First, a little background:
I bought it new, 1998, 54" deck, powerflow bagger, and has the FD611V, liquid cooled, so it does NOT have the plastic cam gear.
I have maintained it regularly, and had a water pump replaced BY THE DEALER, about 2 months ago. It has been running fine, but in the past couple of weeks, there started to be some intermittent noise up front, that sounded like a rattle. I thought the PTO clutch mount bolts might have come lose, but there was no play in the bearings and the mounting bolts were fine. Also, the noise occurs with and without the PTO engaged.
I am afraid it may be coming from the engine, but don't know where/how to start looking for the problem.
Any tips or experience with this would be appreciated.
(I've posted on another forum, also)