When I first attempted to change the transmission fluid and filter after buying my 1990 4L model XJ40, I discovered that the bolts holding the filter in place were done up very tight and their heads were stripped. Unfortunately the worst case was the round-headed bolt in the contre recess of the filter, which looked completely rounded out, and my screwdriver was slipping with only the slightest turn. Unprepared to deal with the problem, I left the old filter in place and just replaced the fluid.
Now it’s time to change the fluid again, and today I attempted to use a head-gripping screw extractor on the stuck bolt. Unfortunately with such a big round hole in the bolt head already, this only helped to make it bigger and rounder. I’m too nervous to use one of the drill-in types of screw extactors because I worry the the bolt won’t be wide enough and might split in place (plus the last time I tried them on this car I went through a whole pack, breaking and then drilling them out one-by-one (instead I drilled through the bolt itself in the end)).
So, my questions:
Are there any other options for removing the bolt? My next guess is to use a cutting disk on a Dremmel to cut a slot into the bolt, but if I slip and put a hole in the filter, then still can’t get the bolt off, I’ll be stuck. This thread (which I didn’t find before, the search on this new forum site must be better) suggests that as an option though: [xj40] Torx heads on transmission filter bolts stripped
What are the specifications of the bolt? I asked Jaguar this, and whether they sell replacements, last time, but they couldn’t help. Of course I can measure it once it’s out, but then I’ll have to stop mid-job and drive into town to get a new one (and hope they have one suitable).
How irresponsible would it be to leave the same filter on again, and perhaps for ever after. This thread gives me confidence that it might be an option: [xj40] Transmission Fluid/ Filter Change? . If it makes any difference, the fluid that came out of it today looked like new.
While we’re on the topic - the black thing in the round dimple at the bottom of the pan. It looks like the magnet, but a gooey black stuff comes off when it is touched, I’m afraid to try cleaning it in case it’s not a magnet and I end up cleaning it all away. Advice welcome.
Thank you for reading.
The bolt hole where my problem is, circled in red: