over reving?

 

Bend to failure or bow? They bend every time they open the valve, when they are overloaded they bend permanently.

 

A mechanical over rev can do it!

 

......AKA missin a gear

 

few different of things could cause it, excessive rocker ball or stud wear allows the rocker to slide sideways off the valve stem bending the pushrod. weak valve springs that allows the engine to enter valve float will also cause bent pushrods.

 

works everytime just about.

 

Valve lash, over revving, etc. But like everyone else has said, missing a gear is a really really quick way to do it

 

on the other hand too strong a spring will put excess stress on a stock like pushrod causing it to bend as well.

 

well...my stoopid tranny is all weird so it threw the gear from 3rd to 4th...SO I OVER REVVD IT AND FUCKED EVERYTHING UP

 

How could you tell if you had a bent pushrod?

 

umm well when u take it off and roll it on a flat surface it does roll smoothly

 

I have ticking comming from whatt seems like under the car. I pulled all my pushrods and checked over them and they all "seemed" fine. I didnt roll them I just looked at them and they looked straight. Could I have missed a very minor bend and would that minor bend still cause a loud ticking??

 

Exhaust leak or piston slap.

 

I fugured after checking everything it was an exhaust leak. I dont think its piston slap cause its so damn loud. If I have the wondows down and I drive next to another car or a curb or building, I can hear it over everything else thats going on...its rediculus. Can piston slap be that loud??

 

Sorry to hijack the thread by the way.

 

Mechanical over-rev (missed shift...usually trying for that nano-second 2-3 shift, and wind up stuffing back into 1st) will virtually guarantee a bent/broken pushrod. The PCM cannot control (pull fuel from cylinders) a mechanically-induced over-rev. The rev-limiter will work only if you're increasing revs via the throttle.

If you have an OEM valvetrain, the springs aren't strong enough to keep the lifters in contact with the cam lobes. Then you get valve float, and if you've over-reved at a high enough RPM, you'll probably smack your valves closed with your pistons. Then valvetrain parts wind up everywhere but where they're supposed to be.

Not to change the subject too much, I've seen the reverse lock-out fail on a missed 4-5 shift. That's a noise that'll make your sphincter pucker.....