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Tech & Fab
2004 GM 5.3 getting oil in radiator?
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<blockquote data-quote="grcthird" data-source="post: 582674" data-attributes="member: 1181"><p>With the exception being: a warm engine that is turned off has no oil pressure and still has coolant pressure, maybe just not enough coolant pressure to force it's way back through the cracked journal into the crank case. Sounds stupid but I have seen it, not on a 5.3 though.</p><p></p><p></p><p></p><p><a href="https://www.youtube.com/watch?v=9gKstTBLckM" target="_blank">https://www.youtube.com/watch?v=9gKstTBLckM</a></p><p></p><p>Pretty sure this is what you are talking about. And the leak won't show up sometimes unless it is torqued down, so the standard machine shop leak test using just block off plates in a dunk tank may not catch it. </p><p></p><p>If it's only happening on the side with the PCV then it may be sucking the coolant vapor in the intake.</p></blockquote><p></p>
[QUOTE="grcthird, post: 582674, member: 1181"] With the exception being: a warm engine that is turned off has no oil pressure and still has coolant pressure, maybe just not enough coolant pressure to force it's way back through the cracked journal into the crank case. Sounds stupid but I have seen it, not on a 5.3 though. [url=https://www.youtube.com/watch?v=9gKstTBLckM]https://www.youtube.com/watch?v=9gKstTBLckM[/url] Pretty sure this is what you are talking about. And the leak won't show up sometimes unless it is torqued down, so the standard machine shop leak test using just block off plates in a dunk tank may not catch it. If it's only happening on the side with the PCV then it may be sucking the coolant vapor in the intake. [/QUOTE]
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2004 GM 5.3 getting oil in radiator?
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