Quote:
Craig wrote:
So, you are saying that the oil pump conversion worked, but that your problem all these years is that you have been mislead by "high enough" oil pressure indicator on the dash gauge, which really was not?
Craig
No.
The picture shows true Packard Oil Pump Pressure.
What I am saying is that the failed 1965 rebuilt motor used an NOS oil pump with all of the Packard updates and the illustration demonstrates 50 psi oil pressure at 2000 rpm using 10w-30 motor oil. The pump being used here is the low mileage NOS Packard pump.
However, somewhere along the line they put in a trick oil pressure sender because the gauge doesn't work with an OEM sending unit. The owner told me this car was always serviced by Packard / Studebaker dealers.
When I started the rebuilt motor the oil gauge barely moved even with 50 psi oil pressure.
So if people were thinking that there was an oil pressure problem based on the dashboard gauge and adding heavy oil to move the needle then they may have been damaging the oil pumps subsequently creating a true oil pressure problem.
So perhaps (back in the 1950's) when they put in the NOS Packard block they also installed a trick sender to make the gauge look good.
Sludging is another issue that would cause people to use heavy oil and exacerbate the problem.
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