I have an emergency repair to perform on an aluminum auto engine block. A 5/8" O.D. steel pipe heater hose nipple blew out due to shipping damage. The original is a 2" long piece of thin wall steel tubing that was pressed in about 5/8" deep.
The hole in the block is still round and in good shape, the nipple is bent/distorted/unusable. I'm going to make a new nipple at home tonight from a generic, screw-in steel replacement from the auto parts store. The engine is installed in the car and there's not enough clearance to either tap it out to the closest pipe thread or press/drive in the replacement nipple. The nipple I bought has a hex flange and pipe thread but I can turn all of that off leaving a smooth O.D. to work with.
I'm thinking the green Loctite "retaining compound" (I forget the number) will hold it fine as long as the surfaces are clean, dry and the clearance is right.
A) D'ya think a steel nipple is favorite or should I make the new one from aluminum to take advantage of any expansion characteristics.
B) Any idea what the optimum clearance would be for the Loctite?
C) If not Loctite, anything better? JB Weld is good stuff but not sure about it's living around the heat of a modern engine's cooling system.
Yup, all of those "If you don't have time to do it right you don't have time to do it all over again" thoughts are rattling around in my head but I'm thinking there can be an easier way than pulling the engine back out and pressing/threading in a replacement.