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Tonight, I decided I really had to get to the bottom of exactly where the leak was coming from.
After cleaning off the join at the bottom of the dipstick tube, I used a wirebrush wheel to remove the paint. I could then see that the 90 degree joint had originally been brazed. But even with a magnifying glass, I couldn't see a split in the brazing.
So I stared through the magnifying glass for 5 minutes and then, Eureka, I worked out where was the problem! There was surface corrosion near to the join and one tiny little pinprick had broken through the surface of the tube from which the tiniest smear of fluid slowly started to escape. I've highlighted it in the second photo.
It's almost unbelievable that a pinprick almost invisible to the naked eye, could cause this leak. It just goes to show how ATF can escape through the tiniest of imperfections.
So, tomorrow, I'll mask off, clean up the whole area more thoroughly, and then quickly smear the whole of that area with some Evostick epoxy metal putty which should seal it nicely, before painting it.
Hopefully that will be the end of a frustrating 2-year quest to stop a persistent drip!
Paul
I would use a liquid high temp epoxy glue, like araldite, I am not sure epoxy metal putty will really get into that hole. Good luck and good find, anyway!
Last edited by Greg in France; Mar 12, 2024 at 04:03 AM.