Burnt valve?

Question

is there a need to replace the whole engine when this has happened
This goes with my Mercury Tracer question.

Answer 1

For just a burnt valve? NO, it just requires a valve job, which could be replacing or just grinding.

Answer 2

Burnt Valve Cost

Answer 3

It depends on how the valve was burnt. If you forgot to add oil or do regular oil changes you might have other problems. If you over-reved your engine, again, the burnt valve might be the tip of the iceberg.

Normally a burnt valve can be fixed without replacing the engine. If your mechanic suggests replacing the engine, get a second opinion.

Answer 4

no.whoever said it was a burnt valve should have checked the spark plugs,and wires, first and then the timing...and then there is a possibility of a burnt valve..... do the other first...so many shops are bad about saying to you ,you have major damage,but it will be a minor thing........ and even if it is a burnt valve,you can repair them,and still have a good engine... when proper repairs are done........

Answer 5

Deeper down the rabbit hole we go....the short answer is of course no. A complete valve job for your current setup should run around $400. You could replace just 1 valve but it's not recommend and you'd be hard pressed to find a shop that would even consider doing it.

You also need to consider why that valve "burnt" in the first place. I doubt it's just coated in carbon, it's probably bent. If it's bent it means the piston head slammed into it and the cost to repair the motor would be more than replacing it.

Long story short you don't want to band-aid the problem....i.e. spend $400 for a valve job only to walk out a week later to hear the engine knocking from worn bearings. If you're committed to keeping it replace the motor (refer to your other post) if not try to find another vehicle that fits you well.

Answer 6

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RE:
Burnt valve?
is there a need to replace the whole engine when this has happened
This goes with my Mercury Tracer question.

Answer 7

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Usually a poor fuel/air mixture... running too lean etc... sometimes faulty timing can aggravate the issue as well. Exhaust problems are known to cause this issue in some cases... but so you know, there is a multitude of ways to burn a valve. FYI - Just replacing the valve will not fix the underlying issue... you will end up with the same problem. Once done, you need to start with your fuel and intake mixtures. - Good Luck!

Answer 8

I have a Bunt Valve on 2002 Jeep Liberty 4.0 do I replace the head or fix the valve

Answer 9

no need to replace the engine
all you need is other transportation for a little while and some money
the valve sits in the head the head sits on the block
that makes up the major part of your motor
take the head to a machine shop where they can re-machine the head and seat the valves
p.s. check the cost sometimes it cost more for the labor than the car is worth unless you have an attachment to that car !

Answer 10

It all depends on how many miles are on the enging. If you pull the head off then it is always worth wild to do a complete valve job. However in doing so that will "tighten" up the top end. By doing so, if you have a high mileage engine, you wind up burnig oil that will get past the rings. With todays engines I would consider a high mileage engine having over 90,000 miles on it. So over 90 rebuild the engine, under 90 it should be good enough to do just the head, providing the engine has had proper service in the past, such as oil changes every 3000 miles.