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post #1 of 23 (permalink) Old 19th March 2017 Thread Starter
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Question Yet Another Sump Plug Thread

It's years since I was on this forum as my daughter sold her Clio. Now my son has a Megane (2007 1.6 petrol) so in my foolish cavalier way I volunteered to change the oil and filter.

It started badly enough with removing the plastic undershield. Two screws were missing, one sheared off due to being seized and another just spun around. I finally removed the spinning one by drilling it and then the gentle application of a cold chisel and a large hammer. (Slight deviation: after refitting the undershield it is now held on by 2 out of 3 screws on the front edge, just the plastic clippy things in the middle and one screw and a tie-wrap on the rear edge. It seems nicely secure so I don't think it's doing to fall in the road and I lubed the screws so it will hopefully be an easy job to remove next time.)

Back to the sump plug, and this is where I'm wondering if I'm losing my marbles. Everything I've read says that it should be removed with an 8mm square. But none of my square drives fitted. One (probably 10mm) wouldn't go in, and the next smaller one (presumably 8mm) was far from a snug fit and seemed likely to round something off if I leaned on it. Trying to get a detailed look at it was not easy as it was far too close for my eyes to focus properly, but it looked like a special socket form. The best I can describe it is like a 4 lobed torx head. Is that possible? I'm really beginning to doubt myself on this now. I don't think the roundy lobes were due to it having been rounded off in the past, but I can't be sure.
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post #2 of 23 (permalink) Old 19th March 2017
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Re: Yet Another Sump Plug Thread

Deffo an 8mm square and should be square.

I'd suspect that someone has read things like a door handle drive fits (advice on the net but wrong) and tried to force it.

One of these may hammer in and grip ??
Draper Multi Sump Plug Tool / Spanner | eBay

Fairly large dia so punch to one side and a hammer may loosen ?
Grind down a 10mm square drive till it fits ??

If keeping the motor for a while, consider cutting a hole in undertray for access before the next oil change
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post #3 of 23 (permalink) Old 19th March 2017
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Re: Yet Another Sump Plug Thread

as above if you get a large rubber bung cut out the correct hole size then insert the bung or as many do leave the sump cover off the amount you see on the roads with them dragging along the road just waiting to fall off amazes me
also if you have an oil leak/water leak they hide the problem
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post #4 of 23 (permalink) Old 19th March 2017
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Re: Yet Another Sump Plug Thread

Why go to the bother of possibly messing up the sump plug with the wrong tool or just bad luck when there is a cleaner and possibly quicker way of doing it with a vacuum oil and fluid extractor shoved down the dipstick tube ?

But anyway I have noticed in places people recommending to replace sump plugs and washers after they have been removed, and a fun one always was the magnetic sump plug to capture any bits of metal.

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post #5 of 23 (permalink) Old 19th March 2017 Thread Starter
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Re: Yet Another Sump Plug Thread

Thanks everyone for such quick replies.

Dancingdad, I already had the idea of grinding down a 10mm square up my sleeve in case I need it. Looks like I will need it.

The Draper tool is a rave-from-the-grave. I had one of those many moons ago. The as-forged finish always seemed crude but the taper on the squares could be handy. Lightbulb moment! I'll grind a taper onto a 10mm square and that should do it, as long as I can get it off afterwards.

DeKaye, I already have an extractor pump (brass plunger type, not the nice Pela one) but it is horribly slow and awkward to use, especially in a confined space. If I can get the sump plug out I would rather lie on my back, take off an undertray and grapple with the plug. On the other hand, it's a nice back-up solution if the other options fail.
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