Over revved engine, now breaking rockers

[shackwrrr]

Did a 2-3-2 shift this morning and it instantly started misfiring. Pulled the valve cover off to find #3 exhaust rocker snapped in half, and #3 intake rocker out. I put a spare pair of rockers in and it drove fine for a little while, I shut it off and it sat for about 4 hours. When I restarted it the engine ran great for about 30 seconds then started missfiring. Pulled valve cover again to ring #3 exhaust valve stuck open and rocker out. Popped valve closed with a screwdriver and reinstalled rocker, it lasted another 30 seconds then snapped the rocker again.

Cylinder head coming off Saturday but any guesses as to what happened?



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[cordes]

bent valves?

[OmniLuvr]

could have slightly bent a valve, not enough to misfire but enough to stick in the guide? when you over rev an engine the rods can stretch causing valve damage on an otherwise non interference engine? I have also seen pistons hit the head from over revving too... just a guess though, bummer dude...

[2.216VTurbo]

Bent pushrod?

[Vigo]

http://www.turbo-mopar.com/forums/sh...ght=valve+seat

[crusty shadow]

you have dropped a valve guide. had the same thing happen on a 2.2 when i let my gf drive it, she was afraid to use 4th or 5th ( dont ask me why) when driving in the snow and she drove the damn thing all the way home in 3rd gear. a valve guide had dropped causing the valve to bind and thus a broken rocker on that valve. the fact that you said the valve was stuck open pretty much confirms it.

[shackwrrr]

Well it seems that the valve took the brunt of the damage. There us some scoring in the guide but it's usable. I think the bronze guides prevented the guide from shattering.

[Vigo]

Impact marks on the piston?

[shackwrrr]

No impact marks. Looks like the bend is completely above the guide. I think when it floated and the rocker came off, it jammed between the cam then bent the valve.

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[Vigo]

Yeah, i guess i see that now that you mention it. First time i looked at it i didn't apply that level of logic to it... whoops.