Why try to represent JT here? Why not represent AJ instead with a turn bet? This is one of the rare situations where you can actually get paid off with quads -- he's not going to put you on an 8, or 88, unless he's a weak-tighty who will have nightmares of 98. Given his flop call, the only hand he's probably worried about is 99, and if he has a decent ace he's not going to fold because of that.

It's possible he called on the flop w/not much hoping to bluff you off it on turn. So checking turn might get a bluff out of him which you'd lose if you bet. But this is highly doubtful on this flop, especially given his call of pot-sized bet led into PFR with 3 people left to act behind him. So he's got something he probably likes well enough, and will likely call you down. I'd say AQ is probable. He doesn't have a diamond flush draw, unless he's very aggressive preflop and has JdTd, which is doubtful (and if true, will also call or raise a turn bet). You've got a chance to stack him, or close to it. I'd bet 20 on turn, stick most of the rest in on river.