Bent Valve / Pulled Stud
Posted: Tue Oct 10, 2017 9:58 pm
I was driving home from work yesterday and when close to home I accelerated away from a light and rev'd the engine up (tach said about 5500 but it is not trustworthy), a heard something funny then the engine sounded like it was missing. I pushed the clutch and it idled, but rough. I limped the mile home and it sounded like one cylinder was huffing air. Today after work I pulled the rocker cover off and noticed right away that the #1 cylinder exhaust rocker was really loose (valve clearance was 1/4 inch maybe). The intake valve was compressed (open) on the intake stroke. On further inspection I noted that the #1 cylinder rocker tower was loose. The nut that holds it down was loose, but it looked like the normal amount of threads sticking out the end. I pulled the rocker arms/towers assembly off the head and saw that the #1 cylinder rocker tower stud was threaded out about 3/8 inch. In reality I think the cylinder hit the valve and it jacked the rocker arm up and pulled the tower stud out of the head. Is this possible? Is this repairable? It's an aluminum head, R16. Any suggestions on what to do would be appreciated. I haven't pulled the head off yet. In the picture below you can see the exposed threads of the stud in the red box.
Thanks,
Rustbucket
Edit: I just pulled the stud out. It looks like it has a helicoil or something. I've attached a picture of the stud hole and the stud end with the coil.
Thanks,
Rustbucket
Edit: I just pulled the stud out. It looks like it has a helicoil or something. I've attached a picture of the stud hole and the stud end with the coil.