alberta dave
Member
I am bringing my 1850 into the garage to change out a very weak Hydraulic pump. I have also noticed that the oil pressure is slowly dropping. It used to come right up to 40-45psi on the gauge and stay right around 40 all day long. Over the past year it has gotten lower and now drops from 35-40 after start up and then runs about 25-30 once its warmed up. Seems to me like bearings are getting a bit worn although it does not knock any worse than it ever has. I was thinking I might drop the pan and have a look at the bearings once its in the shop. I have had tractor for 20 years and only God knows how many hours are on the engine. I have no idea if anyone else touched the engine since 1967 when it left the factory.
Question 1 is: If the crank has been ground at some point will the bearings be stamped as oversized?
Question 2: Do the rod bearings or the main bearings make the oil pressure or is it both?
Question 3: Can you drop a piston out the bottom with the crank in place? No 1 cylinder always smokes bad. I changed the head gasket in the summer and the valves looked fine so I am thinking the rings are a bit worn on that cylinder. I changed fuel pumps and put a new injector in and nothing changed. An old English mechanic told me you can give these old Perkins sleeves a quick hone and slam new rings back in. I know I should have done this when I had the head off but only had a short rain delay between hay fields.
Question 1 is: If the crank has been ground at some point will the bearings be stamped as oversized?
Question 2: Do the rod bearings or the main bearings make the oil pressure or is it both?
Question 3: Can you drop a piston out the bottom with the crank in place? No 1 cylinder always smokes bad. I changed the head gasket in the summer and the valves looked fine so I am thinking the rings are a bit worn on that cylinder. I changed fuel pumps and put a new injector in and nothing changed. An old English mechanic told me you can give these old Perkins sleeves a quick hone and slam new rings back in. I know I should have done this when I had the head off but only had a short rain delay between hay fields.