Re: EXHAUST PIPE ON A M

Posted by SadFarmall on August 23, 2012 at 01:47:40 from (121.79.15.250):

In Reply to: EXHAUST PIPE ON A M posted by S2710 on August 22, 2012 at 13:20:09:

You may have to use a High Speed Steel Tap and sufficient thread cutting lubricant to clear these threads. You should also take care to remove fragments of metal from the thread in the manifold, which have remained from the exhaust pipe. Most of these remains can be dug out with a small flat screwdriver or a suitable spike.

If pieces of metal are jammed in the threads, the tap is likely to squeeze them tighter and tighter into the thread with the possibility of:

a). damaging or destroying the thread

b). damaging the tap

You should have no trouble cutting thread in cast iron, but remember that 2" is a large diameter, so you are trying to cut or chase out a fairly large amount of thread each revolution of the tap, so patience, cleanliness and thread cutting lubricant (diesel works well) are required. If you see pieces of metal sitting on the flutes of the tap and threatening to choke the cutting teeth, unscrew the tap and wash these pieces off. Good luck.

SadFarmall

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