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Re: Timing Cover BSA WM 20 1943

Andre the plug sticking out is the locating dowel for the oil pump drive spindle. It has a chisel shaped end which sits in a groove in the spindle. It's obviously been semi pulled out and is not sitting in it's correct position. If it's stuck? Pull it out by screwing a 1/4 x 26tpi bolt into it. Clean it up and put it back properly. If it sits down too far into it's hole, place a small washer on top of it to make up the gap.

Do not run your engine without it!!

Ron

email (option): ronpier@talk21.com

Re: Timing Cover BSA WM 20 1943

I'm not sure about the timing cover...M20 covers are available which do not have the 'lump' in the casting (That was machined out for the breather assembly when the cover was fitted to an OHV engine...)...

It is clear that at some point a common casting was used and machined (or not) as required...but in which year was that introduced?...I don't know personally but I'd be happy for someone to tell me!.. ...Ian

email (option): ian@wright52.plus.com

Re: Timing Cover BSA WM 20 1943

I would like to know as well, Ian.
My cover hasn't got the lump, so - is it earlier ?
And if so, what year ?

And Andre, don't forget the two rubber rings in you side cover !

Re: Timing Cover BSA WM 20 1943

Mine is the early type with the handy mag pinion cap......No lump. Ron
M20_278

email (option): ronpier@talk21.com

Re: Timing Cover BSA WM 20 1943

There is a picture I think of a WB30 which shows the breather fitted using this casting, so the molds did probably exist early in the war, then as production of the WM20 was increased and old molds wore out I can see no reason why this wouldn't have been used. It did waste a small amount of alloy but as its not aircraft quality it didn't make much difference.

Rob

email (option): robmiller11(a)yahoo.co.uk

Re: Timing Cover BSA WM 20 1943

Hi, all of you thank you for your comments. I will mount the timing cover and put the plug back in properly.

Cheers

André

email (option): Vplrn@hotmail.com

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