Re: 1940 110 oil filter insyallation
Posted by 39SixSedanMan On 2013/9/2 19:56:14
The 40-46 six did not use a T block (see photo below). You'll see a pretty simple installation. However, there is a hidden benefit of using the T block if you don't know how your replacement.
The T block was primarily used for engines with Hydraulic Tappets (like the super 8) in conjunction with a special filter canister that had the letters HT or HYT stamped on the rim of the lid, standing for Hydraulic Tappets, which needed reliable pressure in order to maintain correct function; you never wanted to starve them. Also, those cars with an electric oil pressure sense gauge used the T block to mount the signal sender.
Now back to your 40: Your car did not have an electric gauge. The original Packard 40 junior filter canister has a blowoff pressure of 10 psi, which means that as the filter element becomes clogged, it creates backpressure. When this pressure becomes greater than 10 psi, a check valve opens, allowing oil to bypass the element and get on its way back into the engine. This way, the bearings, etc will not be starved due to a dirty filter.
Not all filter canister makers used the bypass function, or had the same blowoff pressure. If yours has no bypass and the filter became clogged (which would be really clogged) the filter would block the flow. So, without this, your choice is to be vigilant with your filter changes, or put in the T block with an orifice of sufficiently small size such that it forces some oil will through the filter.
Before I had a Packard filter, I had one with no bypass, but chose not to use a T block because I wanted all the oil to go through the filter. I also changed it every year....long before hit the recommended 2000 mile interval.
I hope this helps,
Pat
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The T block was primarily used for engines with Hydraulic Tappets (like the super 8) in conjunction with a special filter canister that had the letters HT or HYT stamped on the rim of the lid, standing for Hydraulic Tappets, which needed reliable pressure in order to maintain correct function; you never wanted to starve them. Also, those cars with an electric oil pressure sense gauge used the T block to mount the signal sender.
Now back to your 40: Your car did not have an electric gauge. The original Packard 40 junior filter canister has a blowoff pressure of 10 psi, which means that as the filter element becomes clogged, it creates backpressure. When this pressure becomes greater than 10 psi, a check valve opens, allowing oil to bypass the element and get on its way back into the engine. This way, the bearings, etc will not be starved due to a dirty filter.
Not all filter canister makers used the bypass function, or had the same blowoff pressure. If yours has no bypass and the filter became clogged (which would be really clogged) the filter would block the flow. So, without this, your choice is to be vigilant with your filter changes, or put in the T block with an orifice of sufficiently small size such that it forces some oil will through the filter.
Before I had a Packard filter, I had one with no bypass, but chose not to use a T block because I wanted all the oil to go through the filter. I also changed it every year....long before hit the recommended 2000 mile interval.
I hope this helps,
Pat
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