theres several common methods, obviously some methods depend on easy access to the damaged area
IF you can easily get access thru the collector a small pipe expander can be used in most cases,
http://www.harborfreight.com/small-tail ... 37352.html
(1) but the one that takes the least skill is simply to fill the dented header tube with water and place the header in a position so the dents at the low point in the tube, in a large chest style freezer over night, as the water freezes it expands and tends to push dents up, now water only expands a small percentage of its volume so it may and usually does take 3-4 cycles for the water to freeze, thaw and re-freeze to remove larger dents
(2)the whole area around the dent can be slowly heated cherry red and a dent puller can be use in the slightly cooler center after a holes drilled to pull out the dent then the holes welded back shut
(3) some guys find its faster and easier to cut out the deformed section of tubing and cut and weld in a new replacement section of tubing
BTW MIG OR TIG WELDERs tend to be very useful but the old oxy-acetylene torch welders have some advantages because they heat a larger area
RELATED INFO
http://www.circletrack.com/howto/82886_ ... index.html
http://giantloopmoto.blogspot.com/2009/ ... -from.html
viewtopic.php?f=56&t=961
IF you can easily get access thru the collector a small pipe expander can be used in most cases,
http://www.harborfreight.com/small-tail ... 37352.html
(1) but the one that takes the least skill is simply to fill the dented header tube with water and place the header in a position so the dents at the low point in the tube, in a large chest style freezer over night, as the water freezes it expands and tends to push dents up, now water only expands a small percentage of its volume so it may and usually does take 3-4 cycles for the water to freeze, thaw and re-freeze to remove larger dents
(2)the whole area around the dent can be slowly heated cherry red and a dent puller can be use in the slightly cooler center after a holes drilled to pull out the dent then the holes welded back shut
(3) some guys find its faster and easier to cut out the deformed section of tubing and cut and weld in a new replacement section of tubing
BTW MIG OR TIG WELDERs tend to be very useful but the old oxy-acetylene torch welders have some advantages because they heat a larger area
RELATED INFO
http://www.circletrack.com/howto/82886_ ... index.html
http://giantloopmoto.blogspot.com/2009/ ... -from.html
viewtopic.php?f=56&t=961