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Sump drain bolt

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Hi everyone, a naive question as per title. 

I have a 1948 model 18 and I am  unsure where the sump bolt is  as it is wet dumping if left for more than a week,  I can only see one bolt head 9/16 I believe  but it is so tight  that I don't want to do any damage, if it's the wrong one, hopefully  someone can point me in the right direction. Thanks in advance .Paul 

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Hi Paul,

   The sump plug on the 1948 (one piece rocker-box) engine is underneath the crankcases in a partial recess, so it's best to use a Whitworth sized socket to remove it. The plug is 3/8" Cycle thread which is too fine in aluminium and easy to strip the thread if over-tightened. This will mean you will have to address the wet-sumping, because continual draining will soon damage the thread in the crankcase. You might have to consider a tap or one-way valve on the oil feed.

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... has been changed by a previous owner to a metric coarse thread which is better. I'm not about to strip the whole lot to replace something that works well enough......

 


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