. The lowest current that will give you a relatively stable arc, and the shortest possible welds - little sissy 1/4 inch beads. The idea is to keep the heat as low as possible. Lots of little beads, spaced out, that backstep over each other, with a long wait between each one. It could take you all day to weld this shut. Peening each bead while it's still soft is not a bad idea.

Yes, as the other post said, you'd like to get the IP temp up over 300�F, and over 600� would be better. But I'm guess that that's just not practical for you.

GLWI!

llater,

llamas

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JCE

05-25-2000 03:40:20

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Re: Re: Re: 9n Engine Block Material in reply to 9N'er, 05-24-2000 15:50:12

Drilling a small hole at the ends of the crack is a good thing to do. You must grind a v in the crack and make sure you have clean metal, that grind should be all bright. Use a machinable cast iron welding rod with DC reverse pol. Weld a short pass, slag it and do another. Take your time. With the good cast rod, you can put your hand on the weld shortly after you put it on.

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9N'er

05-26-2000 18:15:16

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Re: Re: Re: Re: 9n Engine Block Material in reply to JCE, 05-25-2000 03:40:20

Thank you Llamas and JCE. I appreciate this advice. Now here's the problem; I have to pay a guy 45.00 an hour to come here and site weld. I'm not sure what to do if it's an all day job. Man, oh man, that's a lot of beer or a lot of money. What do you suggest? The fella from the machine shop came over today to look at it. He said let's wait for a warmer day (it was overcast today and in the 50's) and the iron was cold to the touch. He said preheat, and cooling down is key; and doing it on site has it's challenges...he said the third element to welding cast iron is a prayer. I'm hoping it will be a two-three hour job at the most! God willing now! Now I can say that doing this tractor is coming down to money, beer, time, education, sweat, blood, tears and a prayer. NO WAY AM I EVER GOING TO SELL THIS 9N AFTER ALL OF THIS OVER THE PAST TWO MONTHS. -9N'er

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