The fog test was an excellent final test for vacuum leaks on the intake manifold. All openings were sealed up with tape first, then 2 or 3 psi of compressed air was used to pre-check for gross leaks, which worked very well !! I used a stethoscope to listen closely for hissing produced by leaks. A piece of tubing held to the ear would also work. Now I’ll have high confidence that the intake is leak free once it’s bolted to the cylinder head.
An important step in prepping the intake manifold for the 4.0 Jeep engine, is to remove all of the carbon inside the first 2 inches of the intake runner, and especially the fuel injector ports. This carbon is soft and doesn’t require fire or even oven cleaner. Just a little carb cleaner, a few paper towels, and a hack saw blade, as you will see. There is no more carbon after the first 2 inches.
Was so happy to get the intake and exhaust manifolds out at the same time tonight. The egr tube connects them both, had to be removed after I got them out. Removal was simply unscrewing the 2 nuts off of the exhaust pipe flange, plus a couple of vacuum lines. The whole reason for this is so the cracks in the exhaust manifold can be welded up. I’ll take it over to my neighbor and we’ll see who’s brave enough to try and weld it up !! The driver’s side motor mount lifts upward when engine torque is applied. Plus I ran my phone over tonight with the creeper. Crack !!!