Question About Head/ Valves

[starsthensun]

My buddy wanted me to post this for him since he is not a member of this site. He was torqing down the bolts on the flywheel while holding 2 wrenches on the cam gears to hold everything in place. He said he felt some slipping somewhere. When he finished tightening all the bolts he put a wrench on the crank to turn it over to check everything out, he said it went about half way around and locked up. The valves were hitting the pistons, so he took off the timing belt and retimed everything. when he puts the wrench on the crank and turns it over everything is fine. He was just wondering if any of the valves could have broke, or if it had just jumped timing. Everything seems fine now, but he doenst want to start the car until he knows for sure that nothing is broke. Please help us out. thanks a lot.

 

[Staytuned]

I can't see anything happening to the valves if you were turning the engine over by hand. It should be alright. Just make sure all marks line up now and go from there.

 

[groundPork]

Well, if he bent the valves, A leak down test'd tell you right away, actually the engine may not even fire up for lack of compression. Definitely do a leak down to check if the valves are sealing.

 

[1gcrazy]

Valves are pretty strong. They arent made of porcelain. If they were hitting and he was torquing on them pretty hard. My first guess would be that they are ok. If he took a hammer to the rachet or wrench then i'd double check everything with a leak down. If it were me. I'd just put everything back together and try and start it. If it doesn't start because of compression...you know where to start first right? Good luck with it all.

 

[starsthensun]

Thanks for all the advise guys. I checked out his motor today and everything seems to be fine. I re-timed the motor for him and turned it over a maybe a dozen times, everything is good i hope. i cant see the valves being messed up just from tightening the flywheel by hand, but i just wanted a second opinion to see if anything could have been messed up. What i dont understand is what was slipping when he was torqing his flywheel. anyone have any idea why it would just jump timing if he had wrenches on both the intake and exhaust cams? Could anyhting else be messed up from this? My guess is no, but im not a master mechanic yet. THanks for all the help. The more input i get, the better. thanks again.

 

[starsthensun]

one more question. If a valve was bent would i be able to tell just by putting a wrench on the cam and turning it? wouldnt it be slightly harder to turn?

 

[Staytuned]

No you couldn"t tell by doing that.