No oil in oil filter
02-05-08, 07:38 AM
#31
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" When a collapsed center tube or element is discovered, the natural tendency is to assume something is wrong with the filter (Fig. 1). This is not the case, but is a symptom of problems with internal engine components.
Most engines incorporate within the oiling system a by-pass valve across the inlet and outlet of the full flow oil filter. The valve is designed to open and by-pass oil around the filter and/or element when the restriction reaches its opening pressure (Fig. 2). The by-pass flow circuit insures oil flow to the engine when there is a significant restriction across the filter due to plugging or cold start conditions. Typically, engine manufacturers design by-pass valves to open at a pressure differential of approximately 10 to 30 psid with some as low as 4 psid (28 kPad), with some opening as high as 75 psid (500 kPad). Some engine manufacturers have the by-pass valve located in the filter mounting base on the engine, while others locate the valve in the filter. Either way, the same purpose is served."
Most engines incorporate within the oiling system a by-pass valve across the inlet and outlet of the full flow oil filter. The valve is designed to open and by-pass oil around the filter and/or element when the restriction reaches its opening pressure (Fig. 2). The by-pass flow circuit insures oil flow to the engine when there is a significant restriction across the filter due to plugging or cold start conditions. Typically, engine manufacturers design by-pass valves to open at a pressure differential of approximately 10 to 30 psid with some as low as 4 psid (28 kPad), with some opening as high as 75 psid (500 kPad). Some engine manufacturers have the by-pass valve located in the filter mounting base on the engine, while others locate the valve in the filter. Either way, the same purpose is served."
if the relief valve in the motor hangs up or fails the filter sees all the pressure that is generated and has zero ability to bleed it off in any way.
there is no relief system in in the filter assy sytem at all. some filter have a war emergency bypass that allow minimal flow if the media is completey clogged , at which point it is academic anyway , but thats not the issue.
there is no relief system in in the filter assy sytem at all. some filter have a war emergency bypass that allow minimal flow if the media is completey clogged , at which point it is academic anyway , but thats not the issue.
True, there is nothing to cause the oil to completely bypass the filter cannister, but it will bypass the filter media. (paper or synthetic) Compare the size of the oulet tube to the bypass valve, that is full flow not an emergency trickle. This bleeds pressure off the filter media to keep the tube from collapsing and oil flowing. If the engines oil galleys are clogged, there is nowhere for the oil to go and bypassing the filter media would not help. It would not collapse the tube because the pressure would be the same on both sides of it.
Show me an engine that has a pressure bypass to return oil to the pan instead of the engine, and I'll show you an engine that will burn up the first time the owner misses an oil change.
/waves BS flag None, not one ever. Come on!!! Every, Every, Every!!! manufacturing process makes defective units.
Oil filter failure modes, just off the top of my head:
Leaking seals - oil running down block
leaking pressure bypass- causes oil to constantly bypass filter, reduce filtration
leaking media - reduced filtration
bypass stuck shut - could cause canister to explode, or outlet tube to crush or both, if media becomes clogged.
They might not all explode, but out of all the oil filters made there have been plenty that don't do what they were supposed too.
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