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Mistery peep hole - I can't see anything!! Mistery peep hole - I can't see anything!!
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Sean Howman, The Pamir highway in an unseasonably cold late October, Tajikistan

I haven't been everywhere...
but it's on my list!


Photo by Sean Howman,
The Pamir highway in an unseasonably
cold late October, Tajikistan



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  #1  
Old 5 Jun 2009
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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??


...
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Old 5 Jun 2009
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i was just about to go the pub and you got me thinking about it so i had to go to the workshop switch off the alarm grab a spare cover and have a look.
bingo worked it out straight away its actually just for assembling the rocker arm shaft cos the front shaft is in 2 pieces to allow spark plug access
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Old 5 Jun 2009
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Is it part number 17 in this diagram?



If so, then THIS site says it's a Plug Viewer, for viewing your plugs of course. The big question is, which plugs and why would you want to?

Of course if it's not, then don't worry about why you haven't got a plug viewer, after all you don't know which plugs anyway.

PS. Doesn't it have a "y" in it?
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Old 5 Jun 2009
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Quote:
Originally Posted by Alexlebrit View Post
Is it part number 17 in this diagram?
i think we are looking at part number 7, as wolfzero says its so you can slide the rocker arm shaft out
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Old 6 Jun 2009
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from my understanding of the question it was part no 7 xt girl was talking about as it lines up to her description exactly thankfully i worked it out quickly so made it to the pub in good time
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Old 6 Jun 2009
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Quote:
Originally Posted by Lamin Sambou View Post
i think we are looking at part number 7, as wolfzero says its so you can slide the rocker arm shaft out

Yes, its part no 7 - HOWEVER - the cam chain and sprocket is sitting right behind the hole.... how are you supposed to get anything through it??

If you're removing the rocker arm shaft, wouldn't you have the cylinder head cover off anyway?? You'd have to have the cam sprocket and chain out, to get anything through the hole...!!



PS: Phew wolfzero... so glad I didn't spoil your drink... or give you sleepless nights!! :-)
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Old 6 Jun 2009
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Eeeeeeaaaaoooohhhhhhhhhh!!!!!!

I get it! I get it! I get it!!!


The rocker assembly sits INSIDE the cylinder head cover.... sooooo... you'd have it off anyway... and then you can slide the megafter through the hole.


YIPEEEEEEEEEEEEEEEEEEEEEEEEE and thanks you guys!!!
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Old 6 Jun 2009
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yes its only there for assembly not for inspection it just seems like an inspection point cos its the same style as the timing cover screw :confused1:
if it was a bolt head or something you prob wouldn't have given it a second thought
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Old 8 Jun 2009
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.............

??

[Something weird there happened] Couldn't have downloaded all the responses which made my post disjointed. Glad you found your answer tho :-D
Last edited by bruken; 9 Jun 2009 at 11:32. Reason: some post responses were missing on reply.
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