4.6 intake gaskets

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Mar 5, 2004 | 07:23 PM

Ford79

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From: Hampstead, NC

4.6 intake gaskets

Is it common to have an intake gasket blow out and dump coolant into an intake port? I helped a friend remove the top end of his 4.6 in a 99 F-150 today. We found that the seal between the coolant passage and the intake port could possibly be leaking. The plastic of the gasket was pulling away from the silicon bead that seals the port(should have got a picture). This is on the front passenger side cylinder, where the two passages share a seal(same as the rear driver side). We're hoping to not have to tear it down further (for head gaskets) than it is for obvious reasons (major PITA).

Mar 9, 2004 | 05:04 PM

eldred97

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I don't Know if this is a common proplem, but my '97 f-150 4x4 with a 4.6L and 150,000 miles just started a small leak into the valley under the intake and is making is way into one of the cylinders, don't know which one yet. It is skipping somewhat at idle, and collecting some condensation under the oil cap. This sucks for me because I am 12 hours out of town in Troy,ohio. But I have 3 weeks to get it fixed before I go home.

Mar 12, 2004 | 04:40 PM

Ford79

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From: Hampstead, NC

It turned out to be the problem on my buddy's truck. We replaced the intake gaskets and no more coolant use or mis-firing. It was the gasket on the passenger side that was leaking, between the water port and intake port (they share a seal) on the gasket. The new gaskets have separate seals for the water and intake ports, so it shouldn't leak anymore.

It would either leak on the passenger front or driver rear port, this is where the gaskets share a seal. Also, replace the plugs and wires while you have the intake off, it's much easier.