Sump plug dripping

[Phil Stag]

Hi, both gear box and engine plugs have a very small drip. The sump plug is new and at the right torque. Is there anything I can put on the thread to have a good seal?
Thank you,
Philippe

[73 Mimosa]

Wrap some PTFE tape two or three times around the threads before you wind it in.

[1959terry]

I wish it was only my sump plug leaking. You lucky, lucky pers😄n

[jbuckl]

Just my 2p:-

There are some new sump plugs that are not capable of sealing because they are parallel thread.

I had one, I trusted it because it was new....and chased the oil leak everywhere including checking the rear main oil seal (gearbox out) etc.

Then I found the plug wasn't tight enough. Thought i'd sorted it then. Nope!

Then I found it was incorrectly supplied ~ parallel thread!!!!

The correct taper one worked.

The boss is brazed to the sump..... also check the leak isn't from a 'ground down' boss / brazing or even cracked brazing.

[rare1]

It's a triumph is that all you have to worry about. A small drip

[Phil Stag]

It's a triumph is that all you have to worry about. A small drip

Yes, lucky me!

[Phil Stag]

Wrap some PTFE tape two or three times around the threads before you wind it in.

Thanks guys I'll try that, hoping I have the right thread on the plug.

[andybaulf]

You are quite right. The thread in the engine sump as too the rear axle box is a tapered thread (my car is an auto). To be exact it is a ⅜ x 18 NPTF (Taper Dryseal) I have numerous arguments with suppliers who want to flog off a straight threaded sump plug, mainly because that was what they had in stock, and wanted to sell. I have managed to get a magnetic dry seal sump plug from an American source (sorry I can't find the invoice but I did find it on line

[Phil Stag]

Hi Andy, is this what we're talking about?

https://www.fastenal.com/products/details/81134

Philippe

[andybaulf]

That's it, only mine has a strong magnet fitted. Sorry I can't find the maker but they are available. Have a search on line.

[len]

I have had a similar problem with an engine sump plug. I bought a different type from J. Paddock. It had a copper washer on it.perfect no oil leak.
Len

[Ray Smith]

Also had oil dripping from sump plug, bought magnetic type from Wards, don`t know if tapered, had a copper washer on it, worked for me.
Ray

[Phil Stag]

Hi guys, ordered one from j.paddock magnetic with washer, should be here tomorrow. The American site wasn't clear about shipping charges.
Thank you all,
Philippe

[andybaulf]

Sorry to go on about this problem but you cannot fit a straight thread plug into a taper thread drain hole. These trader will flog you numerous plugs fitted with copper washers BUT THEY ARE WRONG. Believe me I am an Engineering Technician (retired) and I do know what I am talking about. The engine sump drain on numerous Triumph cars are fitted with a tapered dryseal thread which makes an excellent seal when you fit a dryseal plug. There are threads on SOC forum some years ago that confirms this fact....Have a Look!!!

[Lingen]

Andy. Good advice. The trouble is that the "Wrong" ones do go in to the hole, and can be tightened, even perhaps tight enough to form a seal if you are lucky, but the threads in the sump will soon get damaged, which may mean removing it to get it repaired. I wonder who would be liable for the cost of the repair?
Mike.