I'm having trouble getting my 1990 oil filter housing to stop leaking. I've narrowed the leak down to the bottom right-hand bolt between the oil pressure gauge sender and the pressure relief valve we normally port. (Images for reference:
http://img836.imageshack.us/img836/2527/ofhlabled.gif and
http://dsmpartout.com/wp-content/uploads/wpsc/product_images/DSC_2433.jpg)
With a completely clean oil filter housing, I can see oil bubbling out of the head of this bolt when I start the motor. I have tried using black RTV to seal it with no success. I am now using Aviation Form-a-gasket on the bolt threads, and copper RTV near and on the bolt head. Any other suggestions for a good way to seal this?
I figure this is caused because something is cracked (but I haven't seen the crack), or that's just the way the G4CS block is. (I did notice that the bolt did have RTV on it when I removed it initially, and merely considered it odd as normally only the tensioner bolts need RTV.)
All other threads about leaking 1990 oil filter housings have been either a failed gasket (second gasket here with the same problem), or oil generated higher up on the block. As I can see the oil bubbling out from this bolt head I know that this is not my problem.
