5.7 Chevy 350 water in engine oil

[jwvlaar]

After cooling water leakedge at the thermostate house the engine was overheated. Now one week later the engine lost power. I checked the oil end there is water in it. At bottom of oil pan and visible at inside valve cover.<br />What is most likely the problem?<br />leaking cilinderhead gasket / leaking exhaust elbow / broken exhaust manifold / cilinderhead damaged? Someone any suggestions?

 

[magster65]

Re: 5.7 Chevy 350 water in engine oil

It could be a number of things but it sounds like the riser(s) maybe. It's difficult to do a good diagnosis with so little info. Pressure test your cooling system if it's FWC. If it's RWC pull your riser(s) and look for water in the manifold(s). This would be 'best case' scenario, if it's not the exhaust you have some work ahead of you.

 

[crazy charlie]

Re: 5.7 Chevy 350 water in engine oil

Did you do an oil change after the initial water leakage????????Charlie

 

[akriverrat]

Re: 5.7 Chevy 350 water in engine oil

how bad was the corrosion in the tstat housing and water passage under tstat? intake might have cracked or rusted through.

 

[jwvlaar]

Re: 5.7 Chevy 350 water in engine oil

There is no thermst.housing or cooling problem. It was just a hose stop blown of which caused the overheating. I checked oil few days before overheating and lub oil OK (no milky oil)<br /><br />I'm going to dismount the intake- and exhaust manifolds and the cilinderheads to check for cracks or blown cilinderhead gaskets.