SOHC.co.uk Forums > CB350/400
400 Four strip down.
GregShiv:
--- Quote from: royhall on December 05, 2017, 07:44:23 AM ---That barrel has a few broken fins that will need repair. Sure sign that the heads been screwdriver prised off at some point.
--- End quote ---
I think I have counted 3 fins that are broken.
What is the best way to get them repaired, TIG build up?
GregShiv:
--- Quote from: K2-K6 on December 05, 2017, 12:09:15 PM ---As Julie has posted, those cam main journals look to be showing wear characteristics.
In addition, they show a pattern of wear symptomatic of metal embedded into the softer aluminium head bearings. If you can feel any "spikes " in the head bearings by running your fingernail round them, then that would indicate that they'd need to be corrected somehow before reassembly.
It's something you'd associate with the oil filter pressure release valve being operated so that contaminated oil is passed round the engine.
If that's the case, you may see the same type of marks when you get to the crank bearings also as they get the oil first.
--- End quote ---
There is a spike in one of the head bearings, apparently the bottom end was rebuilt 20 years ago and had a new primary chain fitted.
But it looks like the cam chain tensioner has been fitted to the wrong hole, I wonder what sort of damage that could potentially have caused?
GregShiv:
Update on engine strip.
I have taken the head off but the block is reluctant to even move, wooden mallet did not help.
Any suggestion as to the best way to get the block off without further damage to the aluminium?
GregShiv:
More pictures.
Why does one of the pistons have a 4 moulded into the top?
The pistons don't look too bad and the condition of the valves from my untrained eye look ok.
Initial look at the bores seem ok.
What are the opinion of the group?
GregShiv:
The frame and all black metal bits are at the powder coaters, the frame is just going to get "shot" blasted so that I can get the rust holes on the frame assessed and repaired.
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