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Old 05-10-2017, 04:01 PM   #1
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Default Oil and water mixing mercruiser 4.3 v6 (190) mil

Hey guys I have cream paste in the head of my mercruiser 4.3 v6 (190) vortec but not mixing in the sump I'm thinking head gasket but looking for a second oppion
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Old 05-10-2017, 04:08 PM   #2
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What is your operating engine temp? I had this happen on an engine where the thermostat was stuck open and the engine was running ice cold. It wasn't hot enough to vaporize combustion blowby and the moisture was condensing in the valve cover breathers. No evidence of water in the oil pan. Changed the thermostat and it was all better.

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Old 05-10-2017, 04:17 PM   #3
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I just replaced both thermostats and they operate at 160 degree and when engines are operating they sit at 175 degree on both engines
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Old 05-10-2017, 05:07 PM   #4
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Default Mercruiser 4.3 oil mixing

Rocker cover off and showing mixing but not mixing in sump
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Old 05-10-2017, 05:29 PM   #5
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Not good!

The return passages are blocked so nothing getting back to the pan. Do both sides look this way?
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Old 05-10-2017, 05:30 PM   #6
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BTY a blown headgasket will result in low power and the goo in the pan as well. Have you pulled the spark plugs to look for water in the cylinders?
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Old 05-10-2017, 05:45 PM   #7
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Yae both sides
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Old 05-10-2017, 05:46 PM   #8
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Nope haven't checked spark plugs yet
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Old 05-10-2017, 07:00 PM   #9
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Pull the plugs to check for water. Pressure test the engine by removing the t-stat hoses and blocking them off and one having a fitting to install a air pressure gauge and fill valve. Add 8 psi of air and let it sit to see if it hold pressure not.

Rubber hose and PVC piping and caps are a good way to do this.
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Old 05-10-2017, 10:30 PM   #10
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BTY the oil system is connected throughout the engine so these is goo in the pan as well. Are you seeing clean oil on the dipstick? Has the volume increased above the full line?
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