In your description , I must assume the dip stick tube is the correct one for the block, i.e...... is the tube the correct diameter to acheive a tight interference fit ? Have you tried to purchase a new tube to compare ? If you are using the correct diameter tube for the block with a good interference fit., This application sees a lot of vibration and
oil so you need the right product, OEMs use these types of adhesives. LOCTITE makes a product that can bond/seal the tube (steel) into the hole but only if its a tight interference fit. Take a look at the 600 series products at this link.
http://www.henkelna.com/cps/rde/xchg...D0000000389%7C
Google their products to learn more. But if the tube is too small, no amount of sealant or glue will fix it for long.