Thread: Cylinder block plugs on 1955 S1

Some photos of the tap made up some years ago for cleaning out the threads in the head where the plugs go as discussed.

First is the piece of round used. The thread used is on the right.


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Second is the tap itself


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Hope these are of some help. Sorry about the photo size . . . new to photos ! At least you can see it close up !
Regards

Thankyou very much to you all for your advice.
I will chase up the a thread file now I know the correct details, source the plugs and get them fitted. This vehicle hasn't been running for 12 years so am loking fwd to getting it firing.
Will keep you posted on progress

Thanks again
Rgds
Steve

I have now placed an ad in Markets under Hobby Equipment and Supplies for Sale. 1'" x 16 tpi BSCon tap and Dies. I have no financial interest in these. Contact the owner direct and haggle.

G'day All, I know this isn't S1 but it's still along the same idea in this thread.
I had to replace one of the core plugs in my S2A 4cyl engine, the core plug supplied was undersize to say the least, anyway I made my own out of brass





I'm only a amateur, self taught on the lathe, anyway my job was a success, and I have had the BS Conduit taps set for probably 30 years hope thats of some help cheers Dennis

That's very nice work . What type of tool is that , a indexed tool ? I use the HSS tools I shape/sharpen myself on the grinder..... 60 degrees for most threads .

MIKE

Indexable insert RH turning tool, looks to be TPMR. TC inserts are wasted on brass. Cutting speed for TC on 25mm brass is 2000+ rpm more than most hobby lathes will run at.

60 degrees for metric, Unified, and BSC thread forms, 55 degrees for Whitworth thread form, and 47.5 degrees for BA.