AgentMichaelScarn
CB750 Member
Hey guys! I've been browsing this forum for awhile but this is my first official post here. I wish it were under better circumstances. I've been riding my 1980 CB750K for a few hundred miles when an oil leak developed from where the tachometer cable goes into the engine.
I watched a few how to videos and read some guides, it seemed super easy and simple, what's the worst that could happen?
Now the tachometer housing on the DOHC is super inconvenient its pointed right at the frame with very little room to work. Every guide I read said to just screw a screw into the gasket and pull it out. After several attempts I finally got it to grab, and gave it a gentle pull with the pliers. I immediately could tell something was wrong though.
Now I looked as best I could and could see the o ring, but I think it was mostly deteriorated, the screw grabbed into the metal backing and pulled it out, causing some damage to the housing itself. After cleaning up what amoubt of remaining gasket I could find, I tried to gently drive the new gasket into place. This is where my second mistake occurred, from gently tapping a socket I managed to break off the side of the housing too.
So now I have what appears to be a completely busted housing, I had to pull the valve cover to remove it and it doesn't look good.
http://i.imgur.com/FIhrFqO.jpg
http://i.imgur.com/6r75DfD.jpg
http://i.imgur.com/kssSVmG.jpg
It's hard to take pictures of it but this should show it. I'm really concerned about the torn metal backing piece. Also, I don't understand how the gasket is supposed to fit in there. I know I have the correct seal, but I push it in as far as possible and its not far enough back to work.
I'm really baffled by all of this. It doesn't seem anything like the videos I watched or the forum posts I read. It also doesn't seem like this piece is sold anywhere so I don't know how to go about replacing it.
Any and all suggestions are extremely appreciated.
I watched a few how to videos and read some guides, it seemed super easy and simple, what's the worst that could happen?
Now the tachometer housing on the DOHC is super inconvenient its pointed right at the frame with very little room to work. Every guide I read said to just screw a screw into the gasket and pull it out. After several attempts I finally got it to grab, and gave it a gentle pull with the pliers. I immediately could tell something was wrong though.
Now I looked as best I could and could see the o ring, but I think it was mostly deteriorated, the screw grabbed into the metal backing and pulled it out, causing some damage to the housing itself. After cleaning up what amoubt of remaining gasket I could find, I tried to gently drive the new gasket into place. This is where my second mistake occurred, from gently tapping a socket I managed to break off the side of the housing too.
So now I have what appears to be a completely busted housing, I had to pull the valve cover to remove it and it doesn't look good.
http://i.imgur.com/FIhrFqO.jpg
http://i.imgur.com/6r75DfD.jpg
http://i.imgur.com/kssSVmG.jpg
It's hard to take pictures of it but this should show it. I'm really concerned about the torn metal backing piece. Also, I don't understand how the gasket is supposed to fit in there. I know I have the correct seal, but I push it in as far as possible and its not far enough back to work.
I'm really baffled by all of this. It doesn't seem anything like the videos I watched or the forum posts I read. It also doesn't seem like this piece is sold anywhere so I don't know how to go about replacing it.
Any and all suggestions are extremely appreciated.