Cylinder Block Drain plug thread
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Cylinder Block Drain plug thread
Hi Guys, I am just trying to it a new cylinder water drain plug in an early Range Rover, 1971 and the threads need cleaning out. I note the new plug I have is tapered and was wondering what thread it is in the block? It looks like it may be a 3\8 NPT but just a guess. If anyone knows it would help me along my way. Also, I will need to buy a tap if it is NPT would it be a standard tap to only clean the thread not take any metal out? thanks in advance. Andrew
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Another great idea and certainly something I can do if I cannot find a tap. I am a bit worried that the block is alloy, the plug is brass. I could see a right cock up occurring which is why I really want to do it properly with a tap. I have used your method before where I cannot find a tap, my Dad taught me that one!
Interesting point. Most of the threads into the block etc are Unified Coarse. Are the Buick versions that or American Coarse? I realise the two are similar.vanquishspirit wrote:thanks for the feedback. I was thinking NPT as its a US engine, but of course they would be blanks when machined, but perhaps Rover kept with all the tooling from the US? perhaps someone else has a view as well. cheers
Dave
London SW
Rover SD1 VDP EFI
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London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
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Same thing is it not? UNC and UNF are US threads, where as the UK used until after the Second World War, BSF and BSW (fine and course) and a variety of other threads BCY ( cycle threads etc etc) . I am fairly confident the threads will be the US pipe thread, i.e NPT as opposed to the standard UK BSP. I have ordered a tap so will await to see whether its correct. thanks chaps
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Dont be surprised if its BSPT
Last edited by SimpleSimon on Tue Jun 21, 2016 8:33 pm, edited 2 times in total.
TVR Chimaera RV8 Mods & Megasquirt
As far as I can remember it's 1/4" NPT.
3/8" NPT would be too big. 1/8" BSPT too small.
Pipe threads sizing is not based on the thread diameter but is based on the bore of the pipe you are connecting. So the overall diameter of the thread would be the diameter of the pipe bore plus twice the wall thickness of the pipe. This applies to both English Imperial and US pipe threads.
JUST NOTICED THAT THIS IS AN OLD THREAD AND ALL MAY BE SORTED BY NOW
3/8" NPT would be too big. 1/8" BSPT too small.
Pipe threads sizing is not based on the thread diameter but is based on the bore of the pipe you are connecting. So the overall diameter of the thread would be the diameter of the pipe bore plus twice the wall thickness of the pipe. This applies to both English Imperial and US pipe threads.
JUST NOTICED THAT THIS IS AN OLD THREAD AND ALL MAY BE SORTED BY NOW