Here's what can happen to (but not limited to) your unsuspecting SR. With this SR, when the rocker arm went off track, it was pushed down on the retainer by the cam, knocked out the cotter, and bent the valve. (the bent valve was dicovered after disassembly.)
Here's another potential failure. Well, it's actually a failure, but it could've gone unnoticed for a while. One of the shims fell off. Luckily, it fell off down into the oil pan without causing catastrophic failure.
While we’re at it, here’s some more of the damage it can cause…
That’s about it for the rocker arm related damage for this motor… Here’s the good news for this particular SR20. The damage could’ve been much much worse. Not just in the head, but upon disassembly, we found that this SR had much deep-seated issues. Here’s the picture of the piston. As you can see, the piston’s ring land’s trying to come off. Well, it did come off, but the way it broke loose allowed the piston rings to keep the loose piece in place without a single scratch on the cylinder wall.
Considering that the loose piece could've come off and caused irreparable damage to the block, this guy was really lucky that the rocker arm fell off when it did.
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