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external scavenge filter collapsed


herky400M
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dear C-130 world, we experienced on a few of our T56-A-15 III engines collapsed external oil filters. it seemed to be collapsed but it could also be pushed/pressed together[ATTACH=CONFIG]4152[/ATTACH]

the filter has carbon particles and also show some shiny metal parts, but al in a small amount and this could not be the issue[ATTACH=CONFIG]4153[/ATTACH]

We still have to do the scavenge back_pressure test but meanwhlie any other options?:cool:

br Herky400M

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It is pretty impressive to see this kind of damage on the filter without the engine dumping oil overboard or venting internally. If this is caused by oil pressure, it is because the pressure going in is significantly more than the pressure coming out. There is a built-in bypass for this, so perhaps your bypass is ineffective or clogged, and someone "staked" the button to prevent it from indicating bypass. It would be best to wait for you to perform the scavenge backpressure test. Lockheed considers a pressure differential of 3-8 psi to be normal between the oil pressure going in and that coming out. The only other idea I have is to just blindly change the filter assemblies, to include the heads and bowls in order to eliminate all possibilities. You could also measure the length of the spring on the bottom of the filter and compare it to one that is not malfunctioning. Since it is happening to more than one engine, perhaps it is an error in installation, perhaps the cork gasket being installed incorrectly, or double-stacked.

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  • 2 weeks later...
  • 3 weeks later...

C-130 world, first results indicated that the oil cooler was the issue, changed the oil cooler, the results are even worse:(

we have a UAP fuel heater strainer, is it necessary to put in the self made testing tool (see service news V18N03) to obtain the correct readings?

thx 4 coop, herky

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