Hi guys Owen from Australia here I have just joined the forum as i require some help with the following rear main problem which is causing me a major headache and i am now at a loss as to why.
I own a 67 Tempest, which I have been restoring over the last few years, everything is going fine apart for my recently rebuilt 400, i brought the engine from the USA back in 2010 as it was almost impossible to source a 400 here. The guy i bought the engine off said it had been recently rebuilt, once it arrived i stripped it down and all checked out fine with a lot of goodies used
(I'm a qualified engine re-builder but have been out of the game for 10yrs).
Before putting the engine back together I the purchased a viton seal from BOP and installed it as per any other 2 piece seal i had previously. Engine goes in car seal leaks.
I then removed the engine and stripped it down again I then did some research to find that there were specific instructions for the seal installation which did not come with the seal. I then assembled the engine once again installing seal as per the instructions. Engine goes in again seal leaks.
Engine removed again, stripped down and thoroughly inspected, I didnt like the look of the bearings so sent the engine to a local re-builder who blue printed the crank, rods and block. He found front main tunnel out of alignment and clearances miles out so re-ground crank 20/20 re-sized rods.
I then put the engine back together this time using a rope seal as i had lost confidence in the BOP Viton seal. Engine went back in yesterday and guess what? Seal leaks.
I have rebuild 1000+ engines in my time and never had a seal leak like this. Does anyone have any ideas i am lost.