Testing for Leaking/Bent Valves
--Please Read-- :)
Some of the best advice I can offer you about fixing your car is to search for an online forum related to your car, or even for your specific engine. If you have a popular car or engine, this can be an amazing tool in diagnosing and fixing cars yourself!
1. Get kerosene, gasoline, or break cleaner.
2. Tilt head on its side, with the ports of the valves you're testing pointing up and exposed.
3. Fill the intake or Exhaust ports with the liquid you chose, make sure to use enough liquid to cover the back of the valve head completely inside the port.
4. Look at the valve surface in the combustion chamber for leakage. (Let it sit for several minutes)
5. If there is a leak, you could have a bent valve or just a bad seal of the valve to the head. You might have to replace the valve, or just use some lapping compound to lap the valve/seat to resurface.
6. Repeat for the other side if you wish.
7. This is a great time to replace valve seals if you have noticed they are worn too much.
8. If you have any questions, please post them here and I'll try to answer them quickly.
You just tilt the head on one side or the other depending whether you want to test the intake or Exhaust valves. I'm testing the intake valves in this video. I did this way because I didn't have the leakdown test equipment, but also because I wanted to replace my head gasket anyway. I wouldn't say this is the best way to test initially if you suspect leaking or bent valves because it requires you remove the head. Try just a regular leakdown test first. But if you're taking it off anyway it's pretty nifty and doesn't require the leakdown test tools. There are several methods to do this, this is just the one I chose in my situation.
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At-home Leaky Valve Test
To check if you have leaky valves, on the removed head, reinstall the sparkplugs, flip it over and fill with fuel. A bad valve will leaky quickly. It takes the valve on the right approx 2 minutes to leak all of the fuel. The one on the left had been tested 3 hrs earlier and was still full! That's what a good valve should do.
Sorry for the crappy quality but you get the idea.
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Leaking valve seals cause your engine to smoke when you first start it up, and then it usually runs the rest of the day with no smoke. Usually replacing the valve seals will fix the problem. Here's how to do it. Of course other engines may vary to some degree but the basics are the same.
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Valve job trick on a Citroen SM / Maserati 3 Liter engine...
A little trick that I learn on the internet some time ago. The lapping tool keeps slipping when the valve has carbon on it or the lapping compound oil get to vacuum cup. It is annoying, isnt it?
I hope this helps :o)
cylinder leak test how to check for bent valves
i did this video to help some of you not get ripped off when buying a motor.
i will be doing many videos of how to test parts and what to look for. please email me if you have question or what to learn how to test something else firstname.lastname@example.org or email@example.com