cleaning the block
Fleet Owner
Joined: Nov 2003
Posts: 27,924
Likes: 3,644
The oil filter bypass activates off of differential pressure across the filter, ie when "P(in) - P(out)" is greater than or equal to 20 psi.
That filter may be restricted or it may not.
75 psi is where the LPOP regulator is set to hold pressure.
That filter may be restricted or it may not.
75 psi is where the LPOP regulator is set to hold pressure.
Hotshot
Joined: Dec 2014
Posts: 17,834
Likes: 3,127
From: Jersey Shore
Hartwig, you are probably the only tinkerer who would come up with a way to check this without the potential of putting filter media into the HPOP. But you would need a pump capable of the same volume as the OE LPOP in a test stand. But then there is the variability of oil and temperature. Not that I proposing you do that. That's a lot of time, effort, and materials to test a speculation.
I unfortunately only checked my engine's oil pressure for a day before putting the sensor back on the fuel cap. This is incredible since I usually put oil pressure gauges on everything I drive. That's changed. The 70 psi is right at the LPOP regulators limit, as others have reported with their trucks. So the flow is restricted upstream at that condition. The HPOP is dumping to maintain an idle-based injection oil pressure, a significant leak at the other end of the oil path, so it is pulling through a good amount of oil. This is a unique situation in typical automotive engine terms, gas or diesel.
Again, for me the evidence that the oil filter is getting bypassed is the debris found on the HPOP screen. And it's not just me.
I unfortunately only checked my engine's oil pressure for a day before putting the sensor back on the fuel cap. This is incredible since I usually put oil pressure gauges on everything I drive. That's changed. The 70 psi is right at the LPOP regulators limit, as others have reported with their trucks. So the flow is restricted upstream at that condition. The HPOP is dumping to maintain an idle-based injection oil pressure, a significant leak at the other end of the oil path, so it is pulling through a good amount of oil. This is a unique situation in typical automotive engine terms, gas or diesel.
Again, for me the evidence that the oil filter is getting bypassed is the debris found on the HPOP screen. And it's not just me.
Cargo Master
Joined: Oct 2018
Posts: 2,811
Likes: 1,911
From: unfortunately Germany
An idea that is not without danger, however:
We check the oil pressure as in my video. Then block the bypass of the oil filter, install a bypass (safety valve) in the oil filter cap so that no damage can occur to the engine. Now we repeat the oil pressure test. If the value of the oil pressure is now higher (with blocked bypass valve), this confirms the assumption that oil gets past the filter into the engine.
We check the oil pressure as in my video. Then block the bypass of the oil filter, install a bypass (safety valve) in the oil filter cap so that no damage can occur to the engine. Now we repeat the oil pressure test. If the value of the oil pressure is now higher (with blocked bypass valve), this confirms the assumption that oil gets past the filter into the engine.
Hotshot
Joined: Dec 2014
Posts: 17,834
Likes: 3,127
From: Jersey Shore
The damage would be the filter media getting to the HPOP. If fibers, it can make it though the HPOP screen. I believe when Bill found the filter blown out of the bedding compound, later on he had injector issues. I not going to hunt for his old posts to confirm that.
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