Re: anatomy of the 2.0 T - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: anatomy of the 2.0 T
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Posted by Dean (more from Dean) on Wed, 3 Jan 2001 16:33:28 Share Post by Email
In Reply to: anatomy of the 2.0 T, Christian, Wed, 3 Jan 2001 16:01:21
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I believe that you are looking at the pipe that goes from the air inlet, upstream of the turbo, that vents the crankcase.

The larger hose goes to the valve cover. The smaller one to a small hose barb and orifice on the throttle body. There may be a check valve in the small line somewhere, can't remember. The check valve stops boost pressure from going back through the small hose.

When there is a manifold vacuum the crank case gases are drawn into the throttle body. When there is not a vaccum, or on boost, the gases blow out through the metal tube and go through the turbo.

You can remove the end of the small hose and determine that it id drawing air at idle, and that the orifice is not blocked.

The bigger hose may not fit the metal pipe properly in an older vehicle, as it seems to soften and swell from the blow by gases. If so, a couple of nylon wire ties will recify it. Duct tape optional :)

I don't know if things have changed, but the original arrangement is bogus. The two hoses should have separate access to the engine so that under idle, clean air is drawn through the engine to dilute the vapours and moisture.

To remove the black cover, lift up at the back, and after the back comes up, slide the whole affair back. Note the two pins on the front and the rubber gromlets that they unsert into, and the cast extension of the throttle body transistion casting which has rubber fitted over it, for the up-down fitting.

If you do your own oil changes, you will find that it is much easier to pour oil into the filler neck if the cover is removed. Saves wiping up spilt oil on it too.

While you are under there, you can check that hose clamps are snug.


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