Question about 1995 Mercury Grand Marquis

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Water in the Oil. Head gasket was replaced and still leaks water into the oil. Could this be a freeze plug under the timing chain leaking water into the oil pan?

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  • joeanddi Jul 03, 2010

    The heads were checked and it isn't a cracked head. The shop tells me it is a cracked block. Another mecanic tells me that the freeze plug should be checked. He has seen this problem on this engine. The question I have is this soemthing that should be considered, befor spending a lot of money replacing an engine that only has about 80K miles.

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Your block is cracked. Your engine is probably no good.

Posted on Jul 03, 2010

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Could be or a cracked block or head cylinder

Posted on Jul 03, 2010

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2 Answers

Water keeps getting into the oil


The problem will probably be corrosion holes behind the water pump impellor. The water passes into the sump from these holes.

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2004 vw touareg 2.5 tdi the oil sump was full of water and oil mix,also inlet manifold had oil and water mix.number 5 cylinder had locked up and engine would not turn,so i removed glow plugs and cranked...


Can not be water pump, because that has a vent hole to the outside, and does not at all allow access to crankcase or cylinders. Oil cooler is also unlikely because oil is under more pressure than the water, and it would not get into the cylinder.
Water in the cylinder means up high.
That means head gasket or cracked head.
You can tell with a leak down test.
You borrow the gauge from a place like Autozone, and replace the water reservoir cap with it. Over pump it, about 30 psi. And watch for leaks. If same cylinder keeps filling, then you know where the bad gasket or head crack is. Diesels often crack heads. Not hard to do, but new head is not cheap. Probably $500 for part, $400 labor.

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1 Answer

I have a leak around timing chain cover.Is there a gasket i need to replace or something more serious? the leak is on a 1987 Mercury Grand Marquis ,5.0L.


u didnt indicate what is leaking oil or anti-freeze there is a gasket for the timing chain cover (oil) but the water pump is there also (anti-freeze)

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More than likely (and hopefully) it is the timing chain cover gasket. Common problem on Tauruses with the Vulcan V-6. Had the same problem. Replaced gasket and leak stopped. Not cheap if taken to a mechanic, but is doable if you have some experience and the equipment.

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You are probably correct -- it's a blown head gasket.

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This sounds like a blown cylinder had gasket. Although on some engines you will find core plugs below the rocker coverin the head.

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Water leaking from a freeze plug and water in the oil pan in a 283 small block chevy engine


If you have a bad or leaky freeze plug, also known as soft plugs, it needs to be replaced. Your brass plugs are the best, and in some hard to get to places there are rubber plugs that can be adjusted to fix the problem. But if you have oil in the oil pan, assuming no one put water in the engine. You probably overheated the engine enough to acquire a cracked head gasket. Normaly that's the problem, could be a cracked head also, but more than likely a gasket. If you decide to remove the heads and replace the gaskets, good idea to have the heads resurfaced. (recommended)

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