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Author Topic: Engine Threads  (Read 55 times)

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june2020

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Engine Threads
« on: May 10, 2020, 01:02:38 PM »
I have been rebuilding an 18V MGB engine. I removed the oil line adapter from the engine block to replace the copper crush washer. When I went to put the adapter back in, I have had problems. At first, I could not get the threads to engage. So very lightly, I tapped in the wrench while driving the adapter. It worked, sort of. When I began tightening down the adapter, I met resistance. I back out and now the threads are damaged from what looks like cross threading.

I can tell he block is damaged. I don't believe it is too bad and that I can correct this with a tap and die, but I don't have a clue what size threads are on the adapter and conversely in the engine block.

Can you please tell me what the correct size tap and die I should get and what standard to threads are? Thank you.
Bob Carpenter

JohnTwist

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    • University Motors
Re: Engine Threads
« Reply #1 on: May 10, 2020, 01:19:02 PM »
I'm sure you've already taken care of this, but just in case -- the threads are 1/2" BSP parallel.  British Standard Pipe.  Not something you'll find at the local Ace Hardware.  You might try a thread file on the fitting that will smooth out the male threads.

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SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids, MI  49506

616-307-6737
johntwist@universitymotorsltd.com
www.universitymotorsltd.com

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