2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Lots of water in oil???

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Old Apr 9, 2012 | 02:48 PM
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Lots of water in oil???

So I have this 87 n/a sitting in my yard, a buddies car that's been sitting for a few years due to a "blown head gasket". Since I have a couple FBs, he wanted me to diagnose and fix it. So I tow it home, jack it up, pour water in the radiator, and it starts streaming out the oil pan gasket. I pull the dipstick and sure enough, the tube is brim full of water! I've seen some strange things with rotaries, but I cannot imagine what could be allowing water into the oil? On my FBs, there's really not any way for water to mix with oil, save for the beehive oil cooler that's not even present on this FC. Anyone with more 13B experience have any ideas? When drained the milk out of the pan and left the plug out, water poured out of the pan as fast as I could pour it in. What gives?
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Old Apr 9, 2012 | 04:47 PM
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Cracked housings. Blown coolant seals. I think that pretty much covers it. Clearly, it's bad, and the only way you'll know is to tear it down.
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Old Apr 9, 2012 | 04:53 PM
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AH - I know this one! I tore my engine down three times looking for bad coolant seals or a cracked housing / iron. I still almost didn't find it.

The answer is FREEZE PLUGS. There are a couple of them behind the front cover.

You technically do not have to detension and tear the engine down to repair but you do have to remove the pan and front cover.
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Old Apr 9, 2012 | 05:08 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by 7dust
AH - I know this one! I tore my engine down three times looking for bad coolant seals or a cracked housing / iron. I still almost didn't find it.

The answer is FREEZE PLUGS. There are a couple of them behind the front cover.

You technically do not have to detension and tear the engine down to repair but you do have to remove the pan and front cover.
yes, the only way for water to get to the oil (besides leaking out of the engine, and then leaking back in, thru another seal) are the freeze plugs under the front cover.
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Old Apr 9, 2012 | 05:12 PM
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there are 4 of them under the front cover
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Old Apr 9, 2012 | 05:27 PM
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Here is what I think about leaky freeze plugs. That little bastard developed a pinhole leak and would only flood the oil pan when the cooling system pressurized.
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Old Apr 9, 2012 | 05:28 PM
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Originally Posted by stevensimon
there are 4 of them under the front cover
^^^ Two inside the cover, two outside the cover on the front iron.

At least on the FD.
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Old Apr 9, 2012 | 05:43 PM
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Originally Posted by 7dust
AH - I know this one! I tore my engine down three times looking for bad coolant seals or a cracked housing / iron. I still almost didn't find it.

The answer is FREEZE PLUGS. There are a couple of them behind the front cover.

You technically do not have to detension and tear the engine down to repair but you do have to remove the pan and front cover.
D'uh!!! I should've known, I kept forgetting about the other 2 plugs under the front cover. And the answer is so OBVIOUS. Thanks guys, now I just need to figure out if rust will be an issue, since the car sat for a couple years.
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Old Apr 9, 2012 | 08:37 PM
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Pull the pan and front cover off and have a lookie-see.
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