merc 260 valve cover leak

[lukecono]

Hello, I have a newer small block (rebuilt from scratch) in my formula fs 3 but I have a minor issue. The valve cover on the port side is leaking from the back corner when engine is running. Has a 4 bolt pattern but to tighten that last bolt it seems inaccessible. Does the exhaust manifold come off or is there a handy tool to get between the valve cover and the manifold? 3 are accessible but of course the one that isn't is the loose one.

 

[alldodge]

It's either exhaust manifold of maybe 1/4 drive flex extension
https://www.amazon.com/Flexible-Socket-Extension-Adapter-Sockets/dp/B06Y3VXM3V

 

[kenny nunez]

You might have some luck with a 1/4”Drive 7/16” universal socket. You may find it at Lowe’s or maybe one of the tool truck salesman like Snap on.
Lay the valve cover upside down in a vise and tap down the area area of the holes. Wire wheel the gasket surface. Try to locate a valve cover gasket that has the slugs where the bolts go through made from silicone rubber.

 

[lukecono]

The valve cover is on the engine currently and in the water. Trying to avoid all of that hassle and have a tool that is skinny enough to tighten that bolt down because I don't see another way to access besides removing manifold. Ill see if lowes or a snap on has something I can get in there with. it's about enough room for a socket and even then, the weird angle makes any attachment difficult. the nut is tucked under that block and between valve cover and manifold.

 

[Bondo]

Ayuh,..... Welcome Aboard,...... Did you pull the ignition box outa the way,..??
You might have to lay the exhaust manifold out of the way,....

 

[lukecono]

Bondo- no I haven’t, gathering opinions before taking anything apart. The Ignition box would be easier then the manifold

 

[Scott Danforth]

make sure the valve covers are not distorted. the main reason chevy went from perimeter to center valve cover bolts is to prevent leaks

you may have to take a hammer and your work bench and straighten out the valve cover tinwork.