how to tell bent valves?

[1fast97gsx]

Can you tell if you bent any valves by looking at the rockers while spinning the cams? My belt jumped a few teeth on start up and the car idled horribly and then died out. I pulled the valve cover, but don't want to pull the head. Thanks.

 

[BoostedTalonTS]

Timing belt installed (correctly):
Do a compression and/or a leak-down test

Timing belet NOT installed:
Like you were saying... Manually rotate your cam lobes AWAY from the rollers (for each cylinder, intake and exhaust cams) and see if you have any play inbetween the roller and the valve stem... Any movement other than a little side-to-side is a bad thing (as it means that the valve isn't fully seating because it is bent and it isn't applying the full pressure back on the roller.

Another low tech way would to be to use a pinlight (really small flash light) to shine light in through the spark plug holes and look for 2 fresh new shinney marks on the piston heads.

 

[chriseclipse]

when i bent the valves my car it wouldn't start and when it did it made a very loud ticking noise. when i took my valve cover off, i noticed that the rollers were not touching the cams. here is a picture of it

 

[kalla]

when i bent the valves my car it wouldn't start and when it did it made a very loud ticking noise. when i took my valve cover off, i noticed that the rollers were not touching the cams. here is a picture of it

Yep, that roller sure isn't touching a cam, or anything else for that matter

 

[BoostedTalonTS]

Yep, that roller sure isn't touching a cam, or anything else for that matter

:laugh: :laugh: :laugh: That's FUNNY!!!!! :laugh: :laugh: :laugh:




-You were supposed to check it for play INSIDE the head.

Sorry to say that it looks like you need some new valves man.

If you're going to be looking for another head, try these guys:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33617&item=7931298800&rd=1

You can get either a stock reworked head or a ported Stage1 head...I got an awesome ported head by them

 

[Awdboost]

Compression test will let you know how healthy the motor is. Try that first, then if you have weird readings do a leak test.

Mike

 

[1fast97gsx]

Thanks guys. I'll let you know what all I find out tonight. Rockers were tight and cams were off by about 3 teeth. We'll see.

 

[1fast97gsx]

so I took off the timing belt and found my problem. My tensioner pulley was literally touching the tensioner arm and therefor not turning with the belt. I don't know if I got sent the wrong pulley or what, but that has to be what caused my timing to jump since I've done 3-4 timing belts and never had any problems at all. I took off the arm and grinded off a little bit of material and the pulley spins awesome now. I put the belt back on and rotated everything to see if it feels smooth. I don't have any binding and the rockers are fine so I will try and start it in a few minutes.

 

[1fast97gsx]

well I didn't start it up yet since I figured I might as well check compression first. To my surprise my compression came out nearly perfect. I got 183, 187, 182, 185. This is on a cold motor with only 10 miles on it. Yea ... literally 10 miles. I modified the tensioner arm so now the pulley spins freely and everything seems ok. I was out of time by at least 3 teeth, however it appears I have no bent valves. Maybe the extra large valve reliefs in the wisecos saved me? Oh well thanks for your help guys and I'll try and start it tomorrow.