My armstrong pump is making a lot of rattling noise from teh middle bearing area (i have been adding the drops of oil 2 -3 times a season), and it is about 4 years old, pumps the water from my boiler to the rads in the house. could the bearing be shot already ?
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Kelea, if you do not hear a lot of engine rattling noises then I would say your "Oil Pump" is OK and you need to replace the "OIL SENDING UNIT" which you can buy at Autozone. CAUTION: If you do hear a lot of rattling noises coming from your engine then I'd suggest having someone check the oil pressure. If the oil pressure is low then it could be all kinds of things that can cause low pressures. From engine bearings, to restrictions, to the oil pump itself. I would start with the oil sending unit first and see what your oil pressure looks like. If your oil pressure is good after replacing the sending unit then I'd consider never taking my vehicle back to the shop that told you it was the pump. Hope this helps and have awesome day.
20lbs really is not enough to cause the lifters to make noise,the gauge maybe wrong The oil pump screen maybe stopped up,and the rod and main bearings maybe worn.If this was helpful,please rate,thank you.
I don't know too much about the oil pumps in the Twin Cam engines. I have never worked with one of them but I've got extensive experience with the older type pump used on the Shovelheads and Evolution engines.
A Harley engine employs a high volume low pressure oiling system. The old Shovelheads would actually show no oil pressure when idling hot with most gauges. The oil pressure switch would cut the light off at four pounds of oil pressure. A Harley engine will not hold a lot of oil pressure because the engine is built using roller bearings instead of shell bearings.
As long as the tappets are not rattling, you don't have a problem with oil pressure. If your oil pressure drops too low, the tappets are hydraulic and they will rattle like hell. There will be no doubt in your mind as to the problem.
Now, back to your question as to why the oil pressure on your bike drops when accelerating under a load, I have no idea.
a rod bearing makes noise when you are just barely pulling .. it likely will quiet down as you accelerate and decellerate .. you can rev the engine up a bit then let up on the gas just enough to keep that rpm ..a rod bearing will rattle a lot then ... if a thud like noise happens when you are accelerating . then it could be a main bearing .. if the noise is there all the time and sounds like a rattle then its more likely a valve problem .. old oil can cause the lifters to stick and rattle continuously .. if the noise you hear is a squeal then you could have a bad bearing in the idler pully (for fan belt) or alternator .. if thats the case you can put a drop of oil on the bearings one at a time until the squeal goes away .. that will identify which part is going bad .. there are other less likely bearings that can go bad .. like the cam, distributer, air compressor and water pump .. each have their own type noise ..
The oil pressure in an engine will naturally drop off as the engine warms up. If the oil pressure is dropping too much it could be cause by several things. I don't know how many miles your engine has on it but the oil pump may be getting weak and may need to be replaced. Worn out cam bearings or crank bearings can also cause low oil pressure. Sounds like your engine may be ready for a rebuild