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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 05-17-2010   #1 (permalink)
Gary 69 mach I is offline Made Member


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Default What would make my oil dipstick come out of the tube?

I went down the highway about 20mi to a car cruise saturday night. Tonight i opend the hood and there was oil all over the underside of my hood and the oil dipstick was not in the tube. What would cause this? Thanks.
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Unread 05-17-2010   #2 (permalink)
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Excessive crank case pressure, so maybe a malfunctioning PCV valve or a bad ring or something along those lines.
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Unread 05-18-2010   #3 (permalink)
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+1 on excessive crank case pressure. Perhaps you have blowby?
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Unread 05-18-2010   #4 (permalink)
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How do i know if i have a malfunctioning pcv? Did you say bad ring? How do i check the blowby? Thanks guys.
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Unread 05-18-2010   #5 (permalink)
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You can test the rings with a compression tester. You need a friend. Remove one plug place the tester over the hole and crank the engine over. Record for all 8 cylinders. They shouldn't be to far away from each other in numbers. If you have a low one, squirt some oil towards the top of the piston and wait a few minutes for it to get to ring, then test the low cylinder again. If the compression improves more than a few pounds you have found you're bad ring.
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Unread 05-18-2010   #6 (permalink)
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I don't know if he put new rings in the rebuild but i would think he would know that. The engine was built in 07 but the car was not able to be driven untill april 09. I have put 3,279mi since rebuild. 3,279mi since april 09 i should say. Iv never performed a compression test before. Thanks for the help.
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Unread 05-18-2010   #7 (permalink)
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to get an accurate read on the compression testing remove all the plugs at once and then hold the throttle wide open for the cranking part, then compare the numbers of all the cylinders
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Unread 05-18-2010   #8 (permalink)
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to test the pcv valve shake and listen for a rattle, if none the get some carb cleaner and spary it till it rattles and is loose inside. Blow by will be evident if you remove the oil filler cap when it is running, you will get pressure coming out of the oil filler hole, r u sure you haqd the dipstick completely seated all the way in the tube after the last time you checked it?
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Unread 05-18-2010   #9 (permalink)
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The engine builder said he put in new rings. He also said the engine would smoke and use oil if the rings were bad. It does not do either one. He also said the rings may have not seated yet and i could have a cloged vacum hose. It has a holley 670 street avenger and i know the hose went in a different location then the old holley 650. I may have the pcv hose in a wrong port on the carb. When i checked the pcv valve it rattles and with the engine idleing it has no blowby but there is suction when i put my finger over the pvc valve while its running. Could there be blowby at high rmp like at highway speeds? The engine has only 3,279mi since the rebuild in 2007. Thanks everyone.
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