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Whats this bolt for?

  • Thread starter Thread starter UK-GT
  • Start date Start date
U

UK-GT

Guest
I had a small oil leak and I traced it to this Chrome bolt directly under the pickup cover so I took it out to see what was behind it, I am none the wiser apart from that it should have had a 'O' ring or rubber washer and it did not, hence the leak, I tried to find something to use until I can get the proper 'O' ring but I could not find anything, so I had to resort to instant gasket.

Any ideas?

9mOQNTzs.jpg

Gd4RILKn.jpg

9mOQNTzs
 
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If there is a spring inside that and it moves then its a pressure relief valve.
 
tatu said:
If there is a spring inside that and it moves then its a pressure relief valve.
Click to expand...

No spring. I managed to find it listed on the parts fiche (item 24), it says its for the oil gallery pin, but whats it for??

iWrBICOx.jpg

1hzeUtty.jpg
 
That's an interesting bolt gizmo- fortunately my 650 doesn't have one and apparently doesn't need one! mine has a solid metal plug driven in flush with crankcase surface.
 
tom203 said:
That's an interesting bolt gizmo- fortunately my 650 doesn't have one and apparently doesn't need one! mine has a solid metal plug driven in flush with crankcase surface.
Click to expand...

That is what my spare engine is like as well, just a metal (looks like brass) plug that is flush with the surface.
 
UK-GT said:
No spring. I managed to find it listed on the parts fiche (item 24), it says its for the oil gallery pin, but whats it for??
Click to expand...

That's me out of ideas sorry, seems odd that there would be a double seal arrangement.
 
Order and install 0-ring 25. No more leak, no more wondering.
 
tom203 said:
No way, I gots to know what it's there for and why none for me!
Click to expand...
As they say, lifes too short to worry. But they also say, the devils in the detail. But I think the saying that describes this the best, curiosity killed the cat!!
I am in the process of ordering the O ring but I need to sort out my clutch first (33year old springs).
I have done a search on the web but I can not find out what this 'gallery pin' is for and why some engines have it plugged and some do not.

I really want to get to the bottom of this, I hate starting something and drawing a blank.

I will try and keep this thread alive until I get an answer!!
 
I wonder if the fancy bolt is on early models (or vice versa) and then got added/eliminated later on- maybe engine designer contemplated oil cooler, but later decided it was overkill .
 
tom203 said:
I wonder if the fancy bolt is on early models (or vice versa) and then got added/eliminated later on- maybe engine designer contemplated oil cooler, but later decided it was overkill .
Click to expand...
The 650M (shaft drive baby kats) had oil coolers, didn't they?
 
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