92 century valve cover and engine rattle?

[mission]

Do either of the valve cover gasket replacements on a 92 3.3 involve disrupting an engine mount, bracket, or "lift"? Trying to see if a replacement somehow caused a rattle that sounds/feels like bad motor mount at almost stopping speed... thanks

 

[CorvairGeek]

You do end up with the "dog bone" removed for the front valve cover. I think I might have removed (or at least loosened) the entire bracket over the valve cover too. That combination could be assembled so it is transmitting more vibration, but I wouldn't expect so.
The rear cover is very easy and requires little disassembly. Surprisingly, I don't have a picture.
The only thing I can think of is if someone (mistakenly) tried to "ratchet strap" the engine forward for the rear valve cover, and damaged a mount.
With that said, both of the transmission mounts were broken, as well as the "dog bone" very worn on my '92 3300 and it felt no different after I replaced them. My '96 3100 had the motor mount (crankshaft pulley end of the engine) fail and it felt no different after replaced either.

 

[mission]

You do end up with the "dog bone" removed for the front valve cover. I think I might have removed (or at least loosened) the entire bracket over the valve cover too. That combination could be assembled so it is transmitting more vibration, but I wouldn't expect so.
The rear cover is very easy and requires little disassembly. Surprisingly, I don't have a picture.
The only thing I can think of is if someone (mistakenly) tried to "ratchet strap" the engine forward for the rear valve cover, and damaged a mount.
With that said, both of the transmission mounts were broken, as well as the "dog bone" very worn on my '92 3300 and it felt no different after I replaced them. My '96 3100 had the motor mount (crankshaft pulley end of the engine) fail and it felt no different after replaced

Interesting where that mount is located on this engine. Thank you for quickly replying! This helps greatly.