PD: Primary Drive Case Drain

[Alyson]

I use this in my Vincent and Triumph TR4A

MT-90 75W90 GL-4 Gear Oil

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that's the name I couldn't remember ! Thanks !!

 

[highbury731]

Use a drain plug like this. View attachment 50299

What part is that, or what bike is it for?
If it's a recent Triumph part you can expect it to be USC or metric thread.

 

[Michael Vane-Hunt]

It would be metric as it is for a new Triumph Thruxton.. But I am sure a clever chap could change the thread. If one is going to drill and tap a hole in the primary it could be any one of several sizes and threads.

 

[Gary Gittleson]

I went here: https://drainplugmagnets.com/# for a drainplug for my Rapide.

At the top of the screen, there's a drop down for "threads". Choose BSP. My recollection is that the Vincent uses 3/8" for both the gearbox and the engine.

 

[oexing]

Nice BSP plugs available at Aliexpress, in stainless , Allen head or hexagon. But you´d have to fix a magnet yourself. Magnetic plugs seem to be all metric these days.
Hexagon head would be better for drilling a hole and glue a magnet into this.

Vic

0.4US $ |M8 M10 M12 M14 M16 M18 M20 1/8" 1/4" 3/8" 1/2" 3/4" 1" BSP Male 304 Stainless Steel Hex Socket Head End Cap Plug With FKM Gasket|Pipe Fittings| - AliExpress

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0.37US $ |1/8" 1/4" 3/8" 1/2" 3/4" 1" Bsp Bspp Male Thread 304 Stainless Steel Hex Head End Cap Plug Pipe Fitting Coupler Connector - Pipe Fittings - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

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0.48US $ |With ED Seal Ring 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1 1/4" 1 1/2" BSPP Male SS304 Countersunk Plug Solid With Flange Hex Socket|Pipe Fittings| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

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0.48US $ |1/8" 1/4" 3/8" 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" BSPP Male 304 Stainless Steel Countersunk Plug Solid With Flange Hex Head|Pipe Fittings| - AliExpress

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[Gary Gittleson]

Wrong (again). The https://drainplugmagnets.com/# site clearly states that 1/4" is the correct size for Vincents.

 

[oexing]

Wow, 35 Dollars for drain plugs ! For Vincents my guess 1/4 BSP in most places and for a fraction of dollars you get a handful of Ali plugs plus magnets for all your bikes.

Vic

 

[Gary Gittleson]

True enough Vic, but it saves time and I really don't expect to buy more, since I can't afford to have more than the one Vincent and the other bikes have magnetic plugs.

 

[Robert Watson]

Wrong (again). The https://drainplugmagnets.com/# site clearly states that 1/4" is the correct size for Vincents.

1/4 BSP, but uses a 3/8 BSF spanner

 

[highbury731]

This is my version of the mod to be able to drain the primary case in a neater way than pulling the cover away from the engine. The screw for that spot has an o-ring and isn't tightened as much as the rest.

View attachment 50294

I have now done your drain mod, filing the outer case with a rat tail file. I just ordered some M5 fibre washers, which will just fit in the outer case recesses (10mm) for the cover screws. Yes, I will have to drill or file them out to 1/4".