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Unread 12-04-2006, 01:27 AM
76GMC1500 76GMC1500 is offline
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Default Re: water in the oil

Before you replace the manifold, pressure test it by making a plate to cover the water outlet, plugging the rear water inlet hole, and inserting an air fitting in the front. I think the pressure test is supposed to be performed at 40 psi, that seems a little high and my memory is sometimes wrong. You should know if you have a problem by 20 psi.
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