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9N Exhaust

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Author  [Modern View]

11-09-2019 05:55:01

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After 20 years my 1941 9N finally started leaking around the #4 cylinder. Block is pitted (probably prior to my ownership) and manifold is also pitted. New manifold is on order. Will follow Bruce(VA)'s tip #53 for the block pitting. Again, prior to me the stud by #4 is broken with about 1/2 inch of usable threads in the block for a bolt. Someone tried to remove the stud because it has been drilled through to the water jacket. I am hitting it with PB Blaster until the new manifold arrives.

Any opinions on the odds of getting the remainder of the old stud out after being stuck for more than 20 years?

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John Deere D

11-09-2019 11:18:12

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 Re: 9N Exhaust in reply to jimNtx, 11-09-2019 05:55:01  
I've been very successful using a LEFT HAND DRILL...:)


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John Deere D

11-09-2019 13:01:04

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 Re: 9N Exhaust in reply to John Deere D, 11-09-2019 11:18:12  
OK...left hand rotation DRILL BIT....

Every dog has their day..........:(


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Jim L WA

11-09-2019 10:48:13

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 Re: 9N Exhaust in reply to jimNtx, 11-09-2019 05:55:01  
I would say it will alter the approach. I would consider drilling it out with a drill bit just less than the diameter of the stud, then clean the remainder out with a tap.

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11-09-2019 10:29:10

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 Re: 9N Exhaust in reply to jimNtx, 11-09-2019 05:55:01  
The stud is broken off at a point about 1/2" inside the block surface. A previous owner just used a bolt to attach the manifold. Does this alter the approach to removal??

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Bruce (VA)

11-09-2019 06:54:25

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 Re: 9N Exhaust in reply to jimNtx, 11-09-2019 05:55:01  
All of the studs go into the water jacket. So that isn't an issue.

You need to heat the stud w/ a torch, apply the PB Blaster. 2 or 3 times. Or 5 or 6 times.

But, the quickest and easiest way to get it out is to weld a nut to it.

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