Top 2 Reasons Why Your Engine Valves Bent

Learn the causes of bent valves
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The videos on Motorcarnut channel are posted with informational purpose only.
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[@ivanvega2821]

Once again, your videos are superb! Keep them coming. You have educated me on a lot of stuff sir. Thanks! You should make a video on how to remove the valves and springs on a cylinder head and what tools you use!

[@motorcarnut]

Thanks, will do! And really appreciate your feedback!

[@nataliescott3606]

Hiya. This is greatly explained. I have a 2017 vw polo. My engine light has been on and off for 2 months and I’ve had new spark plugs, new ignition coils, the mafs has been cleaned as well as other parts. The engine light is still coming on and the car is rough when starting, engine misfires, acceleration hesitates etc. So would you say that the next thing to look into would be to see if it has sticky valves?

[@motorcarnut]

Yes, but also check for a bad fuel injector or valve timing being off.

[@mysterydude1]

A leaking exhaust or possibly leaking valve cover gasket could be the cause of these issues as well. From my experience 9 times out of 10, acceleration hesitation is most often due to a leak somewhere, either intake or exhaust. I would check for leaks before messing with the fuel pump/injectors.

[@motorcarnut]

Yes but on these vws valve timing is a big issue with misfires

[@jimdrechsel3611]

How can you determine bent valves without taking the head off? After adjusting preload I had some clatter that diminished and not I have a puff of blue smoke when hitting the throttle. Would there be popping up in the intake? Popping out the exhaust? Or can the bent valve be not bent enough to cause popping? Will a compression check confirm? Thanks for the video

[@motorcarnut]

Compression test or leak down test will let you know if it's a valve problem. Blue smoke won't really be cause by a bent valve.

[@jimdrechsel3611]

@ thank you. What can be the cause of puff of blue smoke on quick throttle? New engine here that I didn’t notice the smoke puffs till after replacing an oil pump that didn’t produce oil pressure which I think caused the roller lifters not to pump properly. Thank you for the reply

[@motorcarnut]

Usually it's from valve stem seals or piston rings but if they are new can be PCV valve too if that wasn't changed. But if the engine is completely new it has to break in so the piston rings properly seat, if not that will give the puff of smoke.

[@jimdrechsel3611]

@ I did a compression test and I know at least one cylinder is leaking compression. How can I tell if the oil and leak is coming just from the bent valve not a broken ring or cracked piston. I’m hoping the valve train is not damaged and I can get away with repairing the heads. Of course I will pull the heads but I can’t see the rings without removing the pistons and that really adds to the cost of repair

[@motorcarnut]

You can look at the spark plugs for oil residue and if its the one with low compression then its probably leaking passed the piston rings or there is mechanical damage to the piston itself. If the valve stem seals are new then it's not the valve causing the oil burning.

[@musclefactory9181]

Impressive I just learned this. I’m doing everything on my N20, you’re teaching me everyday 👍🏼 Thank you.

[@motorcarnut]

Awesome! Welcomes aboard! Thanks for all the feedback very much appreciated!

[@jessegarcia6654]

To the point thank you

[@motorcarnut]

You’re welcome!

[@ShennenYangis]

well explained..

[@motorcarnut]

Thank you!

[@jamesdoes576]

So can u explain to me how my valve got bent, no marks on piston, and is a push rod engine and everything in time

[@motorcarnut]

Overheating can distort the valves and the seats.

[@addkahaddkahaddkah7257]

Amazing 🎉thank you

[@motorcarnut]

No problem and appreciated!!!

[@DenfordTakawiraMashenjere]

I have Vauxhall 2.4 the timing chain broke and bent valve what would be the best solution to fix

[@motorcarnut]

Rebuild the head with new valves is the best and cheapest way if you’re doing it yourself.

[@jodytho]

Thank you for your well made, informative videos! I was hoping you might be abe to answer a question for me. My timing chain jumped on my 2012 Audi A4 B8 and bent the valves. During the process of the RR, could the oil intake/outlet pipes on the turbo have been damaged? When I got my car back from the mechanic, it started hemorrhaging oil! Thank you again.

[@motorcarnut]

Thank you for the comment, appreciated! Yes, if they did it sloppy the oil tube can be bent and then leak, absolutely.

[@jodytho]

thank you very much for your reply! @@motorcarnut

[@motorcarnut]

No problem, good luck!

[@motorcarnut]

@jodytho no problem

[@SunsyloSouvannaraj-rh6zm]

Question I changed the water pump and timing belt on my 2005 civic and the wouldn’t start due to the timing are off I redo it about 4 times do you think I value bent any one feel free to respond thank you 😀

[@motorcarnut]

It's possible. Just do a compression check on all cylinders. All should be pretty even in pressure and about 90PSI (cold)

[@SunsyloSouvannaraj-rh6zm]

@@motorcarnut okay thank you

[@motorcarnut]

@SunsyloSouvannaraj-rh6zm no problem

[@9993bhavish]

Hello bro had diesel poured in my audi a5 2lt tfsi and ive changed, throttle body, hpfp, 4 new spark plugs, coilovers were ok. After diagnostising again 2 cylinders not receiving compression. You think its the pistons or bent valves? Btw everything has been purged and new petrol re inserted already

[@motorcarnut]

To find out I would do a leak down test on those two cylinders. I have video on leak down testing if you don’t know have to do it.

[@christopherjohn944]

What if the valve is seated flush but not moving when you push on it

[@motorcarnut]

Well there is spring pressure, should move when pressed hard but by hand it’s harder or the valve may be bent slightly causing it to bind in the valve guide.

[@Artem-o7j8r]

I’m wanting a better understanding of what my engine is doing, I have a strange noise coming from the intake side. I could hear it through my air intake, is it possible I could send you a video somehow and you could take a listen and I could further explain what happened?

[@motorcarnut]

Yes post it on your KZbin channel and I’ll give a listen

[@giulecelectricalservices2311]

Hi, I’ve got a 351 is there a way to check the valves without stripping down the engine

[@motorcarnut]

Yes with a bore scope. I have a video on that if you want to check it out. They are cheap nowadays and a good option.

[@Yoickson]

Sometimes you can just look straight through the spark plug chambers and see if the piston dishes have dents in them. You’d notice exactly what you see in the video here, the pistons having one or two parts on them that are completely clean

[@MarkNewphone]

Look at the clearance between the top of the valves and the rockers.

[@motorcarnut]

@MarkNewphone True

[@KewanyaiDoster]

Could my valve be bent because milky oil keep getting into cylinder four

[@motorcarnut]

No but could have a blown head gasket

[@Alpha-cr5cb]

Gaskets

[@CodyWild-t8p]

Love it-

[@motorcarnut]

Thank you!

[@ChelseaKeary]

Why bent only 5 inlet valves. Are the spring the same for for exhaust and inlet

[@motorcarnut]

It’s because the intake valve are bigger and usually get hit first

[@frankieb2220]

Just Found out my 98' Toyota Rav4 2.0 L is a Non-Interference Engine.Yes!Good News I suppose.My Belt Timing Belt busted and I was like "SHIT.."😢(Already had the "Piston" inn Back of my Mind.

[@motorcarnut]

Yep most are, hopefully didn’t cause total destruction