Valve/motor diagnosis

[DueyT]

Dave, that stinks! At least this was a "fail-safe" mode, as opposed to a "fail-in-the-worst-and-most-expensive-way-possible" mode!

As those rockers aluminum? If they were ductile iron I'd recommend getting the set magnafluxed to check for cracks and if OK, just replace #1 cyl. If they're aluminum, I don't think magnafluxing works...I'd consider careful inspection and likely replacing them all.

Not positive, but I suspect the valve lash may have been off...

[John B.]

Before you replace them it would be nice to figure out why both rockers on the same cylinder let go. It seems unlikely that both rockers were faulty.