Here is another one of the tricks I learned over the years and included in our March 2013 Newsletter and will share here:
Removing the Oil Dipstick Tube
by Jason Edge
This might seem like an easy task but removing and installing a dipstick tube in an engine block without damaging the tube is not that easy, but I have a sure fire “trick” that I will share with everyone. The problem is if you just try to grip the tube with pliers and twist and turn out, or even worse take a hammer and punch out from the bottom, you are guaranteed to damage the tube.
For removing the tube, the trick is to take a deep set 11mm 12 point socket and slide on the bottom of the tube, and gently tap the socket with hammer, pushing it out. You will be able to remove the tube up to a point before the lip of the socket hits the bottom of the block. You can then take an 11mm open end wrench and put around the tube next to the seat ring and tap the wrench head with hammer to drive the tube the remainder of the way out. (Note: if tube is sliding out nice and smooth with deep set socket, you can switch to a short regular 11mm 12 point socket, once you reach the block with deep set socket, to push it through that much farther without switching to the open end wrench).
For inserting the tube, lube the block where tube is inserted with WD40 and set the 11mm open end wrench head against the seat ring and gently tap the tube into the block until the seat ring is against the block. I have removed and installed at least a dozen dip stick tubes in this manner over the years and works perfectly every time.
Note: 7/16" Socket & Wrench will work but 11mm will give you a tighter fit.