Check River's mega 2T thread for a parts explosion of the timing chain tensioner. There is an 'O' ring at the end that seals the slotted adjustment screw inside the big hex outer nut. They usually perish.
http://toymods.net/forums/showthread...9&highlight=2T
Way down around post #16 are the pictures, cannot see them on my machine at work but somwhere there.
It is also possible that the main adjuster body has been over tightened into the head and cracked the seal there.
Regards
Rodger
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