Sump plug thread size

[kevtherev]

is it m12 or M14?

metric pitch?

[R0B]

m14 kev

[Simon Baxter]

M14x1.5
Could be allsorts by now though.
Unbelieveable amount out there with welded up spark plugs as sump plugs as some garages only seem to keep one size heliciol - spark plug sized!
Gash B*stards.

[kevtherev]

OK thanks lads
I'll try tapping the thread and a nice new copper washer with some ptfe

I may have to go up a size and re tap..
Removing the old (spinning) plug Saturday

[Steve P]

Keep us posted Kev, we might have to do the same on ours.

[kentishvanman]

Wot I did with mine wos to drill and tap the sump to take an 'insert'.
Think thats the right name. Like a hollow bolt with an internal thread. Plumbers/gas merchants stock them. Insert into sump with loctite then plug into insert with copper washer. I always use ptfe tape.
Don

[kevtherev]

OK I have nearly all the tools and parts, to replace M14 VW plug which has stripped the thread badly in the casing

M16 X 1.5 tap
plug driver
M16 sump plug. (Renault part No. 770 307 5347)
crush washer (Renault Part No. 770 306 2062)



just have to get an M15 drill and hope I can get a drill with the chuck to take it.

[toomanytoys]

Machine mart (Clark) do a set of "blacksmiths" drills in a wooden box for about 24 quid... yes I know its still a good bit, but they have 13mm shank and are quite decent quality.. but only worth it if you think you might need to drill some bigger holes in the future.. (IIRC 25 biggest)

[toolsntat]

Kev would a reamer be a better / easier thing to use??
Usually loads at the bootsale

[kevtherev]

Thanks for the suggestions..
I think they might be the ones Si as I can go up to 13mm
I thought of a reamer toolsntat ... but was thinking of the swarf
bit worried about getting the drill in square too.

[toolsntat]

How did you get on with this Kev

Andy

[kevtherev]

Ok
I can happily report the new plug is in... and there are no weeps drips and spots.

However
drilling out the plug hole was very difficult. the bit kept grabbing and spun the dill out of my hands a number of times.
I also think an M14.5 drill would have been better as was suggested.
reason being is the sump plug is a loose fit but goes finger tight and then will turn a quarter to crush the washer and nip up.

I am thinking of going up another size (M18)
There's plenty of room to go up

[jamesc76]

I am thinking of going up another size (M18)
There's plenty of room to go up

Thats getting big you'll have to watch out when chaning the oil as it'll come out that fast lol

[tezza]

please dont trust that plug, go to next size up and google drill size for M18 probably 16.8 but check,that loose thread could let you down, good luck tezza.just checked its 15.5

[toolsntat]

Thought the "grab" factor might give you a bit of grief

If you fancy trying a reamer for any further attempts, there`s a fair few knocking about in the stores of tat here at "tat towers" but can`t guarantee the right one without knowing size and looking

Andy