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Help with grub screw location

nvshadow

Website User
VOC Member
With expert help, I have almost completed a rebuild on my Black Shadow engine. But, I find that I have one grub screw too many! The 2 that close the oil galleries in the primary cover are in place and there is one other that measures .233 dia x .53 long that is left over. Does anyone know somewhere in the engine that needs a grub screw that I could have overlooked? I don’t see any indication of it in the parts diagrams and my memory doesn’t help me from the time the engine was dismantled. Is there somewhere else on the cycle parts that it could have come from? Thanks -here's hoping I don't have to take it all apart again! Sam.
 

john998

Well Known and Active Website User
VOC Member
Grub screw

Hello Sam, The blanking screws in the timing cover are 5/16 according to Eddie Stevens.
I cannot think of a 1/4 grub screw on the Vincent, but even after 40 years you never stop learning with Vincents. Is it whitworth or BSF?
Regards John.
 

nvshadow

Website User
VOC Member
grub screw

Hello John, thanks for the fast reply! This screw is BSF and I'm trying hard to remember if I took it from the interior of the engine when dismantling it; but no recall as yet. Sam.
 

piggywig

Well Known and Active Website User
Non-VOC Member
Grub screw hunt

JOHN,
A couple of days ago I was checking for an oil leak that appeared to come from under my motor around a grub screw! It was not the source of the leak but the oil pump plug OP33 directly above was the culprit.As the grub screw was not leaking I left well alone. Perhaps you are missing this one, it can be seen from below.
It may not be the one, but at least it is worth a look.
Col.
 

john998

Well Known and Active Website User
VOC Member
Grub screw

Hello Sam,
have you had some one with a twisted sense of humour in your work shop?
It could be worse it could have been a gudgeon pin circlip.
Regards John.
 

nvshadow

Website User
VOC Member
grub screw

Hi John, that would be worse! But, I seem to remember (real or imagined) from 18mths ago when I took the engine apart, that I took a grub screw out of somewhere (not the oil galleries) inside the cases. I'd better not think about it too hard or other extra parts might start appearing. Kevin pointed out that the parts list does not include a 1/4 screw, but the parts box does and Russ suggested looking under the crankcase - that one is in place. Sam.
 

Len Matthews

Well Known and Active Website User
VOC Member
Not connected with with the present dilemma but I recall a story told to me by the late and greatly missed Alan Rennie. When a new fitter joined the team on engine assembly at the Works it was a favourite prank to craftily lay a spare mainshaft bearing spacer on his workbench, wander nonchalently by a few minutes later, pick it up and ask "Did you leave that out?" !:)
 

stumpy lord

Well Known and Active Website User
VOC Member
grubby screws

years ago one of the well known restorers of vincents had the habit of drilling two small holes through the walls of the gear box to expidite the removal of the main gear box bearing[the one behind the the gear box sprocket], the holes where then filled with two small grub screws. Could yor engine be one of these engines? How do I know about this, easy, we have one our self.
Many thanks to all who answered my question on norton gear boxes, Iam going to wait untill the next auto jumble at Nettly marsh to what I can find.
cheers norm:cool:
 

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