Mistery peep hole - I can't see anything!!
Ok, I've put the engine back together... everything is simply LOVELY...
In the process of the rebuild, I've learnt just about what every little thing does, where every bolt goes and why certain things go up, and others down - and some don't move at all.
HOWEVER -- I still haven't found a use for the HOLE in the cylinder head cover. Its got a screw PLUG in it. (the same size as the plug to check the TDC marks)
I have looked in it... for a long time.. and all I can see is a bit of the cam sprocket and chain.
I don't expect any marks there, cos the aligning marks on the cam chain sprocket is not on the outside diameter.... and anyway... you'd be a little bit stuffed if you've got to check for the alignment AFTER you've put the cover back.
WHY is it there?
WHAT am I supposed to see through the hole? (other than around 3 sprocket teeth and 2 links of the cam chain)
I HAVE LOOKED IN MY BOOK from cover to cover - and it doesn't mention the hole, or the plug. At all.
I can't sleep at night. Thinking about that hole.
Am I supposed to see anything meaningful??