2006 Avalon 56,000mi Automatic

Hi Scotty, 

I wondered if there are any good videos that go step by step into partial 1mz-fe engine teardowns for top down valve seal replacements.  It seems that the problem is one cylinder where the plug is fouled.  I don't know if all seals would be badly aged, or if direct application of a polymer could rejuvenate undamaged ones.  The task is getting thru all the timing belt - crankshaft stuff and putting it all back together. The reason for it costing so much to have done.

There's a product called Forte.  I wondered if it has been tested - if it could be dripped down around the valve spring retainers under the camshafts with only the valve covers removed.   I've already tried using AT205 and Barrs Valve seal repair added to the oil with no improvement.  So I've figured Forte wouldn't do any better.  https://www.ebay.com/itm/Forte-Seal-Conditioner-125ml-4-40oz-/223468568279

Thanks!