Oil filters. Help!

[CalicoJack]

I was told that the oil filter (Fram PH8A) that I was using on my Perkins 4108 was not suitable as it was mounted so that it would empty when the engine was switched off, as it did not have an anti drain back device fitted. I contacted In-Line Filters who were most helpful and confirmed this and recommended a suitable filter as a replacement. My problem is that I can see no difference between the two. In the photographs the one with the orange rim is the old Fram, whilst the other one is the new one (Baldwin FFR-PH2821). Both have a rubber seal inside the filter, under the smaller holes that run around the circumference of the filter. These I believe are the anti drain back device. I have fitted the new Baldwin filter and there seems to be no change in its performance, when the engine is started oil pressure is still slow to come up and then settles at 55lbs per square inch after perhaps ten seconds.

Can you tell me, do I now have the right filter? Do the Baldwins and the Fram both have an anti drain back device, and if so why was the Fram not suitable?

 

[RichardS]

The photo is not clear but if they both have the rubber flap then they must surely both be non-draining?

I would push a short piece of garden hose or similar into the middle and then suck and blow as hard as you can. You should be able to tell whether they both behave in the same way.

Richard

 

[Trundlebug]

Have a look inside the filter, down the centre hole at the bottom.
If you can see a valve type thing with a spring underneath it, that's the check valve.
If it doesn't have one then there will be no spring visible, it will just be a flat plate at the bottom.

That's my understanding of it anyway.

The tops are identical, you're looking in the wrong place!

If it's any comfort, my engines both have the check vales in to prevent draining, and after leaving them a week they take a while to achieve oil pressure (not sure but 10-15secs? Seems ages) However if I've only run them the day before pressure comes up very quickly, 1-2 secs.

 

[Plevier]

http://www.framcatalog.com/PartDetail.aspx?b=F&pn=PH8A says it has an anti drain valve

 

[RichardS]

Have a look inside the filter, down the centre hole at the bottom.
If you can see a valve type thing with a spring underneath it, that's the check valve.
If it doesn't have one then there will be no spring visible, it will just be a flat plate at the bottom.

That's my understanding of it anyway.

The tops are identical, you're looking in the wrong place!

If it's any comfort, my engines both have the check vales in to prevent draining, and after leaving them a week they take a while to achieve oil pressure (not sure but 10-15secs? Seems ages) However if I've only run them the day before pressure comes up very quickly, 1-2 secs.

The anti-drain valve in screw-on filters is usually just the rubber flap identtified by the OP. Plevier's link says the Fram has one, as the OP thought, so both filters would be fine.

Richard