SOHC.co.uk Forums > CB750
Help! What's caused this?
K2-K6:
Interesting comparison, graphite appears to hold sway with high heat application though http://www.molybdenum42.com/molybdenum-disulfide-grease-vs-graphite-grease/#:~:text=The%20biggest%20difference%20between%20them,than%20that%20of%20graphite%20grease.
Graphogen is very good and probably exceeds most in this arena.
Moly based, definitely as torque load increases and standard in things like CV joints (relatively low heat but high contact pressure) probably more readily available in workshops though.
Oddjob:
Wasn't saying use it Nige just that Honda seem to have swayed in that direction lately.
I have a tube of Graphogen still so I'll carry on using that until it runs out.
K2-K6:
:D yeh Ken, I like a good lubrication comparison me ;D
It's a shame for Nick to get stuck on something like this though, hopefully it won't be too bad to sort out.
Trigger:
--- Quote from: Bristolbadger on March 25, 2022, 07:36:56 PM ---
--- Quote from: Nurse Julie on March 25, 2022, 05:22:32 PM ---I suppose in theory, even though oil is observed getting up to the cam on a newly rebuilt engine at initial start up, it could take a few miles of riding to dislodge any debris that is in the bottom end, such as the dreaded silicone sealer, blobs of glass bead etc, etc.
--- End quote ---
Julie I reckon you're spot on and this is what happened. I'd been pretty surgically clean and really tried to make sure all oil routes were clear but I guess something somewhere blocked a jet and gave me the two fingers!!
So painful to fall on the last hurdle like this after a couple of years but I guess I'd be looking at ANOTHER tear down of the head etc anyway even if I'd discovered the oil blockage before meltdown. Just this is now even more of a costly one for parts and it now not going anywhere (will cancel my insurance on it now as it's just started) and almost beyond me putting anymore into it, moan moan f@#k s@*t
--- End quote ---
If when you strip the cam towers off and the oil jet is not blocked then, you have to look at the oilways in the towers. A lot of owners forget to check the oilways in the towers. When you find out what caused the problem and rebuild, when you start the engine do so, with the tappet covers off. This way you can see if oil is feeding the cam ;)
You have not said, if the engine was media blast cleaned.
Lobo:
This thread is of great interest to me as I am planning to imminently have ‘my bits’ hydro-blasted.
I’m spending a fair few of my days with an engine builder, who cautions me of 90 degree corners within oil ways, and that when wet blasting, media sludge can remain in such areas, and if not washed out whilst wet will harden and become difficult to shift later. It is basically hidden, and can be a cause of grief such as this.
So, I’ve been advised to ensure only the finest glass media is used, and that on removal from the cabinet the component is tho thoroughly flushed whilst wet. I honestly can’t say it makes me happier…. keen to hear advices.
Awful news Nick, we’ll all be keen to hear the source of the issue.
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