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  #1   IP: 162.83.223.19
Old 11-17-2023, 06:07 PM
BenCT BenCT is offline
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Broken bushing(not sure if right tern) in exhaust manifold

Now that I broke this trying to take it out…not sure the next step. See photos below, last photo is what it looked like before I broke off the top of the bushing from the exhaust manifold. Worried if I cut it out with a saw that I damage threads and/or metal falls into exhaust system.
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  #2   IP: 162.245.50.254
Old 11-17-2023, 07:24 PM
Dave Neptune Dave Neptune is online now
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The coolant passage on the manifold has no access to the exhaust system within the manifold. Don't try to saw out the threads as it would be almost impossible to seal after sawing into the threads. An easy out may work if the rest of the fitting is not to tight or corroded into place. If the easy out does not work without to much trouble STOP.

If you remove the manifold which is not a big job the fitting can be drilled out and the hole tapped to the next size larger pipe thread. If you do not have the talent an automotive machine shop could do it easily without much ado.

Tapered pipe threads need to be pretty pristine as it is the taper and the threads that do the sealing.

Dave Neptune
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  #3   IP: 162.83.223.19
Old 11-17-2023, 07:36 PM
BenCT BenCT is offline
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I will try the easy out. This manifold was just installed in April so it can’t be too corroded. Prior mechanic who installed it used blue plumbers dope. I used pb blaster, but didn’t seem to do the trick.
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  #4   IP: 73.100.197.196
Old 11-17-2023, 08:55 PM
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hanleyclifford hanleyclifford is offline
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The same thing happened to me once on the road in the exact same place on the manifold. I was able to repair it on the anchor because I carry NPT taps with me. Get the correct drill and drill out the dead brass which should be easy because it is softer than the iron around it. Should be 1/2" NPT. When you replace the nipple use black iron which should keep it from happening again. 1/2" calls for 23/32" bit.

Last edited by hanleyclifford; 11-17-2023 at 09:00 PM.
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Old 11-18-2023, 08:19 AM
BenCT BenCT is offline
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What is everyone’s thoughts on applying heat here? Definitely not using a torch. Feel very comfortable with a small rope cutter type device but am tempted to use a heat gun. Isn’t that far from carb, but is pretty far. I’m still real timid about anything gasoline on this engine, but wondering if I’m being too cautious and could get away with heat gun here to heat the stuck brass fitting in the exhaust manifold.
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  #6   IP: 73.100.197.196
Old 11-18-2023, 01:27 PM
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hanleyclifford hanleyclifford is offline
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The brass will expand more than the casting, just getting tighter.
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