Was a bit dicey a couple of times but finally got my cylinder head off. Was having a check engine light with a misfire on cylinder 7. The head gasket didn't look to have any leaks, the top of piston doesn't show any damage. Here is a picture of the valves, does this look like it might possibly be a burn valve?(The color on valve for cylinder 7 does look to be darker than rest of the valves). What would next steps be to diagnose if it is a valve issue?

Thanks in advance for any input!

 

Turn the head so the mating surface is level, chamber facing up. Fill it with water. See if it leaks out.

 

Are those plugs backed out(correct plugs)? Seem awful low in the holes.

 

Yeah, you are right. I didn't notice that right away.

 

Ok, cool, I'll try that. And yes, I backed the spark plugs out. I removed them all when I was rotating engine to align timing and just put them in part way after wards.

Was curious, Is this how a machine shop tests that valves are seated correctly after they do a valve job?

 

Yep.

 

That leak test worked great! The exhaust valve on cyl 7 is leaking real bad... water leaks out within a minute. Found I have slow leaks on intake number 5, and exhaust 1 and 3 cylinders.

Really disappointing, this rebuilt cate engine only has 40K miles on it.

What should I do next

 

Have a valve job done? Or, if it isn't too bad..... just

 

At this point simply lapping the valves won't help. And I don't care how few miles are on that "crate motor" as it is most likely a reman, meaning that they redid the heads and most likely ground the valves at that time. So they might have to be replaced this time. Idk about the 4.7, I typically try to avoid it. But in this case it don't matter what engine, if it's been redone it's hard to say what exactly was done while they were in there.
id send the heads (yeah both of them) to an engine machine shop and have a valve job done. As you saw every cylinder had some seepage in the valves how would you not think that the other head isn't the same shape

 

ugh... doing a quick search, looks like sending your head to a machine shop for a valve job is very expensive.

Bought a valve spring compressor tool online and it is on its way so I'll take out the valves out and inspect them. Can't help myself. haha. Yeah, I agree... if it was only one valve that was bad I would feel more comfortable not touching the other head but since there are 4 on this one the other head is probably the same. I seemed to be getting around 90 psi on a compression test on the cylinders (except for the bad one of course).

The first time I drove the car after the engine was replaced I noticed it didn't seem right. Ran a little rough and was hearing a little noise. Mechanic told me it may be fuel injectors and had me put in fuel injector cleaner. Wish I would have known then what I know now... would have pursued a new engine under warranty.

Thanks for your input guys!