Persistent oil leak - filter?

[RB72]

Hi there

I have had two mechanics - one a Bongo specialist, one not - identifying the oil filter as the source of a slight leak on my '96 2.5TD. Both changed the filter. After the first change, no oil leaked for about a week, then it began again. The second mechanic changed the filter again and reported that the seal on the previous one didn't look great, but the next day the leak was back.

Can there be a problem with the block where the filter screws on?

Very grateful for any suggestions.

[Northern Bongolow]

what filter or part number did they use, im thinking maybe a too small diam filter was used on the 1st change, then the second change just copied the part number so did the same fault.
there are lots of filters that will physically fit, some smaller in both length and diam. its worth a check. failing that take it back to the fitter and get him to remove it and check the seat/O ring etc. if that is ok check for cracks around the base.
the turbo which is just above is also a suspect, check the 2 pipes that supply / return the oil, these are metal pipes and are known to crack, check them carefully.

click on this link below, then click on the links to the pics to see a cracked pipe.

viewtopic.php?f=3&t=73985&p=695035&hili ... ak#p695035

[rita]

""Considering it Is the Oil Filter that is Leaking"" Yes as you mentioned it could me a problem with the mating surface on the casting,also make sure the an old ring has not been left in place. High oil pressure can also cause this fault (sticking BPV/BV) .

Can you give us the maker and part number of the fitted filter?.

Take Care

Good Luck.

[RB72]

Thanks both very much for your replies.

The filter is a Crossland, part no. 501690018.

The mechanic said there's only an oil feed pipe to the turbo, which he did inspect, but still, it might be worth looking at that again, especially having seen the photo you linked to, Northern Bongolow.

Rita, what do you mean by 'sticking BPV/BV'?

I really appreciate your help!

[rita]

Thanks both very much for your replies.

The filter is a Crossland, part no. 501690018.

The mechanic said there's only an oil feed pipe to the turbo, which he did inspect, but still, it might be worth looking at that again, especially having seen the photo you linked to, Northern Bongolow.

Rita, what do you mean by 'sticking BPV/BV'?

I really appreciate your help!

Tell your mechanic that this engine Should have a oil return pipe From the turbo,also worth checking the filter/oil cooler casting for leaks it could be SPRAYING from any of these parts.

BPV/BV bypass valve and balance valve.


Good Luck.

[Northern Bongolow]

[coryjoon]

It's unfortunate that you're experiencing a persistent oil leak despite changing the oil filter. If the issue persists even after replacing the filter, it's possible that there may be an issue with the filter housing or the block where the filter screws on. Here are some potential reasons for the ongoing leak:
Faulty Filter Seal:
Even with a new filter, a faulty or damaged filter seal could cause leaks. Ensure that the rubber gasket on the top of the filter is in good condition, properly seated, and not damaged during installation.
Cross-Threaded or Loose Filter:
If the filter is not properly threaded or is cross-threaded during installation, it may not create a proper seal, leading to leaks. Make sure the filter is tightened according to the manufacturer's specifications.
Cracked or Damaged Filter Housing:
Check the filter housing for any signs of cracks or damage. A damaged housing can result in oil leaks. If there are visible issues, the housing may need to be replaced.
Oil Cooler Seal:
Some vehicles have an oil cooler that uses O-rings or seals. If the oil cooler is integrated with the filter housing, a leak from the cooler seals could be mistaken for a filter leak. Inspect the oil cooler and its seals.
Oil Pressure Switch:
The oil pressure switch is another potential source of leaks. Ensure that the oil leak is not originating from the oil pressure switch, which is typically located near the oil filter.
Threaded Port on the Engine Block:
Check the threaded port on the engine block where the filter screws on. If there are any issues with the threads or if the surface is damaged, it may affect the seal.