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Stuck valves

I decided to do a leak down test on my spare motor that's been sitting for a couple of years. All tested perfect except #3 cylinder. I have the upper

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Old 03-12-2021, 05:17 PM   #1 (permalink)
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Default Stuck valves

I decided to do a leak down test on my spare motor that's been sitting for a couple of years. All tested perfect except #3 cylinder. I have the upper intake removed but the lower is still on. When I pressurized number #3, air was pouring out of the #3 intake runner. Ok, stuck intake valve. I sprayed wd40 down the runner onto the stems and seats and turned the engine over by hand a bunch of times. I reinstalled the leak down tester and it appears I freed up the intake valve because now I can hear it coming out of the exhaust port It must have been stuck open a little bit but I couldn't hear it before because the intake valve was stuck open more. I sprayed the exhaust valve stems and seats and turned it over again but so far it hasn't freed it up. I'll let it soak for a while but does anyone know of a better penetraring oil or a good way free up the stuck valves without pulling the valve cover or head?
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Old 03-12-2021, 06:58 PM   #2 (permalink)
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Pb Blaster.


Or try some of that Blue Waffle juice.
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Old 03-12-2021, 07:23 PM   #3 (permalink)
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Quote:
Originally Posted by Rusty View Post
Pb Blaster.


Or try some of that Blue Waffle juice.
I'll try the PB Blaster, I'm saving the blue waffle juice for Rusty's kokfest
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Old 03-23-2021, 08:18 AM   #4 (permalink)
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Pop off the valve cover and have a quick look for the gap between the valve bucket and cam lobe/VVEL slider.

I assume the engine is out of the car, and with the upper intake off, it should be fairly quick to remove it.
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