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Old 03-11-2007, 02:54 PM
Mercurymarc
 
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Coolant Drip/Milky Oil/Good Compression

I have searched the archives and found several helpful threads but still need your help. I rebuilt my 1969 Ford 250 Straight Six 15 months ago and have a persistant tiny coolant leak on the right front of the block- looks like it is from the head-block seam near the front (#1). Also my oil looks like chocolate milk. Runs a little rough but not too bad, doesn't burn oil. Compression tested today- good results (162-180 PSI). I would prefer not to to pull the head (just yet anyway) but I think I have gasket leak between the coolant passage and oil passage and also a leak through the gasket to the block-head junction. (I probably should have had at least the head checked and milled flat before I slapped it together...).

Wondering if any cures in a bottle might work?

Thanks!!

Marc in SF
1963 Mercury Comet Ragtop w/1969 I6 250
http://mercurycomet.net

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Old 03-11-2007, 03:12 PM
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if you ran the engine any amount of time with chocolate milk oil, the bearings are probably shot now
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Old 03-11-2007, 06:31 PM
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Ouch! What if the oil looked more like a rootbeer float; more like amber-brown fluild with a brownish thick tint, not entirely transparent?
Thanks
Marc in SF
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Old 03-11-2007, 07:02 PM
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If it doesn't look like motor oil, it's time to tear it down, fix the problem, and change the bearings before the engine gets some unrepairable damage.
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Old 03-11-2007, 07:07 PM
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Coolant has been mixing with the oil, as you suspected.........Most likely the head gasket. Not hard to change on a six. Like said, you have to wonder if the bearings have been damaged?

As Clint Eastwood says....."Do you feel lucky?"

I would pull the pan.
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Old 03-11-2007, 08:14 PM
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I would suspect a possible intake gasket failure. Either way, you're going to have to first inspect your bearings to see if they need to be replaced.
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Old 03-11-2007, 08:20 PM
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Yeppers...it sounds like a leaking head gasket....antifreeze does not do bearings anygood either. I think you should replace the head gasket and its gonna be a gamble if you don't change the engine bearings...I believe I would change them.
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Old 03-11-2007, 09:15 PM
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And as you said yourself, have the head and deck surfaces checked to make sure thay're flat.

Bill
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