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14th September 2020, 21:35 | #11 | |
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Good tips thanks. Once I get the plug out I am going to re tap with greese as per your tips. Also I will be flushing with new transmission fluid and will fit with a magnetic plug too. Recommendations state tap the next size up. I assume the drain plug is the same size of the filler plug which is M18 x 1.5. Tapping kits I see jump from M18 to M20 so I guess I would have to tap to M20 as no M19?
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14th September 2020, 21:46 | #12 |
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14th September 2020, 22:48 | #13 | |
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Helicoils are the answer where there is a shortage of metal and it would be impossible to form a new thread. When fitting the new plug gentle force is all that's required to tighten it. A small drop of thread lock or a small hole drilled through the head of the plug to fit a retaining wire. ( As per critical bolts in car or motor bike racing. ) There are many easy answers to put right stripped out threads. The clever bit is using the solution that solves your personal problem.-- |
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15th September 2020, 06:19 | #14 |
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15th September 2020, 06:42 | #15 | |
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As Trikey says you could use a screwdriver to get behind the plug as you turn it. I have a set of thin straight jawed mole wrenches and a small pair of those could grip the plug and then you can turn and pull evenly at the same time which might help. |
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15th September 2020, 09:13 | #16 |
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Timesert seem to have one disadvantage if you are rethreading in situ, more swarf around. Rethreading with a tap traps most of the surplus material in the flutes (greased).
For perfection you could consider pouring (or pumping) oil into the filler and allowing it to run out the drain to wash out the swarf. |
18th September 2020, 19:00 | #17 |
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Well I finally got the drain plug out and what a mess! I used a small pry bar to get behind and even out the plug then undo.
The plug looks OK but the threads are well and truly gone in the gearbox. I have cleaned up and removed all debris that I can see. The drain plug (and filler) are both M18 x 1.5 so using my M18 tap will be a waste of time. I cannot see any M19 tap kits so will go with M20 x1.5 and use cutting paste. The thread depth is fairly shallow (8-10mm) compared to the filler, so not much to tap. Winds me up how it can get to this state - I wish I'd changed the oil myself originally rather than let the mechanic do it whilst he was doing other work on my car. Teaches me a lesson..
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Last edited by smabious; 18th September 2020 at 19:15.. |
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