Just overhauled a D17 series 1 and am concerned about the oil pressure. The line to the dash gauge is so small that I don't trust that I am getting a good reading. I am thinking about installing a gauge on a fitting screwed into the 1/4 " drain plug at the bottom of the filter base. Will this give me a good reading? Manual says early D17 should have 12 psi but I don't know if mine is early or not. Where is the engine serial no located? Thanks for your input!
- Thread starter resden
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Aaron SEIA
Well-known Member
Assuming the original engine, yours is probably early. Does it use a PH8A filter or the old AC one with the tube up the middle? Tube up the middle would be early and 12 psi would be good.
AaronSEIA
AaronSEIA
Mr.Ferguson
Member
The unofficial series 1 machines, 57-60 if I remember right, don?t have great quantities of oil pressure, and 12 psi is ok for running.
Aaron SEIA
Well-known Member
Any chance you can snap a picture of the oil lines? I think the engine serial number is stamped behind the carb somewhere. Those numbers sound right for the early engine, but way low for the full pressure lube one. The early engine should have the 1/8" steel lines and the later one has much bigger ones.
AaronSEIA
AaronSEIA
Aaron SEIA
Well-known Member
Just re read your original post. I don't think there is a drain plug on the bottom of the filter base. Doesn't show in the parts book anyway.
AaronSEIA
AaronSEIA
Engines with the PH-8A style filter are to carry 30-35 psi oil pressure when throttled up. You can install a gauge right on the filter base where the dashboard oil line is. Some of those older tractors had the newer block installed in them and if that is true, there won't be an engine s/n stamped on the block behind the carb air hose inlet.
I have never ever seen a PH-8A oil filter on an engine with small oil lines. A picture would certainly help here. The PH-8A filter base is fed by two 3/8" lines and then a small oil line that goes up to the cylinder head and governor cover. If you have small oil lines feeding the filter base, then you must have a larger hex plug on the side of the block down by the engine oil dipstick ??? and if you remove the hex plug there is a coil spring inside of it ?? That is the oil pressure regulator, on the OLD STYLE oil filter system.
It does have the small oil lines and it also has the large cap at the dipstick for regulating the oil pressure. I installed a small washer in that cap to boost the pressure and will do another one to get more pressure. The question is should I replace that PH8A filter and base with the older system?"]
The old cotton string filter base dumped the oil back into the side of the engine block. So, there was one oil line going to the bottom of the base, up thru the small tube inside the filter. The oil then migrated thru the cotton string and exited out the back of the filter base into a hole in the side of the block. I suppose someone must have thought the newer PH8A filter paper was a finer micron than the cotton string and that's why they went to it ?? Anyway, I'm pretty sure the use of that PH8A filter would show LESS oil pressure than the cotton string filter. The pressure you are reading is the resistance of pushing oil thru the paper in the filter, not the actual oil pressure at the main and rod bearings. DID YOU REPLACE THE CAM BEARINGS YES OR NO ?? This is important because if the cam brgs are worn it greatly AFFECTS OIL PRESSURE.
Aaron SEIA
Well-known Member
None of this makes sense. The 2 filters cannot be threaded on the wrong base, the 2 lines are not interchangeable. I'm not seeing how this is going together.
AaronSEIA
AaronSEIA
The camshaft bearings were replaced. I do not know how to post pictures on this site. There is a small 1/8" tube that comes out of the block just above the large plug that regulates the pressure. This tube goes to a tee on the front side of the filter base. This tee feeds the filter and the other side sends oil up to the head where another tee splits the flow to the head and to the governor housing. I am going to search for an old style filter assembly from a WD45 or WD to put in place of the PH8A assembly!
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