sump plug

dougi · Post by **dougi** » 17 Jan 2009 19:25

can anyone give me the thread sizes, diameter and thread pitch for the sump plug on a 1978 3 1/2 sport engine. on modern jap bike you can get magnetic sump plugs. so if i have thread sizes i can use one from a jap bike

mgill · Post by **mgill** » 19 Jan 2009 00:52

Or glue a magnet to your plug....

dougi · Post by **dougi** » 19 Jan 2009 08:28

thanks i thought of that, but which glue ? the glue needs to handle the heat and vibration while the engine is running and i need to know how hot the engine gets to pick a glue !

corsaro chris · Post by **corsaro chris** » 19 Jan 2009 09:56

The original Harglo service manual says that the sump plug is 18mm

CC

3potjohn · Post by **3potjohn** » 19 Jan 2009 17:35

I got some neodymium magnets from a firm called Cermag last year-nickel plated ones as it is corroded quite easily. I have araldited one under the sump plug, though it might have stayed put without. Didn't fancy it sticking onto the chain.
Anyhow I have so far not collected any manhole covers or scaffolding as I pass.They are about the diameter of the end of the sump plug and around 8mm thick. Put 2 together if you dare.You can get them apart with extreme effort and caution or you will get blood blisters as they snap together.Quite brittle too.
I should weigh the plug /residue to see if there is any increase but I have not.
I got 10 for about a tenner. If you want I can send one up. You will find the postman attached to the letterbox.

dougi · Post by **dougi** » 20 Jan 2009 19:12

today i changed the engine oil and my 3-1/2 the sump plug size is 22mm dia X1.5 mm thread pitch and 18 mm spanner size !!

mgill · Post by **mgill** » 20 Jan 2009 20:02

Let us know if you find something that fits.
I'm about to drill mine for lock wire and if I bung it up
I'll need a new one!

dougi · Post by **dougi** » 21 Jan 2009 18:53

i found this one but its in US dollars which makes it expensive to ship to the uk.
we need M22 x 1.5mm thread pitch
order Number--- 1016 SM---

http://www.magneticdrainplugs.com/metric.htm

3potjohn · Post by **3potjohn** » 24 Jan 2009 08:30

My sump plug looks more like the type shown as 1025 or 1009, though as it is in situ I cannot check the size.