Posted by UP Oliver on June 27, 2016 at 10:24:39 from (68.70.134.87):
I had put a message out there a couple times about my DB 990 having problems. If you search "David Brown 990 don't run good" or "David Brown 990 Injection pump" you can read all about it. Dieseltech suggested a blown head gasket and he was correct. I took the head off a couple days ago and there it was, a piece missing between two cylinders. I am very thankful for his input and everyone else that provided information.
Right now I am hung up on adjusting the valves. The manual talks about some timing peg in the flywheel for TDC, I have no idea how to access my flywheel without splitting the tractor. Right now I have the head on, the lift rods in and the rocker arm assembly bolted back in with the valve cover off. I am watching the valves move and I have my manual there, but I don't really know for sure when that first cylinder is at TDC like the manual mentions. I feel like skipping this step since all I did was take the head off and let it hang there for a few minutes while I took the old gasket out and put the new one in. I feel like I might do more harm than good.
Any advice on when I am at TDC on cylinder number one with the situation I have would be appreciated.
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