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Leave the Intake Manifold on there, take the large hose off the throttle body and get a good light and shine it in there from the front side of the engine. You don't have to take all that loose to clean the breather box. Lord knows as many times as it took to get that breather box leak on Inga fixed I should know.
And you don't have to plug off the fuel lines to change out an Intake Manifold gasket if that is all you need to do.
The oil separator box is held in place by just two 13 mm bolts on the side of the box. You can easily reach them by reaching around the back side of the throttle body with your right hand and leaning over towards the front of the car and looking in. I use a 1/4 inch drive on a short extension. After you pull the two bolts out, then all you have to do is lift straight up on the box. Take it out via the grill side of the engine and that is all there is too it.
Clean the box in a solvent for a couple of hours and have a couple of new o rings standing by. You want to get all that solvent out of the box before you install it in the car.
Guide the box in over the two holes and with the new o ring installed and guide it into place. You will see it drop into place when you get it lined up. Just don't get carried away and try to shove it into place. When you install it and you have nothing to worry about. Install the two bolts (after you get it lined up and in place) and get them snug. Then install the flame trap and hose, that were just cleaned. Inspect the bottom side of the large hose for holes and or cracks, and you will be done.
By the way, the test for a blocked up breather box is the same one as for a clogged flame trap if you have a chrome oil cap. You just loosen it so you can remove it but leave it sitting in place with the engine running. It sits there and vibrates with the engine, you have a positive pressure. The cap rattles around like a pressure cooker valve and you don't. The other way is to put your hand over the valve cover hole and see if you can fell a vacuum. You should, and if you don't you are headed in the right direction cleaning the breather box and flame trap.
Good Luck,
Paul
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