I used Hylomar gasket dressing on the back of my water pump housing. Make sure you replace the paper gasket as this sealant is only a dressing for it, it's not to be used without some sort of gasket. The Hylomar sealant can be found at any Pep Boys. It says that one of the uses for it is water pump applications. Great stuff, it doesn't harden and it allows for easy disassembly in the future since it doesn't dry. As for the A/C idler pulleys, you will need to remove the pulley's with the bracket they are mounted onto off the engine. Next remove the bolts on the back of the pulley that are attaching the pulley/mounting stud to the bracket and knock the stud out of the center of the pulleys. Clean out the center of each pulley (where the stud was) with some brake cleaner and you will see that there is an internal "C" clip holding the bearing in. You will need a pair of C clip pliers to remove them. Each pulley has two of them, one on the front and one on the rear, remove them both. You will need the press the bearings out. What I did was I placed the pulley flat down onto an open vise, the vice was opened enough to allow the bearing to fall through. Don't clamp the pulley into the vice, just place it on top of the partially open jaws, like I said only open them enough for the bearing to pass through. I then placed a socket the same diameter as the bearing into the center of the pulley, resting on the bearing. Gently strike it with a hammer a few times and the bearing should come loose and come out. To install the new ones, Install one of the C clips into the pulley. At the other open end place the bearing into it and place the same socket you used to remove the old bearing on top of the new one. Again, make sure it's the same diameter, if it's smaller it may damage the bearing. It should sit on the outer metal portion of the bearing and it should also fit into the hole in the pulley. Give it a couple of gentle strikes until the bearing bottoms out on the C clip you installed previously. Install the other C clip and assemble it back onto the brackets and engine. Also be sure you replace the "O" ring seal. Steve --- In dmcnews@xxxx, "Jim Reeve" <ultra@xxxx> wrote: > Does anyone here know if I need some kind of sealant on the large > gasket for the back cover or the water pump? > > I am also attempting to replace the bearings in the AC idler (one has > almosted seiezed up!). But I am unsure exactly how I'm supposed to be > doing this. (I have the belt and bearying kit from PJ Grady). > > Any help will be greatly appreciated. > > Jim Reeve > MNDMC - Minnesota DeLorean Club > DMC-6960