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Leaky oil filter - why?

3383 Views 18 Replies 10 Participants Last post by  Tongie
Have an annoying oil leak which i have tracked down to be the oil filter.
There was oil and crap all through the engine bay (pretty thick too) when i got the GQ and assumed that the sump needed tensioning.
Anyway, did an oil and filter change and cleaned it all up only to find that it is the oil filter that is leaking and not the sump.
Going by the massive amount of oil in the bay previous, im going to assume the old filter was leaking as well as the new one.
Now, the filter is on properly and tight - ive done filters many times before and this one was no different - so why is it leaking?
Is there something missing from the block like a filter extension or something?
The seal on the filter is good so i can only assume that there is something missing.
You can see a bolt hole for something under the filter, however, im not sure if there is or isnt one above it.
The engine is a TB42 carby/auto.
Any ideas?

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Oil leak

It's hard to tell from the pic's but it almost looks as if the outer rim of the filter is touching on the raised section with the thread in it.
This would cause the filter to not tighten properly onto it's seat.
Otherwise check the seal seat on the engine for little bits of rubber from previous filter seals that sometimes leave bits behind when removed.
This seat needs to be nice and flat for the new filter to seal on.
Also you could clean out that thread and loc-tite a grub screw in it to eliminate that possibility.
Any chance of a pic. with the filter off?
I know you've probably thought of these things as you say you have done lots of filter changes before.
Let us know how you get on.
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