Bent valves?

[CManT1914]

One of my friend's mechanic came by today, and so we had him look at my engine to see if he could figure anything out. He set the rockers and checked the compression, and said that either one of two things probably happened:

1) I bent the valves by tightening the rockers too much
or
2) I got the cam timed wrong

I'm pretty sure I got the cam timed right. I put on a new timing chain and sprocket and lined it up dot to dot. So I don't see how the cam could possibly off that much to make it run like crap. You guys think I bent some valves?

 

[Killercanary]

Easy way to tell is remove the rockers and spark plug, then hook up a fitting that will screw into the head and pressurize it with air. If you hear it coming out of the intake you bent the intake valaves, if you hear it coming out of the exhaust you have bent exhaust valves... I did this to mine after I over-rev'd it at the track and sure enough I could hear it coming from the exhaust. I had to put a good bit of air into it before I could audibly hear it though JFYI.

 

[CManT1914]

The mechanic is coming back to do a leakdown test for me to see if my valves are bent.

 

[5.0_GT_kid]

Hoping for the best buddy...good luck on it.

 

[HISSIN50]

Sounds good Chris. Paul's advice is spot on .

Good luck. BTW, are you sure your pushrods are adjusted right and not hanging the valve open? (I have not checked your other threads yet).

Good luck bud.

 

[RIO5.0]

That would suck if the valves are all bent... undo the coil...Pull all the plugs...take #1 plug and stick your finger in there... and have someone turn it over....get a feel for how much compression it has... now go to that cylinder and lossen the rockers...Do the test again...same??? or more compression??? more would say your valves were hanging open...Its a homey test but may answer your question quickly?? or better yet, plug a pressure gage into that cylinder and do it....you should see instant results...
Either way good luck with it....

 

[CManT1914]

That would suck if the valves are all bent... undo the coil...Pull all the plugs...take #1 plug and stick your finger in there... and have someone turn it over....get a feel for how much compression it has... now go to that cylinder and lossen the rockers...Do the test again...same??? or more compression??? more would say your valves were hanging open...Its a homey test but may answer your question quickly?? or better yet, plug a pressure gage into that cylinder and do it....you should see instant results...
Either way good luck with it....

Did a compression test today. I got 135 across the board, loosened the rockers and relashed them and got around 145-150 across. I don't think my valves are bent, as everybody's telling me this is a good number for a 110k miles motor.

On a side note, DAMN THAT COIL SPARKS!!!