BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6507 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Oil filler thread size
Anyone know the actual thread size and pitch of the opening in the Rover valve cover for the oil fill plug/flame arrestor/etc? I make it to be about 41.75mm and about a 2.25mm pitch but that is nowhere near a standard size.
Jim |
Roverbeam Chad McNeely N.E. MO (78 posts) Registered: 06/09/2021 06:03PM Main British Car: Alpine S4 Rover 4.0 |
Re: Oil filler thread size
1 1/4" BSPP
I bought a plastic (dummy) one from McMaster to test fit - it worked. This site gives the thread specs, approximating Jim's metric measurements: [amesweb.info] Parameter Value Pipe Thread Size 1 1/4 Threads per inch 11 Pitch of Thread 2.309mm Basic Height of Thread 1.479mm Height of Sharp V Thread 2.218mm Major Diameter of Thread 41.910mm Pitch Diameter of Thread 40.431mm Minor Diameter of Thread 38.952mm Edited 1 time(s). Last edit at 09/11/2024 03:30PM by Roverbeam. |
MGBV8 Carl Floyd Kingsport, TN (4559 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Oil filler thread size
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6507 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Oil filler thread size
Figured it was something like that. Best price so far on a tap is about $47 which is actually quite fair really but a good bit to pay for a single use tool. Much cheaper and easier than making one though. Thanks all, and I will double check the thread pitch this morning. Should fit the 11 tpi gage perfectly I would expect. It should allow me some lattitude in configuring valve cover vents and such.
Jim |