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Old 08-30-2012, 06:48 PM
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350 Crank Shaft Question

I am puting everything back together on my 350. Today I took out the bolt from the crank shaft and I noticed the first 2 threads on the bolt looked rough. So I went and bought a new bolt and it seems a little harder than normal when I try to put the new bolt in. I only went about 2 turns in and then stopped. I looked in at the threads of the crank shaft and I couldnt visually see any damage. I am not sure what to do from here. I dont want to cross thread or damage the cam shaft. Any suggestions?

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Old 08-30-2012, 06:51 PM
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Run a thread chaser thru the crank threads , that'll clean it up !
dave
caution ... using a tap is NOT advisable !!
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Old 08-30-2012, 07:33 PM
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Ok. What exactly is a thread chaser and how do you use it?
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Old 08-30-2012, 09:33 PM
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A thread chaser is a tool used to straighten up threads instead of cutting new ones like a tap will. You use it the same way as a tap. Use anti seize on the chaser when using it to make it easier to do it's job. You should be able to get one online or at a good auto supply store. I believe you will need a 7/16"-20 thread chaser which is the same size & pitch as the bolt.
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Old 08-30-2012, 09:42 PM
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Ok great. Thanks
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