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  #1  
Old 11-20-2015, 06:48 PM
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olds45512 olds45512 is offline
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Default PSA oil lines
since my hour meter didn't work on my 1811 i replaced it with an oil pressure gauge and it read about 55psi at an idle an a little more at wot, one of my oil lines running to the filter leaked a bit so i had a new set made at a local hydraulic shop and when i put the new lines on the pressure gauge now reads 40psi at an idle and 45psi at wot. i was curious to find out how i could lose 15psi in oil pressure just buy changing the lines and it turns out that one of the old lines was collapsed on the inside which caused restriction and bumped up the oil pressure. i was just sharing this bit of info with the group because most of you just have the idiot light and not a gauge, if the lines restricted the engine is starving for oil so even if your lines dont leak it might be a good idea to have some new ones made and solve the problem before it potentially ruins an engine.
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Old 11-20-2015, 07:17 PM
R Bedell R Bedell is offline
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The inside diameter of the tubing determines the pressure. The larger the diameter, the less pressure and vice versa.
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Old 11-20-2015, 07:35 PM
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The inside diameter of the tubing determines the pressure. The larger the diameter, the less pressure and vice versa.
yes thats exactly my point, had i not had a leak id still be running the lines and starving the engine for oil. i just figured id post this up because im sure there are plenty of cubs out there that have the original lines on them and even though there not leaking they still might be doing harm to the engine.
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Old 11-20-2015, 07:59 PM
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Thanks for the tip. You are correct. I will put that on my long todo list.
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Old 11-20-2015, 09:11 PM
J-Mech J-Mech is offline
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Oil pressure switch is after the filter. Not sure how that replacing the lines would have made any difference? Unless you have the switch mounted in a different spot?
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Old 11-20-2015, 09:20 PM
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Oil pressure switch is after the filter. Not sure how that replacing the lines would have made any difference? Unless you have the switch mounted in a different spot?
i have the mechanical oil gauge in the same location as the sender for the idiot light, i though it was weird to so i switched the lines back and it went back to 55psi and that's when i decided to blow air through the lines and one of the originals had a lot of restriction.
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Old 11-20-2015, 09:46 PM
J-Mech J-Mech is offline
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Interesting....

Only thing I am not sure of is if the oil pressure regulator bypasses the filter, or just dumps into the pan. On most any and all engines, it dumps to the pan. It may just bypass the filter on this engine. If so, it still seems odd that the oil pressure raises... it's still the same amount of oil. I don't see a filter bypass in the system.

Run a test Tim. Go take the filter line base plate off and block it. See if it still has oil pressure, and how much.

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